Enhanced sewage denitrification and dephosphorization system exploiting and utilizing carbon source in sludge in situ and enhanced sewage denitrification and dephosphorization method exploiting and utilizing carbon source in sludge in situ

Abstract

The invention provides an enhanced sewage denitrification and dephosphorization system exploiting and utilizing the carbon source in sludge in situ and an enhanced sewage denitrification and dephosphorization method exploiting and utilizing the carbon source in sludge in situ. The treatment system comprises a raw water tank, an A / O nitrification reactor, a secondary sedimentation tank, an intermediate water tank, a sludge storage tank, an anaerobic fermentation-synchronized denitrification reactor, a chemical precipitation tank, a controller and a drain tank. The method applying the treatment system is as follows: high-ammonia nitrogen concentration sewage and residual sludge are respectively filled up in the raw water tank and the sludge storage tank, the sewage is first nitrified in the A / O nitrification reactor, the sewage and the residual sludge then enter the anaerobic fermentation-synchronized denitrification reactor together, residual sludge fermentation product is utilized as carbon source to carry out denitrification, and finally, the sewage and the sludge enter the chemical precipitation tank assorted with the on-line controller in order to precipitate and remove ammonia nitrogen and phosphorus, and are then discharged. The invention organically integrates the anaerobic biological treatment technology, the aerobic treatment technology and the chemical treatment technology in order to realize the low-carbon consumption treatment of high-pollution sewage and the reduction of residual sludge and recycle resource matters in sewage.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of sewage sludge, in particular to a system and method for in-situ development and utilization of carbon sources in sludge to strengthen sewage denitrification and phosphorus removal. Background technique [0002] The denitrification process of sewage biological treatment requires organic matter as a carbon source, and generally requires BOD / TKN>4. However, most urban sewage in my country, especially industrial wastewater with high ammonia nitrogen concentration, has a serious shortage of carbon sources. Its own carbon The carbon source cannot meet the demand of denitrification at all, and the insufficient carbon source becomes the key reason why the total nitrogen of sewage biological treatment does not meet the standard. The existing domestic sewage biological treatment system often supplements the carbon source demand by adding methanol and other external carbon sources, which no...

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Problems solved by technology

[0002] The denitrification process of sewage biological treatment requires organic matter as a carbon source, and generally requires BOD / TKN>4. However, most urban sewage in my country, especially industrial wastewater with high ammonia nitrogen concentration, has a serious shortage of carbon sources. Its own carbon The carbon source cannot meet the demand for denitrification at all, and the insufficient carbon source becomes the key reason why the total nitrogen of sewage biological treatment does not meet the standard.

The existing domestic sewage biological treatment system often supplements the carbon source demand by adding methanol and other external carbon sources, which not only increases the treatment cost, but also intensifies the CO2 emission and excess sludge production of the water plant.

[0003] In addition, due to the large output of residual sludge in the sewage biological treatment system, its treatment cost is high. Therefore, for a typical urban sewage treatment system, the sludge treatment cost accounts for about 40% of the total cost, and the residual sludge The treatment and disposal can easily cause the secondary release of nutrient elements and cause secondary pollution

[0004] Since anaerobic biological treatment technology has the advantages of low energy consumption and low sludge output, but it is difficult to achieve simultaneous removal of carbon, nitrogen, and phosphorus in sewage by simple anaerobic technology. Therefore, how to combine anaerobic biological treatment, aerobic The organic integration of treatment and chemical treatment, in order to consider the treatment and disposal of sewage and sludge as a whole, so as to realize the treatment of highly polluted sewage with low carbon consumption, and complete the recovery of resource substances in sewage, has become an important issue that needs to be solved urgently

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