The major policy of energy conservation and emission reduction is the basic requirement for the comprehensive implementation of the scientific concept of development and the sound and rapid economic and social development. Beijing Drainage Group Gaobeidian sewage treatment plant, daily treatment of water accounts for about 35% of the total sewage treatment in Beijing. Since its operation in 1993, a total of 2.8 billion cubic meters of sewage has been treated, equivalent to 740 Kunming Lake water, achieving a COD removal of 830,000 tons and playing a key role in energy saving and emission reduction in Beijing. After 14 years of steady operation, it not only improved the water environment but also played a positive role in alleviating the water shortage in Beijing. The rational use of biogas power generation Gaobeidian sewage treatment plant sludge treatment using two temperature anaerobic digestion process, biogas as a by-product of sludge treatment process, sludge is part of the organic pollutants generated in the digestion process. The main component of biogas is methane and carbon dioxide. Compared with other gas, biogas is a kind of combustible gas with high calorific value and is a good clean fuel. Traditionally, biogas has been used for heating, cooking and lighting. Biogas power generation is a biogas utilization technology that has been developed along with the comprehensive utilization of biogas. It uses biogas on the engine to generate electric energy and heat energy. An Important Way to Use Biogas Effectively. According to the person in charge of Gaobeidian sewage treatment plant, the plant digests about 4,000 cubic meters of sludge daily, digesting about 25,000 cubic meters of biogas generated for biogas power generation. The factory now has a total of 5 biogas generators, with a total power of 2,800 kilowatts. Normal operation of 4 units, to meet the plant's total electricity consumption of about 30%. In addition, the large amount of heat energy generated during the operation of the biogas generator provides the heat for the digestion of the sludge and improves the comprehensive utilization efficiency of the biogas. Gaobeidian sewage treatment plant since its inception so far, the cumulative generating capacity of 65 million kilowatt hours, for 125,000 people a year of electricity. Recycled water irrigation reuse Gaobeidian sewage treatment plant is now the largest domestic sewage back to the amount of sewage treatment plants, back to about 300,000 cubic meters / day, equivalent to 12% of Beijing's tap water supply, Gaobeidian sewage treatment plant since Since its inception, the cumulative supply of reclaimed water has reached 500 million cubic meters. Beijing is a city with severe water scarcity. Using a lot of reclaimed water can effectively relieve water shortage in urban areas. It is of great significance in today's society where there is a serious shortage of water resources. Recycled water can be used for toilet flushing, garden and farmland irrigation, road cleaning, car washing, urban fountains, cooling equipment, replenishment of water and more. Mainly used in the following areas: for the factory area of ​​about 260,000 square meters of green watering and equipment flushing, cooling; water supply to the six plants, through its depth after the supply of part of the factory business water and municipal green water supply; supply Gaobeidian Lake is used to replenish water and cooling water at Beijing No. 1 Thermal Power Plant. Sewage heat pump technology for heating and sewer Heat pump technology is the use of sewage in winter and cool in summer, it is used for heat exchange medium, in winter heating, summer cooling, air-conditioning than the air-conditioning medium saving about 25%. "Sewage air conditioning" will be cooled or warmed water through the pipe to each room, and then blow the fan, air conditioning or heating to fill the room. Compared with the traditional air conditioning system, the exchange of sewage temperature will not cause any environmental pollution. Taking a wastewater treatment plant with a capacity of 10,000 cubic meters as an example, in winter, the heat with a temperature difference of 7 ℃ can be extracted from the sewage, which can heat about 83,700 square meters of buildings and release 12 ℃ of temperature difference to the sewage in summer. About 65,000 square meters of building cooling. It can be seen from these figures that the latent energy stored in sewage water is very impressive and very valuable if it can fully utilize the heat in sewage water. Currently, Gaobeidian Wastewater Treatment Plant Phase I and Beijing Drainage Group Technical Training Center all use central air-conditioning by sewage heat pump technology for central heating and heating, saving a lot of energy consumption.
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