INTEGRATION OF SOLAR ENERGY WITH SEWAGE TREATEMENT PLANT

Abstract

Sewage treatment is the process of removing contaminants from wastewater. It includes the physical, chemical and biological process to remove physical chemical and biological contaminants. Collecting, treating, and discharging waste water requires energy, mostly as electricity, but also as natural gas or other fuels. National waste water treatment represent 0.1 to 0.3% of total energy consumption. Due to high electricity consumption and frequent power failure most of the STPs outside India are using renewable energy as the source of electricity. Under the present work an attempt has been made to integrate the solar energy with the 27 MLD Sewage treatment plant located at Jagjeetpur, Haridwar Uttarakhand the plant is working on sequencing batch reactor technique. The total load of the plant is 1103.23 kW and total power consumption is 21872.65 kWh/day and power failure occurs about 7 to 10 % hours per month. In this work part of the electricity is proposed to be provided through SPV system. Sizing of the SPV system is on the basis of the land availability in the sewage treatment plant and as per the solar radiation, the solar energy potential is calculated as 210 kWp and accordingly the selection of modules, inverter and transformer is done these system are connected together generated electricity is supply to the load of the plant .The current SPV system contributes 4.8 to 5 % of electricity to the plant. Techno economic and life cycle cost analysis has shown that unit cost of electricity is 6.4 Rs/ kWh .