Enhanced nitrogen and phosphorus removal device and method for low-carbon sewage

Abstract

The invention discloses an enhanced nitrogen and phosphorus removal device and method for low-carbon sewage. The enhanced nitrogen and phosphorus removal device comprises a biosorption tank, a sedimentation tank, a nitration reaction tank, an anoxic denitrification tank, a secondary aeration tank and a secondary sedimentation tank which are sequentially connected through pipes, and also comprisesa sludge regeneration tank, wherein the biosorption tank is connected with a short-generation sludge feeding device through a pipe; a sediment outlet of the sedimentation tank is connected with the sludge regeneration tank and the anoxic denitrification tank through pipes, and the sludge regeneration tank is connected with the biosorption tank through a pipe; a sludge outlet of the secondary sedimentation tank is connected with the nitration reaction tank through a pipe; an aeration device is arranged on each of the nitration reaction tank, the secondary aeration tank and the sludge regeneration tank. The invention further discloses an enhanced nitrogen and phosphorus removal method for the low-carbon sewage. By using the device for treating the low-carbon sewage, the utilization efficiency of a carbon source can be improved, biological nitrogen and phosphorus removal capability of the device is enhanced, and the operation cost of a sewage treatment plant can be reduced.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an enhanced denitrification and dephosphorization device and method for low-carbon source sewage. Background technique [0002] Nutrient salts such as N and P are important factors for the eutrophication of lakes, rivers, reservoirs and other surface waters. As the country strengthens water pollution control, the control of total nitrogen and total phosphorus in the effluent of sewage treatment plants will become increasingly strict. [0003] In the secondary biochemical treatment process of sewage treatment plants, the removal capacity of TN and TP is closely related to carbon source. It is generally believed that BOD / TN greater than 4 and BOD / TP greater than 20 are the basic conditions for biological nitrogen and phosphorus removal. Insufficient, especially under the condition of lack of high-quality carbon source (BOD), no matter what secondary biochemical treatment process is ...

AI Technical Summary

Problems solved by technology

Although method 1 can increase part of the carbon source, the increased carbon source is suspended COD, which has poor biochemical properties and is not a high-quality carbon source for the nitrogen and phosphorus removal process; method 2 has the same carbon source properties as method 1, and strengthens denitrification for the secondary biochemical system Phosphorus removal efficiency has little effect; Method 3 needs to add anaerobic fermentation tank, which requires 3-4d residence time, which requires a large investment, and the non-polar components in the sediment of the primary sedimentation tank are relatively high, even after anaerobic fermentation treatment, the amount of high-quality carbon source is also Very limited; Method 4 newly added residual sludge digestion supernatant contains high TN and TP in addition to COD, as a carbon source supplement, it will also increase the load of TN and TP in the influent to a certain extent

In fact, the existing methods for improving the utilization efficiency of carbon sources in sewage treatment plants are mainly aimed at the adsorption of organic matter by suspended particles in sewage influent or the digestion of organic matter by residual sludge, without considering the hydrolysis and acidification of colloidal organic matter in sewage to improve its utilization efficiency

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