sewage. In this paper, the waste heat utilization schemes were ditermined according to actual situations.IV. COMPREHENSIVE UTILIZATION TECHNOLOGY RESEARCH OF WASTE HEATThis paper mainly studied the utilization technology of waste heat of biogas power plants. Part of the waste heat was sent into the anaerobic digester tanks in order to maintain the best temperature environment of anaerobic digestion process. The comprehensive utilization of the other part of waste heat was determined in accordance with actual situations. The two main schemes for making use of waste heat in large breeding farms were as follows:Scheme A: On condition that the biogas power plants were near to the residential areas or the breeding farms had the actual needs of heating or air-conditioning themselves. The waste heat could be used as cooling load of building through LiBr absorption refrigeration units in summer and as heating load through heat exchangers in winter. In transitional seasons, waste heat could be heated by waste heat boilers to provide hot water or steam to residents or factories. Waste heat also could be used as the energy of dehumidifiers and drying systems [9]. For agriculture demonstration zones, the temperature in greenhouses needed to maintain at a certain value in order to promote the growth of plants. The common method was to install heating system in greenhouses by radiators or hot water pipes. So the residual heat could be used as heating load of greenhouse heating system in agricultural zones. The schematic diagram of scheme A is shown in Fig. 3.Scheme B: As for large breeding farms, there had the actual needs of poultry product processing industry. This would promote local economic development and partly resolve the employment problems of local farmers. This must use cold storages for poultry product storage. So on the condition that it was not economic for the long-distance transportation of cold and heat, waste heat could be used as the power resources of cold storages and the remaining heat could also be used as the power of production links such as slaughterhouses and so on.Ammonia absorption refrigeration units that used waste heat as power had the advantages like low greenhouse gas emission,