Self-heating high temperature aerobic treatment device for sewage sludge

Abstract

The invention relates to a self-heating high temperature aerobic treatment device for sewage sludge. An outlet end of a pre-condensing device (1) is communicated with a first sludge conveying tube (6) through a cold sludge inlet end. The first sludge conveying tube is provided with a first sludge pump (6a). A heated sludge outlet end of a heat exchanger (2) is communicated with a second sludge conveying tube (7) through a self-heating high temperature aerobic digestion reactor (3). An outlet end of the self-heating high temperature aerobic digestion reactor (3) is communicated with a hot sludge inlet end of the heat exchanger (2) through a third sludge conveying tube (8). The third sludge conveying tube is provided with a second sludge pump (8a). A cooled sludge outlet end of the heat exchanger (2) is communicated with a denitrification reactor (4) through a fourth sludge conveying tube (9). An outlet end of the denitrification reactor (4) is communicated with an inlet end of a sludgedehydrating device (5) through an output tube (10) which is provided with a third sludge pump (10a). A peculiar smell treatment device (11), a wind guide tube (12) and a draught fan (12a) are arranged.

Description

Technical field [0001] The invention involves the treatment of sewage sludge, which is specifically for a sewage sludge self -heating high temperature and good oxygen digestion reduction device. Background technique [0002] As the sewage treatment capacity of urban and towns continues to increase, the amount of remaining sludge produced by sewage treatment has also increased.The remaining sludge generated by the sewage treatment process includes the first sinking pond sludge and the two sinking pond sludge, of which about 80%of the second sink ponds.In order to meet the requirements of the subsequent disposal of the sludge, during the processing of the sludge, the sludge is needed to reduce the amount of sludge.The quality (volume) itself. [0003] The biological reduction of sewage sludge is anaerobic, oxygen or oxygen digestion.The oxygen digestive treatment technology, that is, reduce the mass (volume) of the sludge itself by reducing the content of organic matter in the slud...

AI Technical Summary

Problems solved by technology

[0006]1. Since the moisture content of the sludge after high-temperature aerobic digestion treatment is as high as 90%, in order to meet the requirements of sludge disposal, dehydration treatment is required. During the process of high-temperature aerobic digestion reaction, due to the high temperature, the extracellular polymer mainly composed of protein and polysaccharide formed together with the cell secretion after cell rupture and lysis is very viscous, and the thermophilic bacteria are highly negatively charged. As a result, the dewatering performance of the sludge is deteriorated, and the moisture content of the dehydrated sludge is still high, so the sludge reduction effect is not obvious, and the high moisture content of the sludge is not conducive to the subsequent disposal of the sludge;

[0007]2. During the high-temperature aerobic digestion process, since the organic nitrogen in the sludge is transformed into ammonia nitrogen, the nitrifying bacteria cannot survive due to the high temperature in the reactor, and there is no nitrification Effect, the concentration of ammonia nitrogen produced by high-temperature aerobic digestion of sludge is as high as 1200mg / L, and part of the ammonia nitrogen is discharged with the released gas after aeration, forming odorous gas, affecting the environment and easily causing secondary pollution;

[0008]3. Since most of the ammonia nitrogen exists in the digested sludge, in the subsequent dehydration process, a waste liquid containing high ammonia nitrogen is formed, which is returned to the sewage The high ammonia nitrogen waste liquid after the treatment system will affect the normal operation of the sewage treatment system, making it difficult for the ammonia nitrogen index after sewage treatment to meet the requirements stably

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