Maidao Sewage Plant's biogas power generation is more than 9 million kWh/year. The environmental benefits are considerable

According to news reports, Qingdao City has built and operated a total of 23 sewage treatment plants with a total treatment capacity of 1.7 million cubic meters per day. The annual biogas power generation of Maidao Sewage Treatment Plant is more than 9 million kilowatt-hours. Calculated by the average annual electricity consumption of each household in Qingdao City is 1,200 kWh, which is equivalent to the annual electricity consumption of 7,000 households. According to reports, the level of sludge digestion and stability treatment, biogas power generation, and waste heat recovery and utilization in Qingdao sewage treatment plants is listed in the country. The Urban Water Supply and Drainage Association plans to hold a on-site meeting in 2016 to promote Qingdao's experience. The rational disposal and comprehensive utilization of sludge, biogas and waste heat have significant economic, social and environmental benefits. Taking Maidao Sewage Treatment Plant as an example, the sludge produced during the sewage treatment is reduced and stabilized through anaerobic digestion process, achieving a reduction of sludge by nearly 40%, greatly saving sludge transportation and subsequent disposal costs; anaerobic digestion produces about 6 million cubic meters of biogas per year, of which 85% is used for cogeneration, and electricity production and waste heat recovery are carried out through generators and waste heat boilers. The generated electricity is for production and self-use in the factory. 60% of the power consumption of the entire plant comes from biogas power generation, and the annual biogas power generation is more than 9 million kilowatt-hours. Calculated by the average annual electricity consumption of each household in Qingdao City is 1,200 degrees, which is equivalent to the annual electricity consumption of 7,000 households. The rest of the biogas is heated through gas boilers for heating the digestion process and the plant's employees' showers, winter heating and other daily use to balance the waste heat shortage, which is equivalent to saving nearly one million cubic meters of natural gas every year. Since the plant was put into operation, it has not purchased fuel in terms of process operation. Over the past seven years, Maidao Factory has reduced carbon dust emissions by 16,255.27 tons, CO2 emissions by 58,387.51 tons, SO2 emissions by 1,792.86 tons, and nitrogen oxide emissions by 896.43 tons, with extremely considerable environmental benefits. New energy is an inevitable trend in the current social development and the focus of our Haixing people’s transformation! ! !