Continuous flow carbon-source-free biological denitrification device

Abstract

The invention relates to the technical field of environmental protection sewage treatment. The invention further discloses a continuous flow carbon-source-free biological denitrification device. The continuous flow carbon-source-free biological denitrification device comprises a uniform water distribution system, an internal circulation sand washing system, a deslagging system and a water outlet system, wherein the uniform water distribution system comprises a water inlet pipe and a water distributor, the water inlet pipe penetrates through a reaction cylinder from outside to inside and is connected with the water distributor, the bottom of the reaction cylinder is conical and is communicated with a power water pipe of the internal circulation sand washing system, and the top of the reaction cylinder is fixedly connected with a fixed beam. According to the continuous flow carbon-source-free biological denitrification device, the water distribution uniformity is improved, a water distribution system is prevented from being blocked by high-speed water flow at a water distribution opening, and the volume utilization rate of a reactor is increased; a carbon source does not need to be additionally added, so that the risk that COD (Chemical Oxygen Demand) in effluent exceeds the standard is avoided, and the problems that the COD of an existing denitrification biological filter takingthe carbon source as an electron donor exceeds the standard, denitrification biological filter packing taking a sulfur source as the electron donor is easy to lose and a fixed bed denitrification biological filter needs to be shut down for backwashing are solved.

Description

technical field [0001] The invention relates to the technical field of environmental protection sewage treatment, in particular to a continuous-flow carbon-source-free biological denitrification device. Background technique [0002] With the deterioration of water environment quality, my country's implementation of pollutant discharge standards is becoming more and more stringent. The first-class A discharge standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), which is universal across the country, requires that the TN content of tail water discharged by sewage treatment plants should not exceed 15 mg / L, which is far from the international level. After the cyanobacteria incident in Taihu Lake in 2007, some environmentally sensitive areas even required the implementation of the Class IV water discharge standard (except IV, TN not higher than 10mg / L) in the "Environmental Quality Standards for Surface Water" (GB3838-2002); Afterwar...

AI Technical Summary

Problems solved by technology

[0003] However, the current technologies for reducing TN content have encountered some technical problems in the promotion process. The traditional activated sludge method achieves biological denitrification by adding an additional carbon source (such as sodium acetate) to the treatment system, but in operation It is found that microorganisms have a strong dependence on small molecule carbon sources such as sodium acetate, and the added carbon source tends to increase. For example, in the first year of a sewage treatment plant in Wuxi, in the coldest three months (November, December and January of the following year) to add carbon sources, the second year needs to run for four months, and after five years, basically from late autumn to early summer, carbon sources need to be added for half a year; denitrifying organisms that use carbon sources as electron donors The filter tank has a high control precision, and a little carelessness will cause excessive carbon source dosage, facing the risk of COD exceeding the standard, and it needs to stop processing for about half an hour during backwashing

The fixed bed denitrification biofilter with sulfur as the electron donor, after a period of operation, the granular sulfur will be pulverized, which will lead to a large loss of powdered sulfur during backwashing, increasing the operating cost

Images