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
  • Abstract
  • Description
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  • Application Information

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 bi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Embodiment 1. The method of this embodiment includes the following steps:

[0018] (1) Mix the iron filings and copper filings in a ratio of 1:10, and pack them in the frame device, and the density of the packing filter material is 0.2×10 3 kg / m 3 , Constitute a frame-type catalytic iron filter material;

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

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

...

Example Embodiment

[0023] Embodiment 2. The method of this embodiment includes the following steps:

[0024] (1) Electroless copper plating is performed on the surface of the iron filings pressed into the unitized module. The copper plating rate is 0.3%. After the copper plating is completed, it is filled in the frame device with a density of 0.1×10. 3 kg / m 3 , Constitute a frame-type catalytic iron filter material;

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

[0026] (3) Enter a certain 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 difficult-to-degrade substances. The residence time was 8h, and then the effluent quality was meas...

Example Embodiment

[0030] Embodiment 3. The method of this embodiment includes the following steps:

[0031] (1) Mix the iron filings and copper filings at a ratio of 1:20, and pack them into the frame device, with a density of 0.2×10 3 kg / m 3 , Constitute a frame-type catalytic iron filter material;

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

[0033] (3) Enter the non-biodegradable printing and dyeing wastewater for pretreatment, the water quality is: COD: 965mg / L, BOD 5 :152mg / L, influent pH: 8.2, residence time is 4h. Then the effluent quality was measured and compared with the effluent treated by catalytic iron reduction alone and the effluent treated by hydrolysis and acidification alone. The results are shown in Table 3:

[0034] Table 3: Catalytic iron reduction and anaerobic hydrolysis acidification syne...

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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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