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Process for rapidly realizing short-cut nitrification and denitrification of leather wastewater

A short-range nitrification and leather wastewater technology, which is applied in animal processing wastewater treatment, aerobic and anaerobic process treatment, water pollutants, etc., can solve the problems of high cost investment, long start-up time, complicated operation, etc., and solve the problems that are difficult to achieve Industrial application, avoiding unqualified effluent indicators, and simple process operation

Inactive Publication Date: 2020-01-14
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, although the above-mentioned short-range nitrification and denitrification process has been widely concerned and recognized, most of the processes are still in the stage of small scale test and pilot scale test, with complex operation, high cost input, long start-up time, and difficult to realize industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of short-range nitrifying bacteria

[0031] (1) Take the aerobic activated sludge from the biochemical system of leather wastewater treatment and inoculate it into the short-range nitrifying bacteria culture reactor, and the inoculation concentration is MLSS 2000-5000mg / L;

[0032] (2) Use 200-300mg / L ammonia nitrogen water as the reactor water, control the pH of the reactor to 7.5-8.5, and the temperature to 25-35°C, and add special inorganic salt medium for short-range nitrifying bacteria into the reactor , the medium formula is: water as solvent, sodium chloride 0.3-1.0g / L, anhydrous magnesium sulfate 0.05-0.2g / L, ferrous sulfate heptahydrate 0.1-0.5g / L, trace element mother solution 1-10ml / L; trace element mother liquor formula: cobalt chloride hexahydrate 0.3-0.6g / L, manganese chloride tetrahydrate 1.0-3.0g / L, sodium molybdate dihydrate 0.1-0.5g / L, ventilate into the reactor, control The concentration of dissolved oxygen is 0.5-2mg / L, and short-term n...

Embodiment 2

[0036] After the physical and chemical pretreatment of a tannery wastewater, the tested wastewater indicators are: ammonia nitrogen 1200mg / L, nitrate nitrogen and nitrite nitrogen close to 0mg / L, total nitrogen 1400mg / L, COD 1500mg / L, and the total volume of the biochemical system is 2000m , the concentration of nitrite nitrogen in the effluent of the aerobic pool is 0mg / L, the concentration of nitrate nitrogen is 600mg / L, and the standards for the discharge of leather wastewater are implemented (ammonia nitrogen ≤ 70mg / L, total nitrogen ≤ 140mg / L, COD ≤ 300mg / L), Use this method to adjust the operation process as follows:

[0037] (1) Take the aerobic activated sludge from the biochemical system of the plant and inoculate it into the SBR bioreactor with a total volume of 3m for short-range nitrifying bacteria culture, the inoculation amount is MLSS 3000mg / L.

[0038] (2) Inject the ammonia nitrogen solution with a concentration of 200mg / L into the reactor, add the special ino...

Embodiment 3

[0044] After the physical and chemical pretreatment of a tannery wastewater, the tested wastewater indicators are: ammonia nitrogen 400mg / L, nitrate nitrogen and nitrite nitrogen close to 0mg / L, total nitrogen 500mg / L, COD 600mg / L, and the total volume of the biochemical system is 6000m , the concentration of nitrite nitrogen in the effluent of the aerobic pool is 0mg / L, and the concentration of nitrate nitrogen is 150mg / L, and the discharge standard of tannery wastewater is implemented (ammonia nitrogen≤70mg / L, total nitrogen≤140mg / L, COD≤300mg / L) , using this method to adjust the operating process as follows:

[0045] (1) Take the aerobic activated sludge from the biochemical system of the plant and inoculate it into a bioreactor with a total volume of 8m for short-range nitrifying bacteria culture. The inoculum amount is 3000mg / L MLSS.

[0046] (2) Inject an ammonia nitrogen solution with a concentration of 200mg / L into the reactor, and add a special inorganic salt medium f...

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Abstract

The invention relates to the technical field of sewage treatment, and particularly provides a process for rapidly realizing short-cut nitrification and denitrification of leather wastewater. The process comprises: (1) carrying out enriching culture on tannery aerobic tank active sludge used as a bacterial source by using a special inorganic salt culture medium for short-cut nitrifying bacteria toprepare a short-cut nitrifying bacterial agent; (2) inoculating the short-cut nitrifying bacterial agent into a tannery aerobic tank according to a certain ratio, and carrying out field process regulation; and (3) after short-cut nitrification is formed in the aerobic tank, realizing short-cut nitrification-denitrification process denitrification through nitrification liquid reflux and feeding ofa carbon source into an anoxic tank. According to the invention, by combining the short-cut nitrifying bacterial culture outside the biochemical system and the biochemical system process regulation, the short-cut nitrification and denitrification process can be rapidly started, the method has advantages of short starting time, low operation cost, simplicity and convenience in operation and high total nitrogen removal rate, and the long-term stable operation of the short-cut nitrification and denitrification process of the biochemical system can be achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and specifically provides a process for quickly realizing short-range nitrification and denitrification of leather wastewater. Background technique [0002] The biological denitrification process is to convert nitrogen-containing compounds in sewage through ammonification, nitrification, denitrification, and finally into nitrogen gas. It is economical, effective, easy to operate, and has no secondary pollution. It is recognized as the most developed Promising method. [0003] Short-cut nitrification and denitrification denitrification process is a new biological denitrification process. Compared with traditional biological denitrification process, this process has the advantages of simple equipment, less energy consumption, low sludge output and high denitrification efficiency. With the development of the sewage treatment industry, the requirements for the treatment process are getting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16C02F103/24
CPCC02F3/302C02F2101/16C02F2103/24C02F2305/06
Inventor 吴书超吴文雷徐泽平杨传伦车树刚薛飞
Owner CHAMBROAD CHEM IND RES INST CO LTD
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