What is the definition of wastewater?

Wastewater is the water that remains after humans have used fresh water for domestic, commercial, or industrial purposes.

Only wastewater generated by home use will be addressed in this blog!

Fresh water is mostly used for a range of home purposes such as washing, bathing, and flushing toilets. Washing entails cleaning cooking utensils, washing vegetables and other foods, bathing, washing hands, and washing clothes.

Vegetable matter, oils used in cooking, oil in hair, detergents, filth from scrubbed floors, soap used in bathing, and oils/greases rinsed from the human body are all found in the water that emerges following these uses.

Grey water, often known as sullage, is the name given to this water. The water used to flush toilets to remove human waste is referred to as "Black Water" or "Sewage."

Grey water, as opposed to black water, or sewage, is easier to filter. However, in India, it is common practise to mix these two wastes and discharge them into a public sewer or a sewage treatment plant in a residential neighbourhood or building that does not have access to a public sewer.

In a residential complex, how much wastewater is generated?

The amount of water utilised by residents in a housing complex without access to an underground sewerage/drainage system is estimated to be 135 Lpcd. The total volume (number of occupants x 135 litres) is discharged into a sewage treatment plant (STP) on the grounds, which must treat the entire volume.

The actual waste generated far surpasses this figure in the great majority of cases, causing the STP to become overcrowded. This occurs frequently because practically all residential complexes and gated communities do not install water metres or other water volume and flow metering equipment’s to keep track of water consumption.

What is the difference between "aerobic" and "anaerobic" sewage treatment process?

The aerobic process, is one in which the microorganisms that clean up the sewage require air (oxygen) to function and reproduce in order to 'clean up' the sewage. An anaerobic process is one in which a different type of bacteria is used. It is a bacteria or microbe that does not require air and can survive in an airless environment (thus the word "anaerobic"). This type of bacteria creates methane and is referred to as "methanogens" in the waste/environmental engineering business.

The aerobic process is frequently followed by anaerobic treatment, and this combination is used when the wastewater has extremely high BOD and COD levels. In such cases, the anaerobic system reduces BOD and COD to the point where the aerobic process can finish the job of decreasing them to the point where a tertiary treatment step may polish the treated sewage.

How can sewage that has been treated be reused or recycled?

This demands the construction of piping on the rooftops of any home or commercial structure to supply two sets of storage tanks. Fresh water will be delivered and kept in a single set of storage tanks before being piped into bathrooms and kitchens for drinking, cooking, cleaning, and bathing. The water from the second set of tanks will be pumped to all of the toilet flush tanks and other sites where it can be utilised for washing yards, floors, and gardening.

What about the STP's operational costs?

The costs of operation, including maintenance-

STP of 75KLD capacity and above: 1.2 paise per litre of sewage treated.

STPs with a capacity of 50KLD or less: 1.5 paise per litre of sewage treated.

What does Netsol Water provide?

Netsol Water is a significant water and wastewater treatment firm in India, offering WTP, WWTP, STP, and ETP manufacture, among other services. The company creates equipment’s and is committed to providing practical solutions that help businesses flourish.

Flotation, coagulation, sedimentation, filtration, adsorption, membranes, initial settling, secondary activated sludge, anaerobic digestion, and even carbon dioxide or methane recovery for further uses are just a few of them. We are committed to providing our valued customers with hands-on service, expert counselling, and training.