What treatment process should be used for domestic wastewater in residential areas?
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For domestic wastewater from residential areas, with a flow rate of 200 tons per day, and the requirement to meet the first-level discharge standards for comprehensive wastewater discharge, what treatment process should be used? Can CAST be used?
Wastewater treatment in residential areas is mostly carried out using combined methods, including multi-stage aerobic treatment, anaerobic + aerobic treatment, anaerobic + anoxic treatment, etc. From the perspective of reducing energy consumption and recovering bioenergy, anaerobic biological treatment holds great promise. The organic substances in wastewater possess inherent potential energy. During anaerobic treatment, on the one hand, there is no need for aeration to supply oxygen, which reduces energy consumption; on the other hand, the biogas produced can be reused for heating residential areas, thus helping to create an ecological balance within those areas. This represents an ideal direction for development.