Refining wastewater desalination integrated treatment process and device

A refinery sewage and treatment process technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply conservation, etc., can solve membrane pollution and other problems, achieve simple process, reduce frequency, and desalination rate high effect

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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Problems solved by technology

In China, ultrafiltration reverse osmosis, as the main technology for desalination and reuse of circulating cooling water and filtered feed water, has been applied in Dalian Petrochemical, Dagang Petrochemical, Qilu Petrochemical and other enterprises, but there are organic and inorganic salt scaling in operation The problem of membrane fouling

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  • Refining wastewater desalination integrated treatment process and device
  • Refining wastewater desalination integrated treatment process and device

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Embodiment

[0045] This example provides an integrated refinery sewage desalination treatment process, which is applied and studied in Lanzhou Petrochemical. The process is as follows figure 1 shown, including the following steps:

[0046] Step 1: Add CaO and Na to the primary treated refinery wastewater 2 o 3 Remove the hardness, settle in the clarifier, remove the sediment, adjust the pH with acid, and get the preliminary hardness-removed sewage;

[0047] Step 2, filtering the preliminary dehardened sewage in a multimedia filter unit, and then filtering in an activated carbon filter unit to obtain pretreated sewage;

[0048] Step 3: Mix the pretreated sewage and sodium hypochlorite, first pass through the security filter unit for prefiltration, and then perform ultrafiltration in the ultrafiltration unit, and the ultrafiltration treated sewage is backwashed by the backwash pump to the ultrafiltration membrane, and then Enter the ultrafiltration water tank for buffering, and then perf...

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Abstract

The invention provides an integrated treatment process and device for desalination of refinery sewage. The process includes: adding CaO and Na to the primary treated refinery wastewater 2 CO 3 Remove the hardness and adjust the pH with acid to obtain the preliminary hardness-removed sewage; use multi-media filtration and activated carbon to filter the preliminary hardness-removed sewage to obtain pretreated sewage; mix the pretreated sewage and sodium hypochlorite for ultrafiltration to obtain ultrafiltration Sewage and filtrate; mix ultrafiltration sewage with reducing agent and perform ion exchange treatment to obtain deionized sewage; mix deionized sewage with antiscalant and perform reverse osmosis treatment to obtain pure water and reverse osmosis concentrated water. The process also includes the step of regenerating the ion exchange material used in the ion exchange treatment after the reverse osmosis concentrated water is oxidized with hydrogen peroxide-activated carbon to remove concentrated organic matters. The invention can improve the comprehensive water collection rate and desalination rate of desalination treatment of refinery sewage, effectively control membrane pollution, and realize resource reuse of refinery sewage.

Description

technical field [0001] The invention relates to a refinery wastewater desalination integrated treatment process and device, belonging to the technical field of oil and gas field surface engineering. Background technique [0002] The petrochemical industry is one of the five major water-consuming industries in my country. At present, the biological treatment of refinery sewage in my country generally adopts two-stage aerobic or anaerobic (A / O) process, and the effluent quality can basically meet the internationally recognized discharge standards. Standard, but not directly reusable. For some wastewater with high salt content, high alkalinity, high hardness, and high corrosive ion content, in addition to considering the treatment of polluting components, these ions must also be properly treated so that the circulating water system after sewage reuse No fouling and no corrosion under high concentration ratio. [0003] Reverse osmosis is a desalination treatment technology that...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 吴百春罗臻张晓飞张华李婷邓皓刘光全刘译阳宋磊杨雪莹王毅霖
Owner PETROCHINA CO LTD
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