Wastewater treatment is usually broken down into two sections: primary treatment, which removes grease, dirt, gravel, and floatable waste, and secondary treatment, which removes even more suspended solids and pollutants by using biological processes.Sep 30, 2014,
In the primary stage, solids are allowed to settle and removed from wastewater. The secondary stage uses biological processes to further purify wastewater. Sometimes, these stages are combined into one operation.
(i) Inorganic impurities – nitrates, phosphates and metals. (ii) Organic impurities – fruit and vegetable wastes, oil, urea, human faeces, animal waste, pesticides and herbicides. 24. The terms sewage, sewers and sewerage are interlinked with each other.
The correct answer is Both biogas and sludge. Biogas and sludge are the products of wastewater treatment. The biogas forms due to the microbial degradation of the waste and sludge are the end by-product of the wastewater treatment.
There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.Dec 6, 2018
In primary treatment, sewage is stored in a basin where solids (sludge) can settle to the bottom and oil and lighter substances can rise to the top. These layers are then removed and then the remaining liquid can be sent to secondary treatment. Sewage sludge is treated in a separate process called sludge digestion.Jan 3, 2021
Types of sewage Domestic sewage carries used water from houses and apartments; it is also called sanitary sewage. Industrial sewage is used water from manufacturing or chemical processes. Storm sewage, or storm water, is runoff from precipitation that is collected in a system of pipes or open channels.
Treating sewage produces a lot of solid matter called 'sludge'. This has to be treated before we can recycle it to farmland. We use large tanks (known as digesters) where bacteria break the sludge down and release methane gas.
Sewage is disposed of in several ways, mainly two: removal in a waterborne sewer systems (sewerage) or disposed via an on-site sanitation system (pit latrines or septic tanks).