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Method for removing ammonia nitrogen from artificial leather manufacturing waste water

A technology for tannery wastewater and wastewater, applied in the field of environmental engineering, can solve the problems of ecological environment pollution, ammonia nitrogen exceeding the standard, etc., and achieve the effects of low operating cost, removal of ammonia nitrogen, and easy operation

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

S in tannery wastewater after conventional chemical and biological treatment processes 2- 、Cr 3+ , COD, BOD and other indicators can meet the emission standards, but the problem of excessive ammonia nitrogen is still very serious, and its emission concentration is mostly higher than 100mg / L, causing serious pollution to the ecological environment

Method used

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  • Method for removing ammonia nitrogen from artificial leather manufacturing waste water
  • Method for removing ammonia nitrogen from artificial leather manufacturing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Tannery wastewater, the influent water volume is 3353m 3 / d, the water quality is as follows: pH is 6.78, COD Cr 518mg / L, BOD 108mg / L, NH 3 -N is 105mg / L, SS is 338mg / L, polyaluminum chloride is added for coagulation and sedimentation pretreatment, the dosage of polyaluminum chloride is 1.5g / L, and the effluent quality is as follows: pH is 7.87, COD Cr 316mg / L, BOD 96mg / L, NH 3 -N is 74mg / L, SS is 62mg / L,

[0019] (2) Discharge the pretreated wastewater into the first hydrolytic acidification tank, the hydraulic retention time is 12h, use the microorganisms in the wastewater to hydrolyze and acidify, decompose the macromolecular organic matter into small molecular organic matter, and remove the waste water through the cell synthesis of microorganisms part of the ammonia nitrogen. After treatment, the effluent water quality is as follows: pH is 7.38, COD Cr 290mg / L, BOD 111mg / L, NH 3 -N is 35mg / L, SS is 47mg / L;

[0020] (3) Discharge the wastewater after hydro...

Embodiment 2

[0027] (1) Tannery wastewater, the influent water volume is 3187m 3 / d, the water quality is as follows: pH is 6.82, COD Cr 650mg / L, BOD 122mg / L, NH 3 -N is 171mg / L, SS is 362mg / L, polyaluminum chloride is added for coagulation and sedimentation pretreatment, the dosage of polyaluminium chloride is 1.5g / L, and the effluent water quality is as follows: pH is 7.65, COD Cr 448mg / L, BOD 115mg / L, NH 3 -N is 90mg / L, SS is 60mg / L,

[0028] (2) Discharge the pretreated wastewater into the first hydrolytic acidification tank, with a hydraulic retention time of 12 hours, use the microorganisms in the wastewater to hydrolyze and acidify, decompose the macromolecular organic matter into small molecular organic matter, and remove the waste water through the cell synthesis of microorganisms part of the ammonia nitrogen. After treatment, the effluent water quality is as follows: pH is 7.28, COD Cr 403mg / L, BOD 144mg / L, NH 3 -N is 58mg / L, SS is 53mg / L;

[0029] (3) Discharge the wastew...

Embodiment 3

[0036] (1) Tannery wastewater 1, the influent water volume is 3384m 3 / d, the water quality is as follows: pH is 6.53, COD Cr 545mg / L, BOD 98mg / L, NH 3 -N is 1205mg / L, SS is 343mg / L, polyaluminum chloride is added for coagulation and sedimentation pretreatment, the dosage of polyaluminium chloride is 1.5g / L, and the effluent quality is as follows: pH is 7.68, COD Cr 336mg / L, BOD 82mg / L, NH 3 -N is 88mg / L, SS is 56mg / L,

[0037] (2) Discharge the pretreated wastewater into the first hydrolytic acidification tank, the hydraulic retention time is 12h, use the microorganisms in the wastewater to hydrolyze and acidify, decompose the macromolecular organic matter into small molecular organic matter, and remove the waste water through the cell synthesis of microorganisms part of the ammonia nitrogen. After treatment, the effluent water quality is as follows: pH is 7.42, COD Cr 298mg / L, BOD 88mg / L, NH 3 -N is 63mg / L, SS is 44mg / L;

[0038] (3) Discharge the wastewater after hyd...

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Abstract

The invention discloses a method for removing ammonia nitrogen from artificial leather manufacturing waste water, which comprises the following steps: 1, performing coagulating sedimentation pretreatment of the artificial leather manufacturing waste water by adding aluminium polychlorid; 2, discharging the pretreated waste water into a first hydrolysis acidification tank to perform hydrolysis acidification; 3, discharging the waste water into an aerobic tank after the hydrolysis acidification treatment to perform aerobic aeration treatment; 4, discharging the effluent of the aerobic tank into a middle settling tank to remove suspended matters; 5, discharging the effluent of the middle settling tank into a second hydrolysis acidification tank to perform secondary hydrolysis acidification treatment; 6, discharging the effluent of the second hydrolysis acidification tank into a oxidation ditch to perform plugflow aeration treatment; 7, discharging the effluent of the oxidation ditch into a second settling tank to remove the suspended matters; and 8, discharging the effluent of the second settling tank into an eco-pond to perform ecological treatment and directly discharging the processed waste water. The method overcomes the drawbacks of undesirable denitrification effect, unstable and nonstandard effluent, and the like of the prior processing art and has the advantages of simple and convenient operation, low operation cost, high impact load resistance, and the like.

Description

technical field [0001] The invention relates to a method for removing ammonia nitrogen in tanning wastewater, and belongs to the technical field of environmental engineering. Background technique [0002] Leather industry is one of the industries with serious water pollution in my country's light industry, ranking third among the key polluting industries in my country. According to statistics, there are nearly 3,000 tanning enterprises in my country, and the annual sewage discharge is about 200 million tons, causing serious pollution to the environment. Tannery wastewater is organic wastewater with high concentration, and the main pollutants are COD and NH 3 The -N content is relatively high, and the processing is difficult. Especially with the increasingly stringent control of ammonia nitrogen in the country, the problem of difficult treatment of ammonia nitrogen has become increasingly prominent, which has added new difficulties to the treatment of tannery wastewater. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/24
Inventor 史惠祥万先凯徐新华谢春生韩家荣赵伟荣
Owner ZHEJIANG UNIV
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