In India, it is estimated that a person disposes 135- 150 litres of water per day. Each person discharges 60 grams of waste into the water when involved in activities such as flushing the toilet, urination, defecation, hand washing, cooking, washing clothes, etc. There is also water being used in kitchen for washing utensils and food preparation. EcoTec sewage treatment systems, ESBR and EcoSBR treat household sewage wastewater. When treated, water can be sent to nature without harmful effects on environment and people. SBR process is reliable and is acknowledged by the Indian regulators and the Pollution control boards. SBR is considered as one of the few promising treatment systems for nutrient removal from sewage water.
Required quantity of sewage water from the collection tank is pumped into the aeration chamber also called SBR chamber/reactor for treatment. During this process air supply to the reactor is cut off so that there is no excessive oxygen available for micro-organisms. This creates an environment that favors the procreation of microorganisms with good settling characteristics. Aeration or denitrification follows this process.
Air is supplied in a time sequenced manner until the required amount of pollutants are removed from the sewage water. Denitrification in the start of the reaction aids the biological nutrient (Amminia Nitrogen NH4, Nitrates, Nitrites) removal. BOD and COD reduction is achieved by activated sludge process where, pollutants are consumed by activated Sludge. The MLSS in a SBR reactor varies, while the duration of aeration determines the BOD and COD reduction.
Activated sludge settles to the bottom when air supply is cut off, with a clear water zone appearing at the top. This clear water is ready to be taken out of the chamber. During sedimentation process, no aeration, filling or discharge can happen. The duration of sedimentation is determined by sludge settling properties, can vary from 30 minutes to up to 90 minutes.
Most commonly know as decantation, clear water removal with low suspended solids is taken out of the SBR chamber for disposal, treatment for reuse and recycle. The settled sludge is removed for further storage and disposal. After this process the plant is ready for the next treatment cycle.