Method for enriching nitrite nitrogen oxidizing bacteria granule sludge through process control

A technology of nitrogen oxidizing bacteria and granular sludge, applied in sludge treatment, biological sludge treatment, etc., can solve the problems of difficulty in forming granular sludge and poor ability of nitrite nitrogen oxidizing bacteria, so as to overcome adverse effects and improve The degree of enrichment and the effect of saving enrichment time

Active Publication Date: 2014-01-01
北控水务(中国)投资有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the biological method has poor ability to treat high-concentration nitrite wastewater and it is difficult for nitrite nitrogen oxidizing bacteria to form granular sludge, and to provide a method for process control and enrichment of nitrite nitrogen oxidizing bacteria granular sludge

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  • Method for enriching nitrite nitrogen oxidizing bacteria granule sludge through process control
  • Method for enriching nitrite nitrogen oxidizing bacteria granule sludge through process control
  • Method for enriching nitrite nitrogen oxidizing bacteria granule sludge through process control

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[0029] The inoculum sludge of the SBR system is taken from the pilot SBR that treats actual domestic sewage. The reactor volume is 12L, and the effective volume is 10L. The test water adopts the water distribution method, in which the NO in the raw water 2 - -N concentration is 200~2000mg / L, and other components are as follows per liter of distribution water: 0.4g NaHCO 3 , 1g KH 2 PO 4 , 1.31g K 2 HPO 4 And 2ml of trace element solution; trace element composition per liter of water: 1.25g EDTA, 0.55g ZnSO 4 ·7H 2 O, 0.4g CoCl 2 ·6H 2 O, 1.275g MnCl 2 4H 2 O, 0.4g CuSO 4 4H 2 O, 0.05g Na 2 MoO 4 2H 2 O, 1.375g CaCl 2 2H 2 O, 1.25g FeCl 3 ·6H 2 O, 44.4g MgSO 4 ·7H 2 O. Enrichment culture was carried out by gradually increasing the influent concentration. The system conditions are: pH 7-7.5, temperature 25°C, aeration rate 0.12m 3 / h. The specific operation steps of each cycle are as follows:

[0030] Ⅰ The water intake is 2L each time, which is control...

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Abstract

The present invention provides a method for enriching nitrite nitrogen oxidizing bacteria granule sludge through process control. According to the method, a SBR apparatus is mainly used, influent nitrite nitrogen concentration (150-2000 mg NO2<->-N / L) is gradually increased, a precipitation time is adopted as a selection element (a precipitation time is 1-10 min), and a DO-MSC (dissolved oxygen-mobile slope change) process control method is adopted to enrich nitrite nitrogen oxidizing bacteria granule sludge. According to the present invention, the DO-MSC process control is applied in the enrichment process of nitrite nitrogen oxidizing bacteria granule sludge so as to save a reaction time, save aeration, and achieve rapid enrichment of nitrite nitrogen oxidizing bacteria granule sludge, wherein the enriched sludge concentration can be more than 10 g / L, the amount of NOB is more than 80% of the total amount of bacterial, and waste water with an influent concentration of 2000 mg NO2<->-N / L can be completely treated.

Description

technical field [0001] The invention relates to a method for enriching granular sludge of nitrite nitrogen oxidizing bacteria through process control, and belongs to the technical field of wastewater biological denitrification. Background technique [0002] Nitrite is a carcinogen with a wide range of sources. It mainly exists in the production wastewater of chemical industry, medicine, food, rubber industry, printing and dyeing industry, textile industry and electroplating industry. At present, the commonly used methods for treating nitrite wastewater are mainly chemical methods, such as sodium hypochlorite method, urea decomposition method, ammonium chloride decomposition method, sulfamic acid decomposition method, photocatalytic oxidation method, etc., and chemical methods generally have harsh reaction conditions, The disadvantages of secondary pollution and high treatment costs. There are few methods of biological treatment, because higher concentrations of nitrite will...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 彭永臻董怡君张宇坤
Owner 北控水务(中国)投资有限公司
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