Pretreatment method of waste emulsion

A waste emulsion and pretreatment technology, applied in chemical instruments and methods, pathogenic microorganism wastewater treatment, water/sewage treatment, etc., can solve the problems of low operating costs, high investment and operating costs, and low automation , to achieve the effects of small footprint, short response time and high degree of automation

Inactive Publication Date: 2020-07-31
浙江美纳环保科技有限公司
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of pretreatment method of waste emulsion in view of the technical problems of high oil content and high COD waste emulsion treatment in the prior art, which have high investment and operating costs, low degree of automation and secondary pollution. The method for treating waste emulsion has moderate one-time investment, low operating cost, high degree of automation, clear effluent, taking into account other process wastewater of the enterprise, and realizes one-time treatment of wastewater without thick liquid and secondary pollution. After the waste emulsion of the present invention The wastewater obtained after the pretreatment method can directly enter the follow-up biochemical system for sewage discharge treatment up to standard

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment one: if figure 1 As shown, the COD of the waste emulsion raw water is 80000mg / L, the suspended solids (SS) is 1000mg / L, the petroleum is 5000mg / L, the pH is 6, and the BOD / COD is 0.1.

[0045] Adjust the pH value of the raw water of the waste emulsion to 4, and add 3g / L FeSO 4 , into the electrochemical reaction device to carry out a primary demulsification reaction, the anode of the electrochemical reaction device uses a titanium-based lead dioxide coating electrode, and the cathode uses a stainless steel electrode; the distance between the electrode plates is 2 cm, and the current density of the electrode plates is 10mA / cm 2 , the power supply is a high-frequency pulsed DC power supply, the pulse frequency is 5000Hz, the duty cycle is 50%, the aeration volume at the bottom is twice the flow rate of the wastewater, and the residence time of the wastewater in the electrocatalytic oxidation device is 30 minutes. The waste emulsion after the demulsification r...

Embodiment 2

[0056] Embodiment two: if figure 2As shown, the COD of the waste emulsion raw water is 150000mg / L, the suspended solids (SS) is 2000mg / L, the petroleum is 10000mg / L, the pH is 9, and the BOD / COD is 0.1.

[0057] Adjust the pH value of the raw water of the waste emulsion to 6, and add 10g / L of FeSO 4 , into the electrochemical reaction device to carry out a primary demulsification reaction, the anode of the electrochemical reaction device uses a titanium-based tin dioxide coating electrode, and the cathode uses a graphite electrode; the distance between the electrode plates is 1 cm, and the current density of the electrode plates is 100mA / cm 2 , the power supply is a high-frequency pulsed DC power supply, the pulse frequency is 20000Hz, the duty cycle is 100%, the bottom aeration volume is twice the wastewater flow rate, and the residence time of the wastewater in the electrocatalytic oxidation device is 10 minutes. The waste emulsion after the demulsification reaction enter...

Embodiment 3

[0066] Embodiment three: as image 3 As shown, the COD of the waste emulsion raw water is 120000mg / L, the suspended solids (SS) is 1500mg / L, the petroleum is 1000mg / L, the pH is 7, and the BOD / COD is 0.17.

[0067] Adjust the pH value of the raw water of the waste emulsion to 5, and add 6g / L of FeSO 4 , into the electrochemical reaction device to carry out a primary demulsification reaction, the anode of the electrochemical reaction device uses a titanium-based lead dioxide coating electrode, and the cathode uses a stainless steel electrode; the distance between the electrode plates is 2 cm, and the current density of the electrode plates is 50mA / cm 2 , the power supply is a high-frequency pulsed DC power supply, the pulse frequency is 10000Hz, the duty cycle is 10%, the aeration volume at the bottom is 1 times the flow rate of the wastewater, and the residence time of the wastewater in the electrocatalytic oxidation device is 20 minutes. The waste emulsion after the demulsi...

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Abstract

The invention discloses a pretreatment method of waste emulsion, and belongs to the technical field of sewage treatment. The pretreatment method of the waste emulsion comprises the following steps: sequentially carrying out primary electrochemical demulsification reaction, primary sludge-water separation, electro-catalytic oxidation reaction, sludge-water separation, and / or electro-Fenton reaction, and sludge-water separation, or carrying out electro-Fenton reaction and then electro-catalytic oxidation reaction, iron-carbon micro-electrolysis reaction, Fenton reaction and sludge-water separation on waste emulsion stock solution, and enabling obtained wastewater to enter a biochemical reaction system for up-to-standard sewage discharge treatment. The pretreatment method of the waste emulsion is moderate in one-time investment, low in operation cost, high in automation degree and clear in effluent, and gives consideration to wastewater of other processes of enterprises; one-time treatment of the wastewater is achieved, concentrated liquid and secondary pollution are avoided, and the wastewater treated through the wastewater emulsion pretreatment method can directly enter a subsequentbiochemical system to be subjected to up-to-standard sewage discharge treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to an industrial wastewater treatment method, in particular to a pretreatment method of waste emulsion. Background technique [0002] Emulsions are widely used in steel rolling, mechanical processing industries, and metal processing industries, mainly for cleaning, rust prevention, lubrication, and cooling, but must be replaced after multiple cycles. This type of wastewater belongs to high-concentration organic wastewater, BOD / COD is far less than 0.1, and its biodegradability is extremely poor. It is one of the most difficult types of industrial wastewater to treat, and the treatment cost is very high. At present, the emulsion treatment price of hazardous waste disposal units with treatment qualifications on the market is generally between 3,000-4,000 yuan / ton. [0003] For the treatment of waste emulsion, there are currently the following methods to achieve standard discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/22C02F101/20
CPCC02F9/00C02F1/463C02F1/4672C02F1/5236C02F1/56C02F1/461C02F1/725C02F1/722C02F2209/005C02F2101/20C02F2101/22C02F2103/003
Inventor 陈敏感
Owner 浙江美纳环保科技有限公司
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