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Catalytic ion reduction and anaerobic hydrolytic acidification cooperated industrial wastewater pretreatment method

A technology for anaerobic hydrolysis and industrial wastewater, applied in anaerobic digestion treatment, reduced water/sewage treatment, chemical instruments and methods, etc. The effect is not ideal, etc., to achieve the effect of improving the sulfur removal effect, shortening the residence time, and increasing the amount of film hanging.

Inactive Publication Date: 2009-01-21
ZHENJIANG WATER IND CORP +1
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  • Summary
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AI Technical Summary

Problems solved by technology

However, the iron-carbon internal electrolysis process itself still has the following defects: ①A large amount of aeration does not make full use of the reducing ability of elemental iron, and the iron consumption is huge, and the economy is poor; ②Wastewater treatment is generally under acidic (pH=2-4) conditions To adjust the waste water, a large amount of acid is required, the amount of dissolved iron is large, and the pH value of the effluent is generally around 5 to 6. In order to meet the requirements of subsequent biological treatment, alkali must be added to neutralize it, which not only increases the treatment cost, but also makes operation and maintenance difficult. cumbersome
However, the catalytic iron internal electrolysis method is mainly aimed at pollutants containing strong electron-withdrawing groups in wastewater, and has an obvious detoxification effect on toxic pollutants. The effect of alkanes is not obvious, especially for those refractory biodegradable substances that cannot be reduced, the treatment effect is not ideal

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, the method of the present embodiment comprises the following steps:

[0018] (1) Mix iron filings and copper filings at a ratio of 1:10, and fill them in a frame device with a density of 0.2×10 3 kg / m 3 , forming a frame-type catalytic iron filter material;

[0019] (2) Place the prepared catalytic filter material in the corridor type hydrolysis acidification reaction tank, the filler volume accounts for 20% of the effective volume of the whole hydrolysis acidification tank, and the water flow mode is advection;

[0020] (3) Pass into an industrial comprehensive wastewater for pretreatment, the water quality is: COD: 500mg / L, BOD 5 : 120mg / L, chromaticity: 512 times, TP: 11mg / L, pH: 7.2. The residence time was 3h, and then the effluent quality was measured, and compared with the effluent treated with catalytic iron reduction alone and the effluent treated with hydrolysis and acidification alone, the results are shown in Table 1.

[0021] Table 1: Coupl...

Embodiment 2

[0023] Embodiment 2, the method of the present embodiment comprises the following steps:

[0024] (1) Electroless copper plating is carried out on the surface of the iron filings pressed into unitized modules, the copper plating rate is 0.3%, and after the copper plating is completed, it is filled in the frame device, and the filling filter material density is 0.1×10 3 kg / m 3 , forming a frame-type catalytic iron filter material;

[0025] (2) The prepared catalytic filter material is placed in the hydrolytic acidification reaction tank, and the filler volume accounts for 70% of the effective volume of the entire hydrolysis acidification tank;

[0026] (3) Leading into a pharmaceutical wastewater, the water quality is: COD: 2500mg / L, 2,4-dinitrotoluene: 220mg / L, hexachloroethane: 40mg / L, Cr 6+ : 200mg / L, and contains macromolecular linear aliphatic hydrocarbons and heterocyclic aromatic compounds and other refractory substances. The residence time was 8h, and then the efflue...

Embodiment 3

[0030] Embodiment 3, the method of the present embodiment comprises the following steps:

[0031] (1) Mix iron filings and copper filings according to the ratio of 1:20, and fill them in the frame device, and the density of the filling filter material is 0.2×10 3 kg / m 3 , forming a frame-type catalytic iron filter material;

[0032] (2) The prepared catalytic iron filter material is placed in the hydrolytic acidification reaction tank, and the volume of the filter material accounts for 40% of the effective volume of the entire hydrolytic acidification tank;

[0033] (3) Pass into the printing and dyeing wastewater which is difficult to biodegrade for pretreatment, the water quality is: COD: 965mg / L, BOD 5 : 152mg / L, influent pH: 8.2, residence time 4h. Then measure the quality of the effluent, and compare it with the effluent treated with catalytic iron reduction alone and the effluent treated with hydrolysis and acidification alone. The results are shown in Table 3:

[00...

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Abstract

The invention belongs to a wastewater treatment technology, relating to a method for coordinated pretreatment of nondegradable industrial wastewater by means of catalyzed iron reduction and anaerobic hydrolysis acidification. The method comprises the following steps: step 1, a catalytic iron filter material is prepared and pressed into a unitized catalytic iron filter material; step 2, a common anaerobic hydrolysis-acidification reaction tank is arranged; step 3, the catalytic iron filter material is put in the anaerobic hydrolysis-acidification reaction tank; and step 4, sewage is fed into the anaerobic hydrolysis-acidification reaction tank, flows through the catalytic iron filter material and is discharged, and the hydraulic residence time is between 3 and 8 hours for anaerobic hydrolysis-acidification reaction. The method not only removes poisonous functional group of poisonous contaminant so as to reduce the toxic action on anaerobe generated by the poisonous contaminant, but also hydrolyzes nonbiodegradable contaminant into easily biodegradable small molecular substance; therefore, the method improves the comprehensive biodegradability of wastewater, and has the advantages of high treatment efficiency and excellent treatment effect.

Description

technical field [0001] The invention belongs to wastewater treatment technology, and relates to a method for synergistic pretreatment of industrial wastewater by catalytic iron reduction and anaerobic hydrolysis acidification, which is used for the pretreatment of refractory industrial wastewater. Background technique [0002] At present, my country's industrial wastewater not only has a large amount of discharge, but also has complex components, and its typical feature is BOD 5 The / COD value is very low, and it contains a large amount of refractory substances and toxic pollutants, which are difficult to biodegrade. Moreover, many industrial wastewaters are generally strongly acidic or alkaline, and have typical difficult-to-treat characteristics such as high concentration, high salinity, and high chroma. In the process of treating refractory industrial organic wastewater, biological treatment is still the main process of various refractory industrial organic wastewater be...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/28C02F1/70
Inventor 胡坚马鲁铭赵冀平吴德礼喻一萍王红武魏保平刘志刚蒋波樊金红
Owner ZHENJIANG WATER IND CORP
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