Device and method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization

A technology for comprehensive treatment of organic wastewater, applied in the field of environmental engineering, can solve the problems of sulfur oxidation phase failure, easy breeding of aerobic heterotrophic bacteria, etc., achieve the effect of releasing inhibition, reducing the amount of alkali input, and good economic benefits

Inactive Publication Date: 2012-11-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste water of the traditional sulfate reduction and sulfur oxidation combined desulfurization process passes through the two phases (CN 1218868C) in sequence, and in addition to sulfide, there are also organic matter and other nutrients from the sulfate reduction phase to the sulfur oxidation phase, and the sulfur oxidation phase is under micro-aerobic conditions , which leads to sulfur oxidation and facilitates the growth of aerobic heterotrophic bacteria
The competitiveness of aerobic and heterooxygenous bacteria is stronger than that of autotrophic sulfur-oxidizing bacteria, and it is easy to form a dominant bacteria group to inhibit the activity of sulfur-oxidizing bacteria, resulting in the failure of the sulfur-oxidizing phase in a short time

Method used

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  • Device and method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization
  • Device and method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization
  • Device and method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 simulated acidic sulfate organic wastewater

[0048] Sodium lactate is used to simulate COD, the concentration is 10g / L, and other components in the simulated wastewater are (g / L): NH 4 Cl 1.0, KH 2 PO 4 1.0, MgCl 2 0.05, yeast extract powder 0.1, tryptone 0.1, CaCl 2 0.01, FeCl 3 0.01, MnSO 4 0.01, 1ml of 98% concentrated sulfuric acid, adjust the pH value to 1.2, 2.4, 3.6, 4.8.

[0049] The circulating gas between the gas stripping tower and the absorption tower is nitrogen.

[0050] In the sulfate reduction reactor, the methanogenic activated sludge circulated through the 100 mg / L sulfate culture solution contains sulfate reducing bacteria and methanogenic bacteria.

[0051] The sulfur oxidizing bacteria used in the sulfur oxidation reactor is Thiobacillus thioparus CGMCC 4826.

[0052] The circulating liquid between the hydrogen sulfide absorption tower and the sulfur oxidation reactor is (g / L): 0.1M Na 2 CO 3 / NaHCO 3 Buffer, pH 7.5-8.0.

...

Embodiment 2

[0056] Example 2 dilute acid pretreatment straw organic wastewater treatment

[0057] Treat corn stalks with 1% (v / v) dilute sulfuric acid at 120° C. for 2 hours, wash with water 3 to 4 times, and use the treated stalks for cellulose enzymolysis. This dilute acid pretreatment process produces acidic sulfate organic wastewater. The COD of the wastewater is 2600mg / L, and the sulfate concentration is 1200mg / L.

[0058] Reactor loads of 600, 1200, 2400, 3600g SO 4 2- / (d·m 3).

[0059] The circulating gas between the gas stripping tower and the absorbing tower is methane.

[0060] In the sulfate reduction reactor, the methanogenic activated sludge circulated through the 100 mg / L sulfate culture solution contains sulfate reducing bacteria and methanogenic bacteria.

[0061] The sulfur oxidizing bacteria used in the sulfur oxidation reactor is Thiobacillus thioparus CGMCC 4826.

[0062] Wherein, the simulated wastewater flow rate is controlled to make the pH value of the mixe...

Embodiment 3

[0063] Embodiment 3 bisulfite process pulping wastewater treatment

[0064] The wastewater produced by bisulfite pulping has a COD value of 1200-1400mg / L and a sulfate concentration of 600-700mg / L.

[0065] The reactor load is 2400g SO 4 2- / (d·m 3 ).

[0066] Other operating methods and operations are the same as in Example 1. The final effluent sulfate content is not higher than 60.2-136.9mg / L, the sulfate removal rate is 90.2%-94.9%, and the COD value is 24.3-67.9mg / L. The biogas output is 0.02~0.03m 3 d -1 m -3 .

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Abstract

The invention belongs to the field of environmental engineering, and in particular relates to a device and a method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization. The method comprises the following steps of: 1, reducing sulfate in the organic waste water, blowing hydrogen sulfide off, namely (1-1) mixing the acidic sulfate organic waste water and sulfide-containing recirculation water in an anaerobic digestion reactor, controlling the pH of the mixture to be 5.0 to 6.0, and thus obtaining a hydrogen sulfide-containing acidic mixed solution, and (1-2) introducing inert gas, blowing the hydrogen sulfide off, adding sulfate reducing bacteria, reducing the sulfate to form sulfide, obtaining the sulfide-containing recirculation water and returning to the step (1-1); and 2, absorbing, oxidizing and recycling the hydrogen sulfide, namely (2-1) absorbing the hydrogen sulfide blown off in the step (1-2) by using a weak alkaline solution, adding sulfur-oxidizing bacteria, oxidizing the hydrogen sulfide to form elemental sulfur, separating to obtain the elemental sulfur and effluent, and (2-2) treating the effluent for recycling. By the device and the method, sulfate innocent treatment and resource recovery treatment are realized.

Description

technical field [0001] The invention belongs to the field of environmental engineering. Specifically, the invention relates to a comprehensive treatment device and method for acidic sulfate organic wastewater based on biological desulfurization. Background technique [0002] Sulfuric acid and sulfurous acid are important chemical raw materials, widely used in paper pulping, agricultural fertilizers, microbial fermentation and other fields, resulting in a large amount of acidic sulfate organic wastewater, among which the discharge of pollutants in the paper industry is second only to the chemical industry , the wastewater discharge is 3.18 billion tons, accounting for 16.1% of the national industrial wastewater discharge, and the COD discharge is 1.488 million tons, accounting for 33% of the national COD discharge. Taking acidic sulfite pulping wastewater as an example, the pH value is 12-2.0, the COD is 500-2000mg / L, the SO 4 2- and SO 3 2- The total concentration reache...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 邢建民宋子煜李强王丹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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