The document discusses sewage disinfection and the wastewater treatment process. It explains that the goal of wastewater treatment is to provide water free from pathogens, but primary, secondary, and tertiary treatment cannot remove 100% of waste and pathogens. Disinfection is needed to destroy remaining pathogens. The two main disinfection methods are physical (e.g. heating) and chemical (e.g. chlorination, ozonation). Chlorine is widely used for disinfection due to its availability, low cost, and ability to provide residuals that protect distribution systems. However, chlorine reactions can form harmful byproducts like trihalomethanes. Factors like water quality, temperature, pH, and contact time
Chlorination is the process of adding the element chlorine to water as a method of water purification to make it fit for human consumption as drinking water.
I hope You all like it. I hope It is very beneficial for you all. I really thought that you all get enough knowledge from this presentation. This presentation is about materials and their classifications. After you read this presentation you knowledge is not as before.
Chlorination is the process of adding the element chlorine to water as a method of water purification to make it fit for human consumption as drinking water.
I hope You all like it. I hope It is very beneficial for you all. I really thought that you all get enough knowledge from this presentation. This presentation is about materials and their classifications. After you read this presentation you knowledge is not as before.
filtration of water treatment. types of filters and filtration. slow sand filter. environmental engineering-1. water treatment methods. filtration of raw water. design and construction of slow sand filters. cleaning of slow sand filters. slow sand filters were explained. about rapid sand filters and pressure filters will be explained in next publication.
in the study of the breakpoints chlorination. what is the chlorine break point and how it is measures etc are questions is started in your mind. but in this slide we discussing about that questions.the advantages and disadvantages of the breackpoint clorination is very important.
Rapid sand filtration is a technique common in developed countries for treating large quantities of drinking water. It is a relatively sophisticated process usually requiring power-operated pumps for backwashing or cleaning the filter bed, and flow control of the filter outlet. A continuously operating filter will usually require backwashing about every two days when raw water of relatively low turbidity is used.
disinfection, method of disinfection, form in which chlorine can be applied, requirement of good disinfectant , chlorine chemistry, effect of ph , temperature , contact time in chlorination, germicidal efficiency of chlorine, by products during chlorination.
Water purification methods are very necessary at industrial level. Its also necessary to purify water for drinking purpose and its use in agricultural areas.
THESE SLIDES ARE PREPAREED TO UNDERSTAND about ENVIRONMENTAL HEALTH PROBLEMS IN INDIA IN EASY WAY Important links- NOTES- https://mynursingstudents.blogspot.com/ youtube channel https://www.youtube.com/c/MYSTUDENTSU... CHANEL PLAYLIST- ANATOMY AND PHYSIOLOGY-https://www.youtube.com/playlist?list=PL93S13oM2gAPM3VTGVUXIeswKJ3XGaD2p COMMUNITY HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPyslPNdIJoVjiXEDTVEDzs CHILD HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gANcslmv0DXg6BWmWN359Gvg FIRST AID- https://www.youtube.com/playlist?list=PL93S13oM2gAMvGqeqH2ZTklzFAZhOrvgP HCM- https://www.youtube.com/playlist?list=PL93S13oM2gAM7mZ1vZhQBHWbdLnLb-cH9 FUNDAMENTALS OF NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPFxu78NDLpGPaxEmK1fTao COMMUNICABLE DISEASES- https://www.youtube.com/playlist?list=PL93S13oM2gAOWo4IwNjLU_LCuhRN0ZLeb ENVIRONMENTAL HEALTH- https://www.youtube.com/playlist?list=PL93S13oM2gAPkI6LvfS8Zu1nm6mZi9FK6 MSN- https://www.youtube.com/playlist?list=PL93S13oM2gAOdyoHnDLAoR_o8M6ccqYBm HINDI ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAN4L-FJ3s_IEXgZCijGUA1A ENGLISH ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAMYv2a1hFcq4W1nBjTnRkHP facebook profile- https://www.facebook.com/suresh.kr.lrhs/ FACEBOOK PAGE- https://www.facebook.com/My-Student-S... facebook group NURSING NOTES- https://www.facebook.com/groups/24139... FOR MAKING EASY NOTES YOU CAN ALSO VISIT MY BLOG – BLOGGER- https://mynursingstudents.blogspot.com/ Instagram- https://www.instagram.com/mystudentsu... Twitter- https://twitter.com/student_system?s=08 #PEM, #water,#waterborne,#ICDS,#diseases,#ASSESSMENT, #APPEARENCE,#PULSE,#GRIMACE,#REFLEX,#RESPIRATION,#RESUSCITATION,#NEWBORN,#BABY,#VIRGINIA, #CHILD, #OXYGEN,#CYANOSIS,#OPTICNERVE, #SARACHNA,#MYSTUDENTSUPPORTSYSTEM, #rashes,#nursingclasses, #communityhealthnursing,#ANM, #GNM, #BSCNURING,#NURSINGSTUDENTS, #WHO,#NURSINGINSTITUTION,#COLLEGEOFNURSING,#nursingofficer,#COMMUNITYHEALTHOFFICE,#HEALTHPROBLEMS
Raw water should be treated to make it potable/fit for drinking. So a line of treatments should be followed to treat the water. After Coagulation and sedimentation the process of filtration and disinfection are followed.
It deals with biological water quality improvement through disinfection, disinfectants and disinfection kinetics, chlorine and other commonly used disinfectants, breakpoint chlorination and chlorination system
filtration of water treatment. types of filters and filtration. slow sand filter. environmental engineering-1. water treatment methods. filtration of raw water. design and construction of slow sand filters. cleaning of slow sand filters. slow sand filters were explained. about rapid sand filters and pressure filters will be explained in next publication.
in the study of the breakpoints chlorination. what is the chlorine break point and how it is measures etc are questions is started in your mind. but in this slide we discussing about that questions.the advantages and disadvantages of the breackpoint clorination is very important.
Rapid sand filtration is a technique common in developed countries for treating large quantities of drinking water. It is a relatively sophisticated process usually requiring power-operated pumps for backwashing or cleaning the filter bed, and flow control of the filter outlet. A continuously operating filter will usually require backwashing about every two days when raw water of relatively low turbidity is used.
disinfection, method of disinfection, form in which chlorine can be applied, requirement of good disinfectant , chlorine chemistry, effect of ph , temperature , contact time in chlorination, germicidal efficiency of chlorine, by products during chlorination.
Water purification methods are very necessary at industrial level. Its also necessary to purify water for drinking purpose and its use in agricultural areas.
THESE SLIDES ARE PREPAREED TO UNDERSTAND about ENVIRONMENTAL HEALTH PROBLEMS IN INDIA IN EASY WAY Important links- NOTES- https://mynursingstudents.blogspot.com/ youtube channel https://www.youtube.com/c/MYSTUDENTSU... CHANEL PLAYLIST- ANATOMY AND PHYSIOLOGY-https://www.youtube.com/playlist?list=PL93S13oM2gAPM3VTGVUXIeswKJ3XGaD2p COMMUNITY HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPyslPNdIJoVjiXEDTVEDzs CHILD HEALTH NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gANcslmv0DXg6BWmWN359Gvg FIRST AID- https://www.youtube.com/playlist?list=PL93S13oM2gAMvGqeqH2ZTklzFAZhOrvgP HCM- https://www.youtube.com/playlist?list=PL93S13oM2gAM7mZ1vZhQBHWbdLnLb-cH9 FUNDAMENTALS OF NURSING- https://www.youtube.com/playlist?list=PL93S13oM2gAPFxu78NDLpGPaxEmK1fTao COMMUNICABLE DISEASES- https://www.youtube.com/playlist?list=PL93S13oM2gAOWo4IwNjLU_LCuhRN0ZLeb ENVIRONMENTAL HEALTH- https://www.youtube.com/playlist?list=PL93S13oM2gAPkI6LvfS8Zu1nm6mZi9FK6 MSN- https://www.youtube.com/playlist?list=PL93S13oM2gAOdyoHnDLAoR_o8M6ccqYBm HINDI ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAN4L-FJ3s_IEXgZCijGUA1A ENGLISH ONLY- https://www.youtube.com/playlist?list=PL93S13oM2gAMYv2a1hFcq4W1nBjTnRkHP facebook profile- https://www.facebook.com/suresh.kr.lrhs/ FACEBOOK PAGE- https://www.facebook.com/My-Student-S... facebook group NURSING NOTES- https://www.facebook.com/groups/24139... FOR MAKING EASY NOTES YOU CAN ALSO VISIT MY BLOG – BLOGGER- https://mynursingstudents.blogspot.com/ Instagram- https://www.instagram.com/mystudentsu... Twitter- https://twitter.com/student_system?s=08 #PEM, #water,#waterborne,#ICDS,#diseases,#ASSESSMENT, #APPEARENCE,#PULSE,#GRIMACE,#REFLEX,#RESPIRATION,#RESUSCITATION,#NEWBORN,#BABY,#VIRGINIA, #CHILD, #OXYGEN,#CYANOSIS,#OPTICNERVE, #SARACHNA,#MYSTUDENTSUPPORTSYSTEM, #rashes,#nursingclasses, #communityhealthnursing,#ANM, #GNM, #BSCNURING,#NURSINGSTUDENTS, #WHO,#NURSINGINSTITUTION,#COLLEGEOFNURSING,#nursingofficer,#COMMUNITYHEALTHOFFICE,#HEALTHPROBLEMS
Raw water should be treated to make it potable/fit for drinking. So a line of treatments should be followed to treat the water. After Coagulation and sedimentation the process of filtration and disinfection are followed.
It deals with biological water quality improvement through disinfection, disinfectants and disinfection kinetics, chlorine and other commonly used disinfectants, breakpoint chlorination and chlorination system
water supply engineering, raw water treatment, disinfection, sterilization, killing of micro organism, chlorination, break point chlorination, ozonization, Ultraviolet rays, Iodine and Bromine
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment. Water treatment removes contaminants and undesirable components, or reduces their concentration so that the water becomes fit for its desired end-use. This treatment is crucial to human health and allows humans to benefit from both drinking and irrigation use.
Similar to Disinfection chlorination chlorination derived by products (20)
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
2.
The ultimate aim of waste water treatment process
or drinking water purification process is to
provide water which is free from any pathogenic
microorganism
Primary, secondary even tertiary treatment cannot
be expected to remove 100 percent of the incoming
waste load and many microorganisms still remain
in waste water stream.
Disinfection is carried out to destroy pathogenic
microorganism in waste water that may remain in
waste water even after primary,secondary and
tertiary treatment.
3. Sewage disinfection is defined as process of
destroying pathogenic microorganisms in the
waste water stream by physical or chemical
treatment.
The main aim of sewage disinfection is to
prevent spread of diseases
protect potable water supplies ,bathing
beaches ,shellfish growing areas etc…..
4.
1.
2.
3.
4.
5.
6.
7.
Disinfection process is affected by various
factors:
The nature of water to be disinfected.
The temperature of water to be disinfected.
The Ph is either acidity or alkalinity of the
water.
The nature and number of organisms to be
destroyed.
The type and concentration of the disinfectant
employed.
Mixing of water and the disinfectant.
The time of contact.
5.
Disinfection can be done by two methods:
Physical Methods
heating to boiling
incineration
irradiation with X-rays or UV rays
Chemical Methods
Chlorination
Ozonation
6.
UV light is an electromagnetic radiation with a
wavelength of approximately 200-400 nm.
It has been used since the early 1900s in Europe
for the disinfection of municipal water
supplies.
A major reason for this is that UV adds nothing
to waste water during disinfection process.
UV light disinfects by altering the DNA of the
bacterial cells that are exposed.
7.
In waste water treatment plants,UV light is
produced by low pressure mercury lamps.
These lamps ,which provide radiation of 253.7
nm ,are usually housed in specially fused
quartz sleeves(acts as electrical insulator & as
temperature buffer).
For the UV disinfection process to be effective
,the UV radiation must be directed on the
bacteria.
To achieve disinfection ,most bacteria require
6000-13000 microwatt per seconds of exposure.
8. 1.
2.
3.
High cost of operation.
Anything that can prevent the UV from
reaching the bacteria will prevent an effective
kill.
UV light tends to ionize compounds and break
them apart.
9. REQUERMENTS OF A GOOD CHEMICAL
DISINFECTANT ARE:
1.
Should quick and effective in killing pathogenic
microorganisms present in the water.
2.
Should be readily soluble in water at concentration
required for disinfection and it should also leave a
residual effect.
3.
Should not impart any taste ,odor or color to water.
4.
Should not be toxic to human and animal life.
5.
Should be easy to detect and measure in water.
6.
Should be easy to handle, transport, apply and control.
7.
Should be readily available at moderate cost.
10. Of all chemicals agents chlorine is widely used
as disinfectant.
ADVANTAGES
It is readily available as gas ,liquid or powder.
It is cheap.
It is easy to apply due to relatively highly
solubility(7000mg/litre).
It leaves a residual in solution ,which while not
harmful to man, provides protection in the
distribution system.
It is toxic to most microorganisms ,interfering
with metabolic activities.
It also plays an important role in the treatment
of cyanide wastes which are highly toxic.
11.
Disinfection of water with chlorine is generally
refered to as chlorination.
Chlorine was first used as a disinfectant around
1800 A.D. by de Morveau in France and by
Cruikshank in England.
The primary use of chlorine in sewage disposal
system was for odor control , hydrogen sulphide
destruction and prevention of septicity.
Although chlorine is a strong oxidising agent its
toxicity against microorganisms is not due to its
oxidation effect.
Actually chlorine interferes with vital enzymes of
microorganisms and this brings out their death.
12.
Chlorine when added to water undergoes various
reactions with water and other constituents in
water.
The first important reaction is the formation of
hypochlorous acid (HOCl).
HOCl is acid is a weak acid and often dissociates
to H+and OCl‾ ions.
The extent of dissociation actually depends on the
ph.
The preferred ph for disinfection with chlorine is
6.7.
In the presence of ammonia in water
,hypochlorous acid reacts with ammonium ion and
successively gives monochloramine ,dichloramine
,trichloramine.
13.
The chloramines ,along with other chlorine
compounds are referred to as combined
chlorine residuals or combined available
chlorine.
Chlorine ,hypochlorous acid and chlorite ion
are collectively referred to as free chlorine
residuals or free available chlorine.
14. BREAKPOINT CHLORINATION
If the water to be chlorinated contains
significant amounts of ammonia the amount of
chlorine added will be sufficient only to form
monochloramine.
Further addition of chlorine may lead to
formation of di-or tri-chloramines.
But their formation can be prevented by
maintaining the chlorine to nitrogen ratio very
low.
15.
Mixtures of mono and di-chloramines are
usually unstable.
Tri-chloramine is also unstable in presence of
mono-chloramine.
At this stage further addition of chlorine causes
a break down of chloramines.
Thus a break point is reached where no
ammonia or mono-chloramine is left in the
solution and no free available chlorine is
present.
Further addition of chlorine produces free
available chlorine in water .
Adding chlorine to exceed the breakpoint is
called breakpoint chlorination.
16. SUPER CHLORINATION
Sometimes the quality of raw water may be
uncertain and may be cases where the presence
of resistant microorganisms may be suspected.
In these cases addition of chlorine in excess
amounts may be required for a given period of
contact time.This type of chlorination is
referred to as super chlorination.
17. CHLORAMINATION
In certain cases presence of combined available
chlorine may be desirable over that of free
available chlorine in spite of their low
disinfective capacity.
For eg. Chloramination of water rich in organic
matter may give undesirable odor .
But chloramines are reactive towards organic
matter , thus in this case chloramines are
preferred over hypochlorous acid.
In chloramination formation of
monochloramine is favoured by the addition of
chlorine along with ammonia to water.
18. CHLORINE DIOXIDE
Chlorine dioxide is treated as a separate
disinfectant since it is not formed by the direct
addition of chlorine to water.
Also it is not a product from the reaction of
chlorine with any compound in water.
Chlorine dioxide can be generated by adding
either chlorine or hydrochloric acid in sodium
chlorite.
Chlorine dioxide is a more powerful disinfectant
than chlorine in alkaline conditions.
It does not combine with ammonia and hence can
be used to obtain free chlorine residuals even in
waters with high ammonium content.
The disadvantage is it is much more expensive.
19.
The amount of chlorine used up by organic
and inorganic reducing substances is defined
as chlorine demand.
Chlorine demand =
Applied chlorine dose-chlorine residual
Disinfection is carried out by that amount of
chlorine remaining after the chlorine demand
has satisfied.
This quantity is defined as residual chlorine
and expressed as mg per litre.
20. 1.
It is a toxic gas and need careful handling.
1.
It can cause taste and odor problems especially
in the presence of phenols.
21.
By-products created from the reactions
between inorganic compounds and chlorine are
harmless and can be easily removed by
filtration.
Other by-products such as chloramine are
beneficial to disinfection process.
Other by-products are:
TRIHALOMETHANES
Formed by reaction between chlorine and
organic material such as humic acid and fulvic
acid to create haloginated organics.
22.
Trihalomethanes are carcinogenic.
The trihalomethane of most concern is
chloroform.
Chronic exposure may cause damage to liver and
kidneys.
TRICHLOROACETIC ACID
Produced commercially for use as a herbicide and
is also produced in drinking water.
DICHLOROACETIC ACID
It is an irritant ,corrosive and destructive against
mucous membrane.
HALOACETONITRILES
Used as pesticide in the past ,but no longer
manufactured.
23.
They are produced as a result of reaction
between chlorine ,natural organic matter and
bromide.
CHLOROPHENOLS
Cause taste and odor problems.
They are toxic when present in higher
concentrations.
Affect the respiration and energy storage
process in the body.