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Wastewater treatment method for synchronously removing organic matters, sulfate radicals, heavy metals and total nitrogen

A technology for wastewater treatment and organic matter, applied in metallurgical wastewater treatment, textile industry wastewater treatment, biological water/sewage treatment, etc.

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no method to simultaneously remove these four indicators

Method used

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  • Wastewater treatment method for synchronously removing organic matters, sulfate radicals, heavy metals and total nitrogen
  • Wastewater treatment method for synchronously removing organic matters, sulfate radicals, heavy metals and total nitrogen

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Embodiment 1

[0037] Such as figure 1 Shown, the present invention a kind of waste water treatment technology that synchronously removes organic matter, sulfate radical, heavy metal and total nitrogen, adopts waste water treatment device to be anaerobic pond, reaction pond, sedimentation pond, anoxic pond, aerobic pond and MBR pond, and Sequential connections via pipes;

[0038] (1) The waste water first enters the anaerobic tank, and the organic matter in the waste water is used as an electron donor in the anaerobic tank, and sulfate-reducing bacteria will produce SO in the waste water 4 2- Revert to S 2- , S and SO 3 2- ; The inoculum volume (L or m) of the sulfate-reducing bacteria 3 ) and the effective volume of the anaerobic pool (L or m 3 ) ratio is 1: 10, and the sulfate-reducing bacteria of described inoculation is the sulfate-reducing bacteria (OD600≈1.0) that is in logarithmic growth phase; Soft packing, combined packing or MBBR biological packing are installed in the descri...

Embodiment 11

[0061] a. Take the pretreated effluent of a certain printing and dyeing wastewater as raw water, and the quality of the raw water is COD=780mg / L, Cu 2+ =1.54mg / L, total nitrogen=145mg / L, SO 4 2- =1350mg / L;

[0062] b. The hydraulic retention time of the anaerobic tank is set to 12h;

[0063] c. In the reaction tank, add NaOH to adjust the pH to 7.5, then add PAC100mg / L and APAM0.5mg / L with a molecular weight of 9 million, and set the reaction time to 15min;

[0064] d. The sedimentation time of the sedimentation tank is set to 1.0h;

[0065] e. The hydraulic retention time of the anoxic pool and the aerobic pool are both set to 8h;

[0066] f.MBR membrane flux is 0.4m 3 / m 2 d;

[0067] g. The effluent quality after treatment is, COD=190mg / L, Cu 2+ =0.08mg / L, total nitrogen=92mg / L, SO 4 2- = 1050 mg / L.

Embodiment 12

[0069] a. Take a circuit board waste water as raw water, the raw water quality is COD=323mg / L, Cu 2+ =0.97mg / L, total nitrogen=62mg / L, SO 4 2- =2850mg / L;

[0070] b. The hydraulic retention time of the anaerobic tank is set to 12h;

[0071] c. In the reaction tank, add NaOH to adjust the pH to 7.2, then add PAC100mg / L and APAM0.5mg / L with a molecular weight of 9 million, and set the reaction time to 15min;

[0072] d. The sedimentation time of the sedimentation tank is set to 1.0h;

[0073] e. The hydraulic retention time of the anoxic pool and the aerobic pool are both set to 8h;

[0074] f.MBR membrane flux is 0.4m 3 / m 2 d;

[0075] g. The effluent quality after treatment is, COD=54mg / L, Cu 2+ = 0.05mg / L, total nitrogen = 12mg / L, SO 4 2- =1150mg / L.

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Abstract

The invention discloses a wastewater treatment method for synchronously removing organic matters, sulfate radicals, heavy metals and total nitrogen. The method comprises the following steps that: production wastewater enters an anaerobic tank, organic matters are used as electron donors, and SO4<2-> in the production wastewater is reduced by sulfate reducing bacteria; the wastewater flows into thereaction tank again, S2- reacts with heavy metal ions in the wastewater to generate insoluble metal sulfide, and a coagulation reaction is carried out; the wastewater flows into a sedimentation tankfor solid-liquid separation, and metal sulfide in the wastewater is removed through sedimentation; the wastewater is flown into an anoxic tank, wherein thiobacillus denitrificans performs autotrophicdenitrification nitrogen removal by utilizing residual S2-, S and SO3<2->; and the wastewater flows into the aerobic tank, and aerobic denitrifying bacteria in the wastewater perform aerobic denitrification by utilizing residual organic matters in the wastewater to further remove nitrogen. According to the method, the energy consumption can be reduced by 30%-50%, the sludge generation amount can be reduced by 30%-40%, the manual operation amount can be reduced, and the method conforms to the development trend of treating waste with waste in future sewage treatment.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, and relates to a wastewater treatment technology for synchronously removing organic matter, sulfate radicals, heavy metals and total nitrogen, which is used for synchronously removing organic matter, sulfate radicals, heavy metals and total nitrogen in industrial wastewater. Background technique [0002] In the process of production and wastewater treatment, it is usually necessary to add chemicals or chemicals, which may cause the four indicators of organic matter, sulfate, heavy metals and total nitrogen to exist simultaneously in the wastewater. For example, chemicals used in the production process of printing and dyeing workshops and printing and dyeing wastewater treatment plants usually contain complex metal dyes, sulfuric acid, sulfates, azo dyes / nitrogenous substances and organic substances. For another example, electroplating wastewater usually contains developing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/10C02F101/20C02F101/30C02F103/16C02F103/30
CPCC02F1/5236C02F1/56C02F1/66C02F3/02C02F3/1268C02F3/28C02F3/286C02F3/30C02F3/34C02F9/00C02F2101/101C02F2101/20C02F2101/30C02F2103/16C02F2103/30
Inventor 罗新浩胡勇有
Owner SOUTH CHINA UNIV OF TECH
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