Coagulation and flocculation are water treatment processes used to remove suspended particles from water. Suspended particles have a negative charge that causes them to repel each other, so coagulants with an opposite charge are added to neutralize this and allow particles to stick together. Coagulation involves rapid mixing to disperse coagulants while flocculation involves gentle mixing to encourage particle collisions and growth of flocs. Incomplete coagulation or flocculation will negatively impact downstream sedimentation and filtration steps. The choice of coagulant depends on factors like the particles to be removed and water chemistry. Common coagulants include inorganic salts like alum and polymers.
Determination of hardness and alkalinity of waste waterAakash Deep
This power point presentation illustrates the principles and methods of estimation of hardness and alkalinity of waste water.
I have included the principle, titration method, formulas and some sample problems based on them.
Concerned with the coagulation-flocculation-settling removal of colloidal and suspended solids.
Coagulation and flocculation is explained, and coagulating and flocculating agents and their functioning is described.
Design of different units including the clari-flocculator associated with the coagulation-flocculation-settling process is described.
Conducting a settling column test, plotting settling profile graph and using the settling profile graph in the design of a clarifier is described.
Determination of hardness and alkalinity of waste waterAakash Deep
This power point presentation illustrates the principles and methods of estimation of hardness and alkalinity of waste water.
I have included the principle, titration method, formulas and some sample problems based on them.
Concerned with the coagulation-flocculation-settling removal of colloidal and suspended solids.
Coagulation and flocculation is explained, and coagulating and flocculating agents and their functioning is described.
Design of different units including the clari-flocculator associated with the coagulation-flocculation-settling process is described.
Conducting a settling column test, plotting settling profile graph and using the settling profile graph in the design of a clarifier is described.
Students enrolled in the Microbiology course (BIOL223) at The College of the Holy Cross are required to complete a final project in which they create their own media and enrich for bacteria from two different genera, one of moderate difficulty and another of advanced difficulty. For my project, I enriched for members of the genus Alteromonas (moderate) and of the genus Methylobacterium (advanced).
Deals with rapid gravity filtration, slow sand filtration and Roughing filters.
Aspects covered include
Filter media and their characterization is described.
Filter running and filter backwashing,
Filter hydraulics.
Suspended solids, turbidity and bacterial removal from water.
Colloidal and Particulate Fouling ,The source of silt or colloids in reverse osmosis feed waters often includes : bacteria, clay , colloidal silica, iron corrosion products .
Methods to prevent colloidal fouling: Media Filtration ,Oxidation–Filtration ,Coagulation-Flocculation ,Microfiltration/Ultrafiltration
,Cartridge Microfiltration ,Antifoulants
1、What is ferric sulphate used for?
ferric sulphate is used in various fields such as dentistry and dermatology. It is thought to stop bleeding by chemically interacting with certain proteins in the blood. Other applications include odorants, solid separators, and water treatment chemicals.
2、what is ferric sulfate used for in water treatment?
Ferric sulfate acts as a coagulant and chemical reaction. Like alum, ferrous sulfate requires alkalinity in water to form the lambda particle iron hydroxide [Fe(OH)3]. When natural alkalinity is insufficient, alkaline chemicals (e.g. soluble salts containing CO-2, OH- ions) should be added.
This content is benificial for the research and development purposes. Students and research scholars who they are eager to search for the conventional waste water treatment methods are look here.
WATER & WASTE WATER ENGINEERING - water treatment process & unitsEddy Ankit Gangani
This presentation is made with a view to introduce various units & processes carried out in water treatment plant with various trains or say chains of units to meet Indian Standard criteria.
With rising crude prices and depleting quality of crude, however, the level of wastewater pollutants in petroleum wastewater is at new high. Such conditions are forcing refineries to use a more advanced water treatment, water recovery methods, and robust processes that work well under a variety of conditions and can handle the changing refinery effluent flow rates. Finally a process that is economical in overall life time cost is needed to make all of this feasible. Aquatech has experience working with these refinery effluent pollutants in the refinery market and offers the advanced petroleum wastewater treatment and recovery technology necessary for the refinery’s needs.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
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.
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.
Le nuove frontiere dell'AI nell'RPA con UiPath Autopilot™UiPathCommunity
In questo evento online gratuito, organizzato dalla Community Italiana di UiPath, potrai esplorare le nuove funzionalità di Autopilot, il tool che integra l'Intelligenza Artificiale nei processi di sviluppo e utilizzo delle Automazioni.
📕 Vedremo insieme alcuni esempi dell'utilizzo di Autopilot in diversi tool della Suite UiPath:
Autopilot per Studio Web
Autopilot per Studio
Autopilot per Apps
Clipboard AI
GenAI applicata alla Document Understanding
👨🏫👨💻 Speakers:
Stefano Negro, UiPath MVPx3, RPA Tech Lead @ BSP Consultant
Flavio Martinelli, UiPath MVP 2023, Technical Account Manager @UiPath
Andrei Tasca, RPA Solutions Team Lead @NTT Data
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
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
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Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
Quantum Computing: Current Landscape and the Future Role of APIs
Chapter12 coagulation
1. Coagulation and Flocculation
Groundwater and surface water contain both dissolved and suspended particles. Coagulation and
flocculation are used to separate the suspended solids portion from the water.
Suspended particles vary in source, charge, particle size, shape, and density. Correct application
of coagulation and flocculation depends upon these factors. Suspended solids in water have a
negative charge and since they have the same type of surface charge, they repel each other when
they come close together. Therefore, suspended solids will remain in suspension and will not
clump together and settle out of the water, unless proper coagulation and flocculation is used.
Coagulation and flocculation occurs in successive steps, allowing particle collision and growth
of floc. This is then followed by sedimentation (see Sedimentation Chapter). If coagulation is
incomplete, flocculation step will be unsuccessful, and if flocculation is incomplete,
sedimentation will be unsuccessful.
COAGULATION
Coagulant chemicals with charges opposite those of the suspended solids are added to the water
to neutralize the negative charges on non-settlable solids (such as clay and color-producing
organic substances).
Once the charge is neutralized, the small suspended particles are capable of sticking together.
These slightly larger particles are called microflocs, and are not visible to the naked eye. Water
surrounding the newly formed microflocs should be clear. If not, coagulation and some of the
particles charge have not been neutralized. More coagulant chemicals may need to be added.
A high-energy, rapid-mix to properly disperse coagulant and promote particle collisions is
needed to achieve good coagulation. Over-mixing does not affect coagulation, but insufficient
mixing will leave this step incomplete. Contact time in the rapid-mix chamber is typically 1 to 3
minutes.
Coagulation and Flocculation Process Fundamentals 1
2. FLOCCULATION
Flocculation, a gentle mixing stage, increases the particle size from submicroscopic microfloc to
visible suspended particles. Microfloc particles collide, causing them to bond to produce larger,
visible flocs called pinflocs. Floc size continues to build with additional collisions and
interaction with added inorganic polymers (coagulant) or organic polymers. Macroflocs are
formed and high molecular weight polymers, called coagulant aids, may be added to help bridge,
bind, and strengthen the floc, add weight, and increase settling rate. Once floc has reached it
optimum size and strength, water is ready for sedimentation.
Design contact times for flocculation range from 15 or 20 minutes to an hour or more, and
flocculation requires careful attention to the mixing velocity and amount of mix energy. To
prevent floc from tearing apart or shearing, the mixing velocity and energy are usually tapered
off as the size of floc increases. Once flocs are torn apart, it is difficult to get them to reform to
their optimum size and strength. The amount of operator control available in flocculation is
highly dependent upon the type and design of the equipment.
Coagulation and Flocculation Process Fundamentals 2
3. CONVENTIONAL PLANTS
Conventional plants separate coagulation (or rapid-mix) stage from flocculation (or slow-mix)
stage. These stages are followed by sedimentation, and then filtration. Plants designed for direct
filtration route water directly from flocculation to filtration. These systems typically have a
higher raw-water quality. Conventional plants can have adjustable mixing speeds in both the
rapid-mix and slow-mix equipment. Multiple feed points for coagulants, polymers, flocculants,
and other chemicals can be provided and there is generally enough space to separate the feed
points for incompatible chemicals.
Conventional plants have conservative retention times and rise rates. This usually results in
requirements for large process basins and a large amount of land for the plant site. On-site pilot
plant evaluation, by a qualified engineer familiar with the water quality, is recommended prior to
design.
Coagulation and Flocculation Process Fundamentals 3
4. Retention (or detention) time is the amount of time that water spends in a process. It is calculated
by dividing the liquid volume (in gallons) of a basin by the plant flow rate (gallons per minute).
Actual detention time in a basin will be less than the calculated detention time because of “dead
areas” and short circuiting, which could be due to inadequate baffling.
Retention time = basin volume (gallons)
gpm flow
Rise rate is calculated by dividing the flow in gallons per minute by the net water surface area of
the basin in square feet.
Rise Rate = gpm flow
surface area
COAGULATION, FLOCCULATION, AND SEDIMENTATION COMBINED
Some designs incorporate coagulation, flocculation, and sedimentation a single unit (either
upflow solids contact units or sludge blanket units). Most upflow solids contact units use
recirculation of previously formed floes to enhance floc formation and maximize usage of
treatment chemicals. Sludge blanket units force newly forming flocs to pass upward through a
suspended bed of floc.
In both styles of units, the cross-sectional surface of the basin increases from bottom to top,
causing water flow to slow as it rises, and allowing floc to settle out. Combination units
generally use higher rise rates and shorter detention time than conventional treatment. Numerous
manufacturers market proprietary units based on these design concepts. These units are more
compact and require less land for plant site location. On-site pilot plant evaluation, by a qualified
engineer familiar with the water quality, is recommended prior to design.
Coagulation and Flocculation Process Fundamentals 4
5. COAGULANT SELECTION
The choice of coagulant chemical depends upon the type of suspended solid to be removed, raw
water conditions, facility design, and cost of chemical. Final selection of coagulant (or
coagulants) should be made with jar testing and plant scale evaluation. Consideration must be
given to required effluent quality, effect upon down stream treatment process performance, cost,
method and cost of sludge handling and disposal, and cost of the dose required for effective
treatment.
Inorganic Coagulants
Inorganic coagulants such as aluminum and iron salts are the most commonly used. When added
to water, these highly charged ions to neutralize the suspended particles. The inorganic
hydroxides that are formed produce short polymer chains which enhance microfloc formation.
Inorganic coagulants usually offer the lowest price per pound, are widely available, and, when
properly applied, are effective in removing most suspended solids. They are also capable of
removing a portion of the organic precursors which may combine with chlorine to form
disinfection by-products. Inorganic coagulants produce large volumes of floc which can also
entrap bacteria as they settle.
Inorganic coagulants may alter the pH of the water since they consume alkalinity. When applied
in a lime soda ash softening process, alum and iron salts generate demand for lime and soda ash.
They also require corrosion-resistant storage and feed equipment. It is important to note that
large volumes of settled floc must be disposed of in an environmentally acceptable manner.
Alum, ferric sulfate, and ferric chloride, lower the alkalinity, and pH reactions for each follow:
Coagulation and Flocculation Process Fundamentals 5
6. Alum
A12(SO4)3 + 3 Ca(HCO3)2 ------------ > 2 Al(OH)3 + 3CaSO4 + 6 CO2
Aluminum + Calcium gives Aluminum + Calcium + Carbon
Sulfate Bicarbonate Hydroxide Sulfate Dioxide
(present in the water to treat)
Ferric Sulfate
Fe2(SO4)3 + 3 Ca(HCO3)2 ------------ > 2 Fe(OH)3 + 3CaSO4 + 6 CO2
Ferric + Calcium gives Ferric + Calcium + Carbon
Sulfate Bicarbonate Hydroxide Sulfate Dioxide
(present in the water to treat)
Ferric Chloride
2 Fe Cl3 + 3 Ca(HCO3)2 ------------ > 2 Fe(OH)3 + 3CaCl2 + 6CO2
Ferric + Calcium gives Ferric + Calcium + Carbon
Chloride Bicarbonate Hydroxide Chloride Dioxide
(present in the water to treat)
Polymers
Polymers (long-chained, high-molecular-weight, organic chemicals) are becoming more widely
used. These can be used as coagulant aids along with the regular inorganic coagulants. Anionic
(negatively charged) polymers are often used with metal coagulants. Low-to-medium weight
cationic (positively charged) polymers may be used alone, or in combination with alumor ferric
coagulants to attract suspended solids and neutralize their surface charge. Manufacturers can
produce a wide range of polymers that meet a variety of source-water conditions by controlling
the amount and type of charge and the polymers molecular weight.
Polymers are effective over a wider pH range than inorganic coagulants. They can be applied at
lower doses, and do not consume alkalinity. They produce smaller volumes of more
concentrated, rapidly settling floc. Floc formed from use of a properly selected polymer will be
more resistant to shear, resulting in less carryover and a cleaner effluent.
Polymers are generally several times more expensive in price per pound than inorganic
coagulants. Selection of the proper polymer requires considerable jar testing under simulated
plant conditions, followed by pilot or plant-scale trials. All polymers must also be approved for
potable water use by regulatory agencies.
Coagulation and Flocculation Process Fundamentals 6