Urban graywater management (India)

The analysis of data related to greywater management practice in Malihabad NP indicates that presently most of the household greywater is discharged into the stormwater drain, which is ultimately discharged into the nearby water bodies situated at the end of the drain. The wastewater monitoring in these waterbodies indicates that out of the 10 water bodies in Malihabad town, 4 waterbodies are receiving greywater with moderate to higher concentration. Hence it is recommended to treat the greywater flowing into these waterbodies using appropriate treatment methods to discharge the treated wastewater with the required discharge standards. Also, for the balance of 6 waterbodies, it is recommended to provide a basic level of treatment before discharging into these waterbodies. Considering the type and size of the town, the amount of greywater discharged, the concentration of greywater, and the availability of resources (human resources and annual balance sheet) with the ULB, it is proposed to adopt the nature-based treatment system for the treatment of greywater. Under this project, it is proposed to use the DEWATS-based treatment modules integrated with the pond-based treatment. In order to set up a treatment system near the respective water bodies, it is estimated that ULB should mobilize INR 3.35 crores. ULB can consider mobilizing this fund from various government programs such as SBM2 or the Central and State Finance Commission. Presently it is proposed to discharge the treated greywater into the waterbodies for maintaining the water balance of the waterbodies, however, other reuse opportunities also can be explored which will help the town to reduce the freshwater consumption for various non-domestic uses.