Method for physicochemical and biochemical combined treatment of coking wastewater

A coking wastewater and combined treatment technology, which is applied in the fields of chemical instruments and methods, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of great harm to the human body, lower biochemical treatment efficiency, and "difficult discharge standards for coking wastewater treatment process" etc. to achieve high COD degradation efficiency, reduce ozone treatment costs, and reduce the generation of concentrated water

Inactive Publication Date: 2020-08-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the pollutants have high concentrations, are harmful to the human body, can cause cancer, teratogenicity and mutagenesis, and have long-term impacts on environmental ecological security.
At present, the existing coking wastewater treatment processes at home and abroad can hardly meet the national standard discharge requirements stably
For example, a coking plant in Henan has high salt content, and the concentration of chloride ions is as high as 1.8g/L, which will cause corrosion to the metal pipes of the test device, which will further cause the pipe diameter to become smaller and the system pressure to increas

Method used

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  • Method for physicochemical and biochemical combined treatment of coking wastewater
  • Method for physicochemical and biochemical combined treatment of coking wastewater
  • Method for physicochemical and biochemical combined treatment of coking wastewater

Examples

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Embodiment 1

[0057] A physical, chemical and biochemical combined treatment method for coking wastewater, the main indicators of coking wastewater influent: pH is 9.4, COD concentration is 2736mg / L, ammonia nitrogen concentration is 155mg / L, total phosphorus concentration is 2.57mg / L, the treatment method is as follows figure 1 As shown, the processing system as figure 2 , image 3 As shown, it specifically includes the following steps:

[0058] (1) The coking wastewater enters the chemical dechlorination pool 2 after adjusting the pH to 10 through the regulating pool 1, and calcium oxide and sodium metaaluminate are added in the chemical dechlorination pool 2, and the n(Ca):n(Al):n( Cl) molar ratio is 15:4.5:1, and stirring 1h at 400r / min speed, after filtering to remove sediment, obtain the coking waste water of primary dechlorination;

[0059] This process makes calcium oxide and sodium metaaluminate react with chloride ions in coking wastewater to form calcium aluminum chloride compou...

Embodiment 2

[0078] A physical, chemical and biochemical combined treatment method for coking wastewater, the main indicators of coking wastewater influent: pH is 9.4, COD concentration is 2736mg / L, ammonia nitrogen concentration is 155mg / L, total phosphorus concentration is 2.57mg / L, the treatment method is as follows figure 1 As shown, the processing system as figure 2 , image 3 As shown, it specifically includes the following steps:

[0079] (1) The coking wastewater enters the chemical dechlorination pool 2 after adjusting the pH to 10 through the regulating pool 1, and calcium oxide and sodium metaaluminate are added in the chemical dechlorination pool 2, and the n(Ca):n(Al):n( Cl) molar ratio is 15:4.5:1, and stirring 1h at 400r / min speed, after filtering to remove sediment, obtain the coking waste water of primary dechlorination;

[0080] This process makes calcium oxide and sodium metaaluminate react with chloride ions in coking wastewater to form calcium aluminum chloride comp...

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Abstract

The invention discloses a method for physicochemical and biochemical combined treatment of coking wastewater. The method comprises the following steps: adding a calcium source and sodium metaaluminateinto coking wastewater and stirring, removing precipitates, carrying out micro-nano ozone catalytic oxidation reaction on the coking wastewater subjected to preliminary dechlorination, carrying out A2O biochemical reaction on coking wastewater obtained after the pretreatment is completed to obtain biochemical effluent, carrying out coagulating sedimentation, carrying out primary reverse osmosis treatment to obtain clear liquid, namely wastewater meeting the discharge standard, carrying out adsorption treatment on the generated membrane treatment concentrated liquid by utilizing fly ash, and returning to the step (1) to carry out physicochemical and biochemical combined treatment of the next cycle. The method is good in coking wastewater treatment effect and high in treatment efficiency, the effluent index can completely meet the national current discharge standard, and the requirement of national standard discharge can be stably met for a long time.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for combined physical, chemical and biochemical treatment of coking waste water. Background technique [0002] Coking wastewater mainly refers to the wastewater generated from coal pyrolysis, gas purification and benzene refining processes. Due to the influence of various factors such as the nature of raw coal and complex processing procedures, there are hundreds of organic pollutants in the coking wastewater, which is a typical high-concentration organic wastewater that is toxic, harmful and difficult to degrade. There are not only a large amount of suspended solids and Water-soluble inorganic compounds, including phenolic compounds, benzene and its derivatives, pyridine, etc. There are hundreds of organic compounds. Most of the pollutants have high concentrations, are harmful to the human body, can cause cancer, teratogenicity and mutagenesis...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/34C02F101/16
CPCC02F1/281C02F1/441C02F1/442C02F1/5236C02F1/56C02F1/58C02F1/66C02F1/725C02F1/78C02F3/30C02F3/302C02F9/00C02F2101/16C02F2103/34
Inventor 谢建平冯宁宁武海艳刘新星邱冠周
Owner CENT SOUTH UNIV
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