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Coking wastewater treatment method

A coking wastewater and treatment method technology, which is applied in special compound water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of human health hazards, degradation of biochemical properties, and wastewater that cannot meet national discharge standards, etc.

Pending Publication Date: 2021-03-26
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The organic pollutants contained in coking wastewater seriously inhibit the growth of microorganisms and normal metabolic activities, resulting in a decline in its biochemical properties, making it very difficult to treat; at the same time, it contains a large amount of carcinogenic polycyclic aromatic hydrocarbons, which not only cause serious pollution to water bodies, but also Great harm to human health
Activated sludge process and A are widely used in the prior art 2 O process treats coking wastewater, but because coking wastewater contains organic matter that is difficult to be biodegraded, and the refractory organic matter with biotoxicity will inhibit the growth of nitrifying bacteria in a relatively high concentration range, so that activated sludge method and A 2 The wastewater treated by the O process still cannot meet the national discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add a flocculant (magnesium chloride and potassium dihydrogen phosphate with a molar ratio of 1:1) to the coking wastewater, the concentration of the flocculant is 30 mg / L, stir and mix well and let it stand for 8 hours to remove the flocs to obtain pretreated coking wastewater;

[0033] (2) After pretreatment, coking wastewater is inoculated with activated sludge (the volume ratio of coking wastewater and activated sludge is 5:1), and glucose, ammonium chloride, and dihydrogen phosphate are added according to the ratio of COD:N:P=100:5:1 Potassium is carried out stuffy exposure 12h, and the dissolved oxygen in the environment is controlled at 5mg / L during the process, and the supernatant is taken;

[0034] (3) The supernatant of step (2) is connected to direct current, with Ti-RuO 2 / IrO 2 As the anode material, the titanium plate is used as the cathode material, and iron plates are embedded at equal distances between the cathode and the anode to construct an elec...

Embodiment 2

[0037] (1) Add a flocculant (magnesium chloride and potassium dihydrogen phosphate with a molar ratio of 1:1) to the coking wastewater, the concentration of the flocculant is 20 mg / L, stir and mix well and let it stand for 12 hours to remove the flocs to get pretreated coking wastewater;

[0038] (2) After pretreatment, coking wastewater is inoculated with activated sludge (the volume ratio of coking wastewater and activated sludge is 5:1), and glucose, ammonium chloride, and dihydrogen phosphate are added according to the ratio of COD:N:P=100:5:1 Potassium was subjected to stuffy exposure for 12 hours, and the dissolved oxygen in the environment was controlled at 10mg / L during the process, and the supernatant was taken;

[0039] (3) The supernatant of step (2) is connected to direct current, with Ti-RuO 2 / IrO 2 As the anode material, the titanium plate is used as the cathode material, and iron plates are embedded at equal distances between the cathode and the anode to const...

Embodiment 3

[0042] (1) Add a flocculant (magnesium chloride and potassium dihydrogen phosphate with a molar ratio of 1:1) to the coking wastewater, the concentration of the flocculant is 40 mg / L, stir and mix well and let it stand for 8 hours to remove the flocs to get pretreated coking wastewater;

[0043] (2) After pretreatment, coking wastewater is inoculated with activated sludge (the volume ratio of coking wastewater and activated sludge is 5:1), and glucose, ammonium chloride, and dihydrogen phosphate are added according to the ratio of COD:N:P=100:5:1 Potassium was exposed for 12 hours, and the dissolved oxygen in the environment was controlled at 8 mg / L during the process, and the supernatant was taken;

[0044] (3) The supernatant of step (2) is connected to direct current, with Ti-RuO 2 / IrO 2 As the anode material, the titanium plate is used as the cathode material, and iron plates are embedded at equal distances between the cathode and the anode to construct an electrochemica...

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Abstract

The invention discloses a coking wastewater treatment method which comprises the following steps: adding a flocculating agent into coking wastewater subjected to preliminary precipitation, uniformly stirring and mixing, standing, and removing flocculate to obtain pretreated coking wastewater; inoculating activated sludge, adding a carbon source, a nitrogen source and a phosphorus source, carryingout stuffy aeration to obtain a supernatant, introducing direct current, taking Ti-RuO2 / IrO2 as an anode material, taking a titanium plate as a cathode material, and embedding iron plates between a cathode and an anode at equal intervals to construct an electrochemical double-electrolysis reaction system for electrochemical treatment; adjusting the pH value, adding a flocculating agent, uniformlystirring and mixing, standing for layering, and carrying out solid-liquid separation. Through flocculant treatment before activated sludge treatment, construction of an electrochemical double-electrolysis reaction system, electrochemical treatment, micro-aeration operation in the activated sludge treatment process and further flocculation operation after electrochemical treatment, the technical purpose of greatly improving the wastewater treatment efficiency is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a coking wastewater treatment method. Background technique [0002] Coking wastewater is a high-concentration, non-ideal system, heterogeneous phase containing volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen produced in the process of coal-to-coke, gas purification, and coking product recovery. Refractory organic industrial wastewater, its BOD 5 The / COD value is generally 0.28-0.32, with poor biodegradability and difficult biodegradation. Coking wastewater has a wide variety of pollutants, complex components, and contains a large number of refractory substances. The pollutants contained in it are mainly divided into inorganic pollutants and organic pollutants. There are many kinds of organic pollutants. The main forms are phenol, p-cresol, Phthalene and its homologues, as well as heterocyclic compound...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30C02F103/34
CPCC02F9/00C02F2103/34C02F1/5236C02F2001/007C02F3/12C02F2305/06C02F2209/06C02F2201/4617C02F1/46109C02F2001/46133C02F1/66C02F2301/08C02F2201/4619C02F2209/22C02F2101/30
Inventor 王建辉赵可闫娇任加慧叶志浩祁欣张彬
Owner JILIN JIANZHU UNIVERSITY
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