Water source heat pump and sludge anaerobic assimilation integration method and system

A water source heat pump, anaerobic digestion technology, applied in heat recovery system, dehydration/drying/concentrated sludge treatment, heat pump and other directions, can solve the problems of high cost application, low efficiency of normal temperature sludge anaerobic digestion, etc., to achieve no pollution Environment, energy saving, energy saving effect

Inactive Publication Date: 2008-08-13
TSINGHUA UNIV
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Problems solved by technology

Anaerobic digestion of sludge has been widely used all over the world. The anaerobic digestion of normal temperature sludge has low efficiency and is rarely used by people. However, high temperature anaerobic digestion requires a lot of heat energy and its high cost also limits its application.

Method used

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  • Water source heat pump and sludge anaerobic assimilation integration method and system

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Embodiment

[0025] A sewage treatment plant with a scale of 10,000t / d produces about 36m of sludge with a water content of 96% 3 , the secondary effluent temperature is 18°C, and the heat required for anaerobic digestion of sludge at medium temperature (about 35°C) is 3.024×10 6 kJ, the heat that the heat pump can extract from the secondary effluent is 140×10 6 kJ (assuming that the water temperature is lowered by 5°C), assuming that the conversion efficiency of the heat pump to provide energy for sludge digestion is 80%, it can be seen from the above data that the heat generated by the heat pump absorbing waste heat from sewage can far meet the needs of sludge anaerobic digestion heat. At the same time, the biogas generated by the anaerobic digestion of the remaining sludge can be used to dry the sludge and / or drive the aeration blower.

[0026] Existing data show that the power consumption of urban sewage treatment plants accounts for about 60% to 90% of the total energy consumption, ...

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Abstract

The present invention provides a water source heat pump and a sludge anaerobic digestion integration method and the system thereof, belongs to the filed of saving energy and lowering the consumption by the sewage treatment plant. The method uses the water source heat pump for realizing the recovery of low-grade heat energy in the discharging water of the sewage plant. The sludge generated by the municipal sewage plant enters the anaerobic reactor and is heated by the hot water provided by the heat pump which extracts heat from the discharged water to react for generating marsh gas, and the marsh gas is used for drying the sludge or driving the aeration blast engine. The digested sludge passes a series of processes such as mechanical dehydration and anhydration to obtain the dewatered sludge which can be used as the high quality fertilizer or solid fuel. The method and the system can realize the stabilization of the sludge and set the stage for the subsequent reducing and resource disposing of the sludge, the configuration of water, heat and energy at the inner part of the sewage plant can be optimized and the whole energy consumption of the sewage plant can be reduced for above 20%.

Description

technical field [0001] The invention belongs to the technical field of energy saving and consumption reduction of sewage treatment plants, and relates to a low-consumption and high-efficiency sludge stabilization method and system which combine waste heat recovery and utilization of sewage plant effluent with medium-temperature or high-temperature anaerobic digestion of sludge. The method is to use the heat pump to recover the heat energy of the secondary effluent of the urban sewage treatment plant as the heat source for the anaerobic digestion of the sludge at medium temperature or high temperature. energy saving and consumption reduction. Background technique [0002] With the acceleration of urbanization and the gradual improvement of environmental protection requirements, the number of urban sewage treatment plants is increasing day by day. my country's "Eleventh Five-Year" development plan clearly requires that my country strengthen the construction of urban sewage tr...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/12F25B30/06
CPCY02E50/343Y02B30/52Y02B30/123Y02E50/30
Inventor 吴静史琳韩丽施汉昌昝成田磊周红明
Owner TSINGHUA UNIV
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