Where does wastewater go
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The document summarizes the four main stages of wastewater treatment: preliminary, primary, secondary, and tertiary. It explains that preliminary treatment removes large debris, primary treatment removes 60% of solids through settling, secondary treatment removes up to 85% of solids using bacteria, and tertiary treatment converts ammonia into nitrogen gas to reduce algal blooms in Narragansett Bay where the treated water is released.
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Marine pollution is caused by human activities that introduce waste into the ocean directly or indirectly. Waste enters the ocean through pipes discharging municipal waste and sewage, agricultural runoff of pesticides and fertilizers, petroleum and oils washed from roads into waterways, offshore oil extraction and accidents that release toxic substances from ships. This pollution reduces oxygen levels in the water, releases toxic compounds, and harms marine life through effects like clogging gills or reducing birds' ability to regulate body temperature. Treatment plants can help by removing waste and reducing pollution load through primary, secondary, and advanced treatment methods.
CONVENTIONAL METHOD â WASTE WATER TREATMENT.pptx
Water is a precious resource and without it life is not possible on earth
Water is getting polluted day by day due to excessive and careless use so the percent of available drinking water is reducing
There are many ways which causes water pollution and the effects of it are very harmful for all living and non-living objects
In general, sewage contains dissolved solids, suspended solids, nutrients (N, P), sulphate, chloride and heavy metals (Fe, Cu, Co, Zn, Pb, Ni), bacteria and viruses.
This 0.1% contains organic matter, microorganisms and inorganic compounds.
Of the solids present in sewage, 70% are organic and 30% are inorganic in nature.
The organic fraction contains proteins (60%), carbohydrates (20%) and fats (10%).
The inorganic fraction contains grit, salts and metals.
The Sewage Treatment Process essentially includes three stages. What are the three stages of sewage treatment and How does each stage work?
The three stages can be divided into primary, secondary, and Tertiary. In each step, water is purified to the next level to access clean water for humans and the environment.
1.This stage essentially includes the process of sedimentation. The water is held in the large sedimentary or rainwater tanks where the settleable solids are removed. Since the sedimentation tanks work on the principle of gravity, the solids settle at the bottom, and the lighter solids float in the tanks. Anyhow, let's move forward to stage 2 of secondary treatment. After the sludge settles at the bottom, the water is then released for its secondary treatment.
2.In this process, waste is broken down by aerobic bacteria and incorporated into the wastewater system.Â
3. Tertiary treatment is also known as polishing and disinfecting the water with the highest standards. This stage is critical to producing the water to a particular specification such as technical water, mineral water etc. It is also used to treat the water in public systems.
1.the incoming wastewater passes through screening equipment where objects such as rags, wood fragments, plastics, and grease are removed. The material removed is washed and pressed and disposed of in a landfill. The screened wastewater is then pumped to the next step: grit removal.
2. In this step, heavy but fine material such as sand and gravel is removed from the wastewater. This material is also disposed of in a landfill.
3. The material, which will settle, but at a slower rate than step two, is taken out using large circular tanks called clarifiers. The settled material, called primary sludge, is pumped off the bottom and the wastewater exits the tank from the top. Floating debris such as grease is skimmed off the top and sent with the settled material to digesters.
4. In this step, the wastewater receives most of its treatment. Through biological degradation, the pollutants are consumed by microorganisms and transformed into cell tissue, water, and nitrogen.Â
5. Large circular tanks called secondary clarifiers
WASTEWATER engineering.pptx
This document summarizes wastewater treatment processes and evaluates the efficiency of wastewater methods in Cameroon using the case of Buea. It describes primary, secondary, and tertiary wastewater treatment processes. For Buea, it outlines the design of a semi-centralized wastewater treatment plant including grit removal, primary sedimentation, biofiltration, oxidation ponds, and disinfection. Analysis shows the plant meets national wastewater discharge standards through significant reductions in BOD, nitrogen, and phosphorus levels. The proposed system is preferred by local residents over autonomous systems and could help Cameroon improve wastewater management.
Water Purifier systems for drinking pure water.pptx
The ppt highlights the different stages, uses and purposes of having a water purifier for your home.
Water treatment
This document discusses various water treatment processes used in the pharmaceutical industry, including reverse osmosis (RO), demineralization (DM), and ultrafiltration. RO uses semipermeable membranes to remove dissolved solids, particles, and microorganisms from water. DM removes mineral salts using ion exchange resins. Ultrafiltration uses membranes to retain suspended solids and high molecular weight substances. The document also describes different types of treated water used in pharmaceutical applications, such as water for injection and sterile water, and their production processes.
Water treatment process by RO UF
This document discusses various water treatment processes used in the pharmaceutical industry, including reverse osmosis (RO), demineralization (DM), and ultrafiltration. RO uses semipermeable membranes to remove dissolved solids, organic pyrogens, and microbes from water. DM removes mineral salts using ion exchange resins. Ultrafiltration uses membranes to retain suspended solids and high molecular weight substances while allowing water and low molecular solutes to pass through. The document also describes different types of treated pharmaceutical water like water for injection and their uses.
Municipal wastewater treatment
This document provides an overview of the stages and processes involved in municipal wastewater treatment. It discusses the stages of screening, physical treatment including grit removal and aeration, chemical treatment through coagulation and flocculation, sedimentation, filtration, chlorination, and sometimes supplementary treatment like fluoridation. The goal of these treatment stages is to remove contaminants and produce clean water that is safe for human use and discharge back into the environment.
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Where does wastewater go
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- 2. Where does our wastewater go? DEM Office of Water Resources Narragansett Bay Commission
- 4. Stages of Wastewater Treatment Preliminary treatment removes large pieces of debris like trash and branches with bar racks. Smaller debris, such as gravel and coffee grounds, are separated using aerated grit tanks. The separated material is then taken to the landfill for proper disposal. Primary treatment removes smaller solids through settling tanks and skimming devices. At this point 60% of the solids are removed. Additionally at this step, chlorination of the water takes place. Secondary treatment removes up to 85% of the solid material in the wastewater. In this step the water is aerated to stimulate the growth of helpful bacteria and other microorganisms that break down organic nitrogen and impurities converting them into ammonia. After the sludge created by these microorganisms is separated from the wastewater, the water is chlorinated and then released into the Bay. Many treatment plants have upgraded to Tertiary treatment to comply with strict nitrogen limits. This step converts ammonia into N2 gas which is then released out of the system back into the atmosphere. Because ammonia is the easiest form of nitrogen for algae to utilize, it contributes most significantly to the explosion of microalgal blooms in the upper Bay. Source: STB
- 5. Stages of Treatment⌠Save The Bay The new CSO Tunnel -- video
- 6. Who shares the Bay?
- 11. Who else lives in the Bay? Oysters Clams Lobsters Starfish Fluke and flounder Who else depends on our Bay?
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