Method for biologically treating wastewater by simultaneously desulfurizing, denitrifying and decoloring

Abstract

The invention discloses a method for biologically treating wastewater by simultaneously desulfurizing, denitrifying and decoloring, and aims to provide the novel biological anaerobic method for biologically treating the wastewater by simultaneously desulfurizing, denitrifying and decoloring, which has the advantages of low energy consumption, high treatment efficiency, low operating cost, less residual sludge and no secondary pollution. The method comprises the following steps that: the wastewater firstly enters an up-flow anaerobic biological reactor (UASB) and is treated by the up-flow anaerobic biological reactor (UASB); sulfide in effluent is recovered; the effluent enters a primary anaerobic baffled reactor (ABR) and is treated; the effluent is subjected to microaeration to make a molar ratio of nitrate nitrogen to ammoniacal nitrogen in the effluent be (1-1.3):1; and the treated effluent enters a secondary anaerobic baffling plate reactor (ABR), is treated to reach the standard and then is discharged. The method can be used for industrially treating high-concentration sulfate, ammonia nitrogen, stubborn organic pollutants and industrial wastewater with high chromaticity.

Description

Technical field: [0001] The invention relates to a biological treatment method for wastewater, in particular to a biological treatment method for wastewater that simultaneously desulfurizes, denitrogenates and decolorizes. Background technique: [0002] In my country, various industrial wastewaters typically represented by tannery wastewater contain high concentrations of sulfate, ammonia nitrogen, and recalcitrant organic pollutants, with high chroma. At present, the methods used for tannery wastewater treatment mainly include: coagulation precipitation method, adsorption method, advanced oxidation technology, direct recycling method, air flotation method, acid absorption method, catalytic oxidation method, and biochemical method. The above treatment methods either need to add a large amount of chemicals in the treatment process, and the sludge output is large, or the system energy consumption is high, resulting in high operating costs, low removal rates of ammonia nitrogen...

AI Technical Summary

Problems solved by technology

The above-mentioned treatment methods either need to add a large amount of chemical agents during the treatment process, and the sludge output is large, or the energy consumption of the system is high, resulting in high operating costs, low removal rates of ammonia nitrogen and color, and accompanied by aeration to blow off hydrogen sulfide odor pollution

The primary inhibitory effect on the anaerobic digestion reaction due to competition between sulfate-reducing bacteria (SRB) and methanogens (MPB) for common substrates (acetic acid and hydrogen), and the H2S produced by the reduction of sulfate-reducing bacteria on the methanogens (MPB) and other anaerobic bacteria secondary inhibition, thus limiting the use of anaerobic treatment technology for this type of wastewater

The existence of the above problems has caused a large number of sewage treatment plants in my country to fail to operate normally due to high costs, or difficult to meet the relevant national water quality discharge standards, which has become one of the important reasons why my country's pollution situation is difficult to solve

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