Device and method of strengthening urban domestic sewage treatment by strengthened nitrifying-DEAMOX biofilm process

Abstract

The invention discloses a device and method of urban domestic sewage treatment by strengthened nitrifying-DEAMOX biofilm process, and belongs to the technical field of biological sewage treatment. The device is mainly composed of a raw water tank, a strengthened nitrifying biofilm SBR, a middle water tank, a DEAMOX biofilm SBR and an effluent tank which are in connection in sequence. Urban domestic sewage enters the strengthened nitrifying biofilm SBR first, nitrate of the last cycle is removed by the prepositive anoxic stirring, and the complete nitrification is conduct through the subsequent aeration; effluent with nitrate and the urban domestic sewage enter the DEAMOX biofilm SBR together for denitrification, meanwhile, the nitrate generated through anaerobic ammonia oxidation is reduced to nitrite by shortcut denitrification bacteria, and the nitrite is removed through in situ anaerobic ammonia oxidation. According to the device and method, the problems of low denitrification efficiency of the urban domestic sewage and high effluent TN are solved, carbon source in the domestic sewage is taken full advantage of, and the additional carbon source consumption is reduced; in addition, on the basis of fast reaction rate of DEAMOX biofilm process and high total nitrogen removal rate and denitrification load, the advanced denitrification of the urban domestic sewage can be achieved.

Description

technical field [0001] The invention relates to a device and method for strengthening nitrification-DEAMOX biofilm process for treating urban domestic sewage, belonging to the technical field of wastewater biological treatment. Background technique [0002] At present, urban domestic sewage is mostly treated by traditional biological nitrification / denitrification process (A2 / O, A / O process), and the denitrification process requires organic carbon sources as electron donors, and NO x - -N oxidation to N 2 , and the problem of low C / N in urban domestic sewage generally exists in my country. The carbon source in domestic sewage is insufficient, resulting in low denitrification efficiency and high total nitrogen in the effluent, which cannot meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918- 2002) Class A standard, so additional carbon sources need to be added to meet the discharge standards, which undoubtedly increases the cost of sewage treat...

AI Technical Summary

Problems solved by technology

[0005] However, the growth rate of ANAMMOX bacteria is slow (the highest growth rate is 0.0027h -1 ), the generation cycle is long (10-14d), the activity is easily affected by changes in environmental conditions, and the large amount of nitrogen generated by the DEAMOX process during the reaction makes the sludge suspend in the reactor, and the sedimentation performance is poor, resulting in the bacteria easily The denitrification effect of the DEAMOX system is unstable due to the loss of nitrogen. If the method of adding fillers to hang biofilms is used, it can intercept anammox bacteria, effectively increase biomass, and solve the problem of easy loss of anammox sludge, thereby Improve the nitrogen removal load and stable operation of the system

Images