MBBR (moving bed biofilm reactor) and activated sludge process composited two-stage A/O enhanced biological denitrification process for coking wastewater

Abstract

The invention discloses an MBBR (moving bed biofilm reactor) and activated sludge process composited two-stage A / O enhanced biological denitrification process for coking wastewater. The process is implemented by using a characteristic that suspended filler is easily fluidized in a reaction tank so as to form an MBBR, then the MBBR and activated sludge are formed into a compound system, a surface biofilm of the suspended filler has nitrification and simultaneous nitrification or denitrification functions, and the system has a stronger denitrification function and stronger impact load resistance; the fluidization of suspended filler in a O-shaped tank can improve the efficiency of oxygen filling, and the aeration quantity is reduced by about 20%, thereby saving the energy consumption; and a Fenton reaction tank between two stages of A / O can improve the biodegradability of primary A / O effluent water, thereby reducing the adding amount of an additional carbon source, and reducing the running cost of the biochemical period. According to the process, a traditional activated sludge reaction tank is reconstructed, and after suspended filler is added, an MBBR and activated sludge process composited system can be formed, so that the denitrification function and impact load resistance of the system are enhanced, therefore, the process is applicable to the upgrading and reconstruction of existing coking wastewater treatment facilities.

Description

technical field [0001] The invention belongs to the field of refractory wastewater treatment, and in particular relates to a two-stage A / O (anoxic / aerobic) enhanced biological denitrification process for coking wastewater combined with MBBR and activated sludge process. Background technique [0002] Coking waste water is waste water produced during the production of coke, gas, tar and coking products in coking plants of the iron and steel industry and city gas plants. It is composed of three parts: the wet water on the surface of the furnace coal, the combined water produced by the dry distillation of the furnace coal, and the oily process wastewater in the gas pipeline and gas collection pipeline circulation oxidation pump. The water volume of this part accounts for more than 50% of the total coking wastewater ; The second is the waste water produced in the process of gas purification, such as gas final cooling water, crude benzene separation water, etc.; the third is the w...

AI Technical Summary

Problems solved by technology

However, the two-stage A / O adopts the traditional activated sludge method. Due to the high content of toxic and harmful substances in the coking wastewater and the large fluctuations in the influent water quality, it will have a greater impact on the biochemical treatment section and affect the biochemical section. When the concentration of pollutants is high, the total nitrogen in the effluent of the biochemical section cannot meet the discharge standard

In addition, the biochemical COD of the secondary A pool is very low, and supplementary carbon sources need to be added. The cost of adding carbon sources is more than 5 yuan / ton of water, which greatly increases the operating cost of the biochemical section.

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