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Refining and chemical sewage desalting integrated treatment process and device

A technology for refining and chemical sewage and treatment process, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, general water supply saving, etc., can solve problems such as membrane pollution, achieve simple process, control membrane pollution, desalination high rate effect

Active Publication Date: 2014-10-22
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 and chemical sewage desalting integrated treatment process and device
  • Refining and chemical sewage desalting integrated treatment process and device

Examples

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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 a refining and chemical sewage desalting integrated treatment process and device. The process comprises the steps of adding CaO and Na2CO3 into refining and chemical sewage subjected to primary treatment to remove hardness, and regulating the pH value by using acid to obtain primary hardness removed sewage; filtering the primary hardness removed sewage by using a plurality of media and activated carbon to obtain pretreated sewage; carrying out ultrafiltration after mixing the pretreated sewage and sodium hypochlorite to obtain ultra-filtered sewage and filtered matters; carrying out ion exchange treatment after mixing the ultra-filtered sewage and a reducing agent to obtain deionized sewage; carrying out reverse osmosis treatment after mixing the deionized sewage and a scale inhibitor to obtain pure water and concentrated reverse osmosis water. The process also comprises the step of carrying out regeneration treatment on an ion exchange material for ion exchange treatment after removing concentrated organic matters in the concentrated reverse osmosis water through hydrogen peroxide and activated carbon oxidation treatment. The refining and chemical sewage desalting integrated treatment process can be used for increasing the comprehensive water yield and desalting rate of refining and chemical sewage desalting treatment, effectively controlling membrane pollution and realizing the recycle of the refining and chemical 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 Applications(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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