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Method and device for recovery and purifying elemental sulfur from high-concentration sulfate wastewater

A sulfate and high-concentration technology, applied in chemical instruments and methods, sulfur preparation/purification, water/sewage multi-stage treatment, etc., can solve problems such as difficult separation of sulfur, achieve high recovery efficiency, good economy, and industrial Apply Promising Effects

Active Publication Date: 2013-06-26
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention adjusts the concentration of sulfate in the waste water by mixing part of the treated waste water back with the waste water raw water, avoiding the addition of additional dilution water; by using halophilic microorganisms to treat sulfur oxides in the waste water, the problem of inhibition of microorganisms by high-salt waste water is solved ; Solve the problem of difficult separation of sulfur by using extraction method, and achieve sulfur purification at the same time

Method used

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  • Method and device for recovery and purifying elemental sulfur from high-concentration sulfate wastewater

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Embodiment 1

[0057] The waste water to be treated is the mixed waste water after stripping and deamination of the monosodium glutamate plant, and its main indicators are: pH: 8.0~8.5; COD: 11000~13000mg / L; SO4 2- : 8000~12000mg / L; NH 3 -N: 200-300mg / L.

[0058] In the actual treatment of wastewater, the reflux ratio of the treated wastewater is 3:1. After conditioning, the SO in the wastewater 4 2- The concentration is 4g / L; COD:SO 4 2- is 1.7; the reaction time (hydraulic retention time HRT) of the anaerobic biological treatment stage is controlled at 15h, the reaction temperature is controlled at 35±0.5°C, and the effluent SO in the anaerobic biological reduction stage 4 2- The concentration is lower than 400mg / L; the reaction time (hydraulic retention time HRT) of the aerobic biological treatment stage is controlled at 1.5h, the reaction temperature is controlled at 30±1°C, and the oxidation-reduction potential is -75mV; the extraction agent is chlorostyrene and kerosene Mixture, ...

Embodiment 2

[0060] The wastewater to be treated is the wastewater produced by the fine desulfurization of flue gas desulfurization tail gas in power plants, and its main indicators are: pH: 7.8-8.2; COD: 2- : 18000~25000mg / L; Na + : 20000~300000mg / L.

[0061] In the actual treatment of wastewater, the reflux ratio of the treated wastewater is 7:1. After conditioning, the SO in the wastewater 4 2- The concentration is 4.2g / L; COD:SO 4 2- 1.5; industrial ethanol is added to supplement the organic substrate of wastewater during wastewater conditioning; the reaction time (hydraulic retention time HRT) of the anaerobic biological treatment stage is controlled at 15h, the temperature is controlled at 35±0.5°C, and the effluent of the anaerobic biological reduction stage SO 4 2- The concentration is lower than 400mg / L; the reaction time (hydraulic retention time HRT) of the aerobic biological treatment stage is controlled at 2h, the temperature is controlled at 30±1°C, and the oxidation-red...

Embodiment 3

[0063] The wastewater to be treated is antibiotic wastewater from a pharmaceutical factory, and its main indicators are: pH: 7.2~7.8; COD: 8000~10000mg / L; SO4 2- : 4000~6500mg / L; Na + : 8000~10000mg / L.

[0064] In the actual treatment of wastewater, the reflux ratio of wastewater after treatment is 1:1. After conditioning, the SO in wastewater 4 2- The concentration is 3g / L; COD:SO 4 2- 1.2; the reaction time (hydraulic retention time HRT) of the anaerobic biological treatment stage is controlled at 12h, the temperature is controlled at 37±0.5°C, and the effluent SO in the anaerobic biological reduction stage 4 2- The concentration is lower than 400mg / L; the reaction time (hydraulic retention time HRT) of the aerobic biological treatment stage is controlled at 1.5h, the temperature is controlled at 32±1°C, and the oxidation-reduction potential is -80mV; tetrachlorethylene and heavy stone naphtha are used as extraction agents Oil mixture, the mixing volume ratio is 7:1, t...

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Abstract

The invention relates to a method and a device for recovery and purifying elemental sulfur from high-concentration sulfate wastewater. According to the invention, high-concentration sulfate wastewater is subjected to a biological desulfurization treatment; and recovery and purification upon elemental sulfur produced during the biological desulfurization process are realized with an extraction method. The device comprises sequentially connected components of: a wastewater storage tank, a microbial anaerobic reactor, a microbial aerobic reactor, an extraction tower and an extraction regeneration tower. With the method and the device provided by the invention, a problem of the difficulty in treating high-concentration sulfate wastewater can be effectively solved; and sulfur in the wastewater can be recovered with high efficiency. Therefore, a novel idea is provided for solving the problem of industrial sulfur-containing wastewater pollution.

Description

technical field [0001] The invention relates to the combined treatment of high-concentration sulfate wastewater by using microbial treatment technology and extraction technology, in particular to a method and device for recovering and purifying elemental sulfur from high-concentration sulfate wastewater. The invention can be applied to the waste water treatment process produced in chemical environment fields such as flue gas desulfurization waste water, mine waste water, electroplating waste water and pharmacy. Background technique [0002] A large amount of high-concentration sulfate wastewater is discharged in the production process of chemical, pharmaceutical, leather and paper, fermentation, food processing and mining, which has caused great harm to the ecological environment and human health. For the treatment of sulfate wastewater, traditional methods mainly include chemical precipitation and electrodialysis. Although these methods have a good effect on the treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C01B17/02
Inventor 赖桂艳郑满苹
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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