What is the process of wastewater treatment?
The Wastewater Treatment Process
- Stage One — Bar Screening.
- Stage Two — Screening.
- Stage Three — Primary Clarifier.
- Stage Four — Aeration.
- Stage Five — Secondary Clarifier.
- Stage Six — Chlorination (Disinfection)
- Stage Seven — Water Analysis & Testing.
- Stage Eight — Effluent Disposal.
What are the 3 main stages of wastewater treatment?
There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.
Which plants are used in wastewater treatment?
These include wetland plants, mosquito repellents and ornamental plants like cattails, bulrush, citronella, canna, hibiscus, fountain grass, flowering herbs, tulsi and ashwagandha. The plants absorb the high levels of phosphorus and nitrogen in the sewage water entering the lake.
What do wastewater treatment plants do?
A waste water treatment plant cleans sewage and water so that they can be returned to the environment. These plants remove solids and pollutants, break down organic matter and restore the oxygen content of treated water.
What is the process of STP plant?
Primary treatment In a sewage treatment plant, sewage water is first allowed to pass through screens or grit chamber where large solids are removed. This step is followed by aeration/mixing in a tank and then primary sedimentation where suspended solids settle down.
Why is wastewater treated with chlorine or UV light?
Unlike chemical approaches to water disinfection, UV provides rapid, effective inactivation of microorganisms through a physical process. The retention time required to achieve disinfection ranges from a few seconds compared to several (>30) minutes for chlorine disinfection.
Which bacteria is used in aeration tank?
With a normal influent load of pollutants, the dissolved oxygen content in the aerated section of most plants should be kept between 3 and 5 MG/L. Anaerobic bacteria are normally used in an anaerobic digester to reduce the volume of sludge to be disposed of and to produce methane gas.
Which plant cleans the water?
Proteins from the Moringa oleifera plant – a tree native to India – can help effectively purify water in developing nations at a low cost, say scientists. Proteins from the Moringa oleifera plant – a tree native to India – can help effectively purify water in developing nations at a low cost, say scientists.
What are the two main water treatment plants?
As previously seen above, sewage treatment plants provide initial treatment for domestic or municipal purposes. Effluent water treatment plants, on the other hand, are quite the opposite as they treat industrial effluent, that is, the wastewater that occurs as a result of the flow of byproducts from industries.
What are the development goals of sewerage in Sri Lanka?
・ｧ Waste from textile industry being discharged into inland surface waters, ・ｧ Waste being discharged from tanning industries, ・ｧ Discharge of wastewater effluents into public sewers with central WW treatment plants, Development Goals of Sewerage In Sri Lanka 10 Millennium Development Goals (MDG)
What is industrial wastewater?
・ｮIndustrial Wastewater -Dedicated Centralized sewer Systems comprising full treatment located within the industrial zones , the effluent discharged to Inland Inland water body or Central public WW collection system, water body or Central public WW collection system, 21 Major Issues Technical, Social, Environmental, Economical
What are the major cities in Sri Lanka?
MAJOR CITIES Population coverage by Piped Sewerage City Total Population Estim ated Population coverage Colombo city 715,000 435,615 Dehiwala / Mt. Lavinia 112,000 10,790 Kolonnawa 60,000 6,380 Kataragama 20,000 4,500 HOUSING SCHEMES Housing Scheme No. of Connections Population Covered