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Method and system for recycling petrochemical wastewater

A technology of petrochemical wastewater and quicklime, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problem of using petrochemical wastewater without a membraneless electrodeionization system, affecting resin regeneration efficiency, and poor resin conductivity to avoid hydroxide precipitation, ensure the quality of effluent water, and prevent resin pollution

Active Publication Date: 2022-03-22
NINGBO POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing technology, the effect of filling the traditional resin layer structure in the membraneless electrodeionization system to treat heavy metal wastewater is not ideal, and the OH produced during the electric regeneration process - It will form hydroxide precipitates with heavy metal ions, thereby blocking the resin channel; on the other hand, the filled resin has poor conductivity, which often affects the regeneration efficiency of the resin
And in the existing technology, there is no case where the membraneless electrodeionization system is applied to the treatment of petrochemical wastewater

Method used

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  • Method and system for recycling petrochemical wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The copper and nickel-containing wastewater produced by a C9 petroleum resin enterprise is treated by this method and system, including the following steps:

[0037] (1) The raw water enters the regulating tank device, and the regulating tank is used to adjust the water quality and quantity;

[0038] (2) The effluent from the regulating tank enters the degreasing tank through the lifting pump, adds compressed air and degreasing agent, and after being fully mixed and reacted by the agitator, the oily substances are carried up by the microbubbles and stay for 25 minutes to remove the oily substances;

[0039](3) The effluent from the oil removal tank enters the neutralization coagulation sedimentation tank, and at the same time puts in quicklime and NaOH to adjust the pH to 8.5-9, and adds flocculants PAC 10-18mg / L, PAM 0.4-0.8mg / L, and the effluent enters after precipitation The primary filter, after filtering out solid matter, the filtered water enters the intermediate ...

Embodiment 2

[0044] The copper and nickel-containing wastewater produced by a C9 petroleum resin enterprise is treated by this method and system, including the following steps:

[0045] (1) The raw water enters the regulating tank device, and the regulating tank is used to adjust the water quality and quantity;

[0046] (2) The effluent from the adjustment pool enters the degreasing tank through the lifting pump, and then adds compressed air and degreaser. After fully mixed and reacted by the agitator, the oily substances are carried up by the micro-bubbles and stay for 25 minutes to remove the oily substances;

[0047] (3) The effluent from the oil removal tank enters the neutralization coagulation sedimentation tank, at the same time, quicklime and NaOH are put in to adjust the pH to 8.5, and flocculants PAC 10mg / L and PAM 0.4mg / L are added. After precipitation, the effluent enters the primary filter and is filtered After removing the solid matter, filter the water into the intermediate ...

Embodiment 3

[0052] The copper and nickel-containing wastewater produced by a C9 petroleum resin enterprise is treated by this method and system, including the following steps:

[0053] (1) The raw water enters the regulating tank device, and the regulating tank is used to adjust the water quality and quantity;

[0054] (2) The effluent from the adjustment pool enters the degreasing tank through the lifting pump, and then adds compressed air and degreaser. After fully mixed and reacted by the agitator, the oily substances are carried up by the micro-bubbles and stay for 25 minutes to remove the oily substances;

[0055] (3) The effluent from the oil removal tank enters the neutralization coagulation sedimentation tank, at the same time put in quicklime and NaOH to adjust the pH to 8.6, add flocculant PAC 15mg / L, PAM 0.6mg / L, after precipitation, the effluent enters the primary filter, After removing the solid matter, filter the water into the intermediate pool;

[0056] (4) The lifting pu...

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Abstract

The invention discloses a method and a system for recycling petrochemical wastewater. Comprising the following steps: (1) introducing raw petrochemical wastewater into an adjusting tank device, and adjusting the water quality and water quantity by using an adjusting tank; (2) the effluent of the adjusting tank enters an oil removal tank through a lifting pump, compressed air and an oil removal agent are added, and oil substances are removed; (3) enabling effluent of the oil removal tank to enter a neutralization coagulative precipitation tank, adding quick lime, NaOH, and flocculants PAC and PAM, removing substances such as AlCl3, BF3, suspended solids and colloids, filtering out solid substances, and enabling filtered water to enter an intermediate water tank; (4) feeding filtered water in the middle water tank into a precision filter by using a lifting pump, and removing residual non-ionic impurities and part of ionic substances as pretreatment for deep treatment; and (5) the effluent treated by the precision filter enters a membrane-free electrodeionization device, residual heavy metal plasma substances in the wastewater are removed, and the treated clear water meets the recycling requirement.

Description

technical field [0001] The invention relates to the field of petrochemical wastewater treatment, in particular to a method and system for advanced treatment of petrochemical wastewater. Background technique [0002] The petrochemical industry is a pillar industry of the country, which can produce chemical raw materials such as ethylene, propylene, and benzene, and synthesize plastics, rubber, resin and other products. However, a large amount of waste water will be generated in the process of petrochemical production. On the other hand, in the petrochemical industry, BF is widely used 3 , AlCl 3 Acidic catalysts such as nickel, copper, manganese and other metal catalysts lead to heavy metals and acidic substances in petrochemical wastewater. If not handled properly, it will pose a great threat to aquatic ecology and human health. The current methods for treating petrochemical wastewater containing heavy metals mainly include chemical precipitation, biochemical method, adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01J49/30C02F103/34C02F101/20
CPCC02F9/00B01J49/30C02F2103/34C02F2101/20C02F1/5236C02F1/66C02F1/001C02F1/42C02F2001/425C02F1/40C02F2301/08
Inventor 申小兰陈如君彭振博李浩
Owner NINGBO POLYTECHNIC
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