Ammonia nitrogen processing method for hide manufacture wastewater

Abstract

The invention provides an ammonia nitrogen treatment method of tanning waste water. The method comprises the following step that: a biological filter 1 is filled with clinoptilolite and then autotrophic nitrobacteria are fed in the filter 1 to carry out cultivation and biofilm formation (need to be carried out under the conditions of oscillation or ventilation because the nitrobacteria are aerobes); a biological filter 2 is filled with clinoptilolite and then heterotrophic denitrifying bacteria are fed in the filter 2 to carry out the cultivation and the biofilm formation (can be carried out just under a static condition because the denitrifying bacteria are anaerobes); the tanning waste water is fed in the biological filter 1 first so as to carry out oxygen supply treatment for 40 to 60 minutes; and then, waste water discharged from the biological filter 1 is fed into the biological filter 2 to carry out anaerobic treatment for 40 to 60 minutes. The ammonia nitrogen treatment method has the following main advantages that: COD in the secondary effluent of the tanning waste water can be reduced from 100 to 200mg / L to 40 to 80mg / L, while ammonia nitrogen content is reduced from 40 to 200mg / L to 10 to 35mg / L and total nitrogen is reduced by approximately 60 percent; therefore, the secondary effluent meets the requirements of treatment before the secondary effluent is fed into an urban sewage disposal plant; moreover, the ammonia nitrogen treatment method has large biofilm formation quantity, high ammonia nitrogen removing efficiency and lower cost of equipment and operation.

Description

(1) Technical field [0001] The invention relates to a method for treating ammonia nitrogen in tannery wastewater, in particular to a method for treating ammonia nitrogen in tannery wastewater with a zeolite-autotrophic and heterotrophic bacterial biological filter, and relates to the advanced treatment of the secondary effluent of biochemical treatment of tannery wastewater and Reuse. (2) Background technology [0002] The leather industry is closely related to the lives of the people in our country and occupies a very important position in the national economy. However, the tanning industry discharges more than 100 million tons of waste water to the environment every year. Its characteristics are: high alkalinity, deep color, high oxygen consumption, high suspended solids, and more toxic substances such as sulfide and chromium. It belongs to industrial wastewater that is seriously polluted and difficult to treat. [0003] As the sustainable development strategy has become...

AI Technical Summary

Problems solved by technology

my country's overall requirements for wastewater treatment in tannery factories must meet the treatment requirements before entering urban sewage treatment plants (referred to as secondary effluent from tannery). At present, the common problem in the country is that other indicators of wastewater from tannery industries basically meet the requirements. , but the ammonia nitrogen cannot reach the standard, which is a serious problem that plagues the treatment of industrial wastewater in various tanneries

This technology has the following deficiencies: (1) It can only treat low-concentration domestic sewage, sewage containing low ammonia nitrogen, and cannot treat industrial wastewater; (2) Natural microorganisms are used in the biological aerated filter, naturally growing microorganisms, survival of the fittest , what kind of microorganisms may reproduce, but the efficiency of removing ammonia nitrogen is not high; (3) The operating cost is high, because the water-air ratio is as high as 1:1-1:3, and the recoil process has three stages, and the power consumption is large

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