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Method for treating high-concentration chemical wastewater

A technology for chemical wastewater and treatment methods, which is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Insufficient and other problems, to achieve the effect of reducing the dosage of chemicals, compact reactor structure, and good sludge retention effect

Inactive Publication Date: 2015-08-12
NANTONG DAHENG ENVIRONMENTAL ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical wastewater not only has the characteristics of high CODCr, high toxicity, and poor biodegradability, especially the comprehensive chemical wastewater in chemical parks, which has a wide range of sources, involves many chemical industries, fluctuates greatly in water quality and quantity, and has complex and uncertain wastewater compositions. Most of them have the characteristics of high pH, ​​deep color, high ammonia nitrogen, high salinity, high content of toxic substances, large changes in water quality and quantity, and poor biodegradability. Conventional physicochemical and biochemical treatments are difficult to meet the discharge requirements. For a long time, the project compliance rate Seriously insufficient

Method used

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  • Method for treating high-concentration chemical wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown: the specific process is as follows:

[0023] (a) After the wastewater passes through the grid, part of the suspended matter is removed and enters the regulating tank, and then enters the iron-carbon micro-electrolytic cell for micro-electrolysis treatment; the amount of homogeneous particle filler added is 4 times the flow rate of the wastewater.

[0024] (b) Then enter the FT oxidation pool for indirect liquefaction and oxidation of coal / natural gas, specifically: adopt a hierarchical reaction method for oxidation, add Fenton oxidizer in points and sections in the oxidation pool, and the dosage of Fenton oxidizer is wastewater 3 to 5 times the hourly flow.

[0025] (c) The wastewater from the FT oxidation tank enters the coagulation sedimentation tank, and the flocculant PAM with a concentration of 0.1% is added, and the slag and mud produced by the precipitation are transferred to the sludge thickening tank, and the sewage enters the forced ci...

Embodiment 2

[0032] On the basis of Example 1, (a) Waste water passes through the grid to remove part of the suspended matter and enters the regulating tank, and then enters the iron-carbon micro-electrolytic cell for micro-electrolysis treatment; the amount of homogeneous particle filler added is the flow rate of the waste water 6 times.

[0033] (b) Then enter the FT oxidation pool for indirect liquefaction and oxidation of coal / natural gas, specifically: adopt a hierarchical reaction method for oxidation, add Fenton oxidizer in points and sections in the oxidation pool, and the dosage of Fenton oxidizer is wastewater 3 to 5 times the hourly flow.

[0034] (c) The wastewater from the FT oxidation tank enters the coagulation sedimentation tank, and the flocculant PAM with a concentration of 0.1% is added, and the slag and mud produced by the precipitation are transferred to the sludge thickening tank, and the sewage enters the forced circulation UASB tank for further processing. Anaerobi...

Embodiment 3

[0041] On the basis of Example 1, (a) Waste water passes through the grid to remove part of the suspended matter and enters the regulating tank, and then enters the iron-carbon micro-electrolytic cell for micro-electrolysis treatment; the amount of homogeneous particle filler added is the flow rate of the waste water 5 times.

[0042] (b) Then enter the FT oxidation pool for indirect liquefaction and oxidation of coal / natural gas, specifically: adopt a hierarchical reaction method for oxidation, add Fenton oxidizer in points and sections in the oxidation pool, and the dosage of Fenton oxidizer is wastewater 3 to 5 times the hourly flow.

[0043] (c) The wastewater from the FT oxidation tank enters the coagulation sedimentation tank, and the flocculant PAM with a concentration of 0.1% is added, and the slag and mud produced by the precipitation are transferred to the sludge thickening tank, and the sewage enters the forced circulation UASB tank for further processing. Anaerobi...

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Abstract

The invention discloses a method for treating high-concentration chemical wastewater. The method comprises a pre-treatment step, an up-flow type anaerobic sludge bed treatment step and a contact oxidation treatment step in sequence. The method has the innovation point that the pre-treatment step comprises an iron-carbon micro-electrolysis step and a coal / natural indirect liquidation oxidization step; the contact oxidation treatment step comprises an anaerobic treatment step and a two-stage aerobic treatment step; the first-stage aerobic treatment step in the two-stage aerobic treatment step comprises an anoxic and biochar-process activated sludge combined treatment step. According to the method for treating high-concentration chemical wastewater, the operation feasibility is improved, the labor intensity is reduced, the filler is enabled to be in a suspension state without being blocked and plugged by controlling the grain size of the filler and operation parameters of an aeration system and an inner circulating system, the iron powder and the carbon powder are released to the sewage in a facilitated mode, the gas phase, the liquid phase and the solid phase are completely contacted, and the treatment efficiency is improved.

Description

technical field [0001] The invention relates to a method for treating high-concentration chemical wastewater, which belongs to the field of industrial wastewater treatment. Background technique [0002] With the increasing demand for petrochemical products, the total scale of chemical plants is constantly expanding, and the pressure on the environment is also increasing year by year. Chemical wastewater not only has the characteristics of high CODCr, high toxicity, and poor biodegradability, especially the comprehensive chemical wastewater in chemical parks, which has a wide range of sources, involves many chemical industries, fluctuates greatly in water quality and quantity, and has complex and uncertain wastewater compositions. Most of them have the characteristics of high pH, ​​deep color, high ammonia nitrogen, high salinity, high content of toxic substances, large changes in water quality and quantity, and poor biodegradability. Conventional physicochemical and biochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 沈晓东陈建宋海云周志刚王东升黄振宇曹斌陈跃曹鑫杰
Owner NANTONG DAHENG ENVIRONMENTAL ENG CO LTD
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