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Treatment method of coking wastewater based on jet biochemical reactor

A biochemical reactor, coking wastewater technology, applied in chemical instruments and methods, biological water/sewage treatment, anaerobic digestion treatment, etc., can solve difficult to guarantee treatment effect, increase operating cost, low volume load and sludge load problems, to achieve the effect of improving efficiency and oxygen utilization, reducing treatment costs, and low sludge production

Active Publication Date: 2019-03-01
WELLE ENVIRONMENTAL GRP CO LTD
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Problems solved by technology

[0004] ⑴, the effluent does not meet the standard
In addition, the biological inhibitors in the influent will also affect the activity of nitrifying bacteria, resulting in a decrease in the denitrification efficiency, and it is difficult for the COD, ammonia nitrogen, and total nitrogen in the effluent to meet the standards at the same time
[0006] (2) Low oxygen transfer efficiency and high energy consumption of the aeration system
[0010] ⑷, in-depth processing is difficult
[0011] The combination of nanofiltration (NF) and reverse osmosis (RO) has strict requirements on the quality of influent water. The quality of biochemical effluent is poor, which will cause aggravated membrane pollution, frequent membrane washing and membrane replacement, and increase operating costs.
[0012] Therefore, as disclosed in CN101913728A, a "biochemical treatment method for coking wastewater", the method includes pretreatment of coking wastewater, sending the pretreated coking wastewater into an anaerobic tank for anaerobic treatment, and treating the anaerobically treated wastewater Send it to an aerobic three-phase fluidized bed for aerobic treatment and other steps. It uses anaerobic treatment and an aerobic three-phase fluidized bed to treat coking wastewater. This method does not have nitrifying liquid backflow, and it is difficult to ensure that the total nitrogen discharge meets the standard.
Secondly, due to the use of upflow anaerobic sludge bed reactor, anoxic carrier fluidized bed biofilm reactor, and two-stage aerobic carrier fluidized bed biofilm reactor to treat coking wastewater, the volume load and sludge load are relatively high. Low, large reactor volume, high investment cost
And CN102897979A disclosed "A kind of treatment method of coking wastewater", which includes the biochemical treatment of coking wastewater and the advanced treatment process of coking wastewater; the biochemical treatment of coking wastewater adopts A2O process, and the advanced treatment of coking wastewater adopts internal electrolysis+Fenton oxidation coagulation Precipitation + activated carbon adsorption method, which reactor and aeration method are not specified in the oxidation section, and the advanced treatment process is simple, it is difficult to guarantee the treatment effect

Method used

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  • Treatment method of coking wastewater based on jet biochemical reactor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The coking wastewater is sent to the regulating tank for water quality and quantity adjustment. The water quality is 4500mg / L of COD, 800mg / L of BOD, 450mg / L of ammonia nitrogen, 700mg / L of volatile phenol, 30mg / L of cyanide, and the total Nitrogen concentration 500mg / L, SS concentration 50mg / L. Pass the coking wastewater in the regulating tank into the air flotation machine, the hydraulic retention time is 1h, the separated effluent is sent to the pre-denitrification tank, and the scum is sent to the sludge dewatering system, and it is tested according to the GB16171-2012 standard. The removal rate of oil and SS in coking wastewater is 90%, the removal rate of COD is 10%, the removal rate of BOD is 10%, the removal rate of ammonia nitrogen is 11%, the removal rate of total nitrogen is 10%, and the removal rate of volatile phenol is 14%. The removal rate of cyanide was 33%.

[0047] The pre-denitrification tank of the effluent after air flotation treatment is fully mix...

Embodiment 2

[0054] The coking wastewater is sent to the regulating tank for water quality and quantity adjustment. The water quality is 4500mg / L of COD, 800mg / L of BOD, 500mg / L of ammonia nitrogen, 700mg / L of volatile phenol, 30mg / L of cyanide, and the total Nitrogen concentration 500mg / L, SS concentration 50mg / L. The coking wastewater in the regulating tank is passed into the air flotation machine, the hydraulic retention time is 1.2h, the separated effluent is sent to the pre-denitrification tank, the scum is sent to the sludge dewatering system, and the mixing is added to the air flotation machine Coagulant and flocculant, according to mass percentage, the addition amount of coagulant is 0.005% of the total amount of coking wastewater, and the addition amount of flocculant is 0.01% of the total amount of coking wastewater. And tested according to the GB16171-2012 standard, the removal rate of oil and SS in coking wastewater after treatment is 92%, the removal rate of COD is 15%, the re...

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Abstract

The invention relates to a coking wastewater treatment method based on a jet flow biochemical reactor. The coking wastewater treatment method comprises steps of air flotation pretreatment, pre-denitrification treatment, treatment with a biological reactor, degasification treatment, rear-denitrification treatment, ultra-filtration treatment and reverse osmosis / nanofiltration treatment. The coking wastewater treatment method is reasonable in overall procedure design, a biochemical treatment process and a membrane depth treatment process are combined, active sludge is retained in an external ultra-filtration manner, external ultra-filtration, pre-denitrification treatment, treatment with the biochemical reactor and a rear-denitrification treatment process A / O / A form an MBR process, the organic volume load of a treatment system can be increased, the combined process is good in treatment effect and relatively low in investment and operation cost, the effluent can meet recycling standards, and the investment and operation cost is relatively low.

Description

technical field [0001] The invention relates to a coking wastewater treatment method based on a jet biochemical reactor, belonging to the technical field of industrial wastewater treatment. Background technique [0002] During the production process of coking and gas production, coal chemical enterprises discharge a large amount of coking wastewater with complex components, high organic concentration and refractory degradation. Coking wastewater mainly contains inorganic pollutants such as cyanide, thiocyanide, ammonia nitrogen, and heavy metals, and organic pollutants such as oil, volatile phenols, and polycyclic aromatic hydrocarbons. In 2012, my country promulgated the "Discharge Standards for Pollutants in the Coking Chemical Industry" (GB16171-2012), which put forward higher requirements for the treatment and discharge of coking wastewater, and stricter control over the discharge of organic pollutants and nitrogen. It stipulates that since January 1, 2015, the pollutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/24C02F1/441C02F1/442C02F1/444C02F3/00C02F3/121C02F3/28C02F9/00
Inventor 朱伟青方辉李月中乐晨张怀玉韩颖陈赟浦燕新
Owner WELLE ENVIRONMENTAL GRP CO LTD
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