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Alkali residue waste water treating method

A technology for alkali slag wastewater and treatment methods, which is applied in water/sewage treatment, biological water/sewage treatment, multi-stage water/sewage treatment, etc., and can solve problems such as the influence of water production rate in the reuse system and the impact on stable and up-to-standard operation. To achieve the effect of convenient operation, strong practicability and simple process

Inactive Publication Date: 2017-05-10
辽宁海润环保技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the salt content in the alkali residue wastewater is very high, it is the main source of salt concentration in the sewage produced by the refinery. Therefore, after the pretreated alkali residue wastewater enters the sewage treatment device, it will increase the total salt load of the sewage treatment device and affect the stability. Standard operation will have an impact on the water production rate of the subsequent reuse system of the sewage treatment plant

Method used

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  • Alkali residue waste water treating method

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Effect test

Embodiment 1

[0026] A treatment method for alkali slag wastewater, comprising the steps of:

[0027] 1. Collect the alkali slag water into the alkali slag tank for storage, and send it to the electrolytic air flotation device through the lifting pump, add 200 mg / L polyaluminum chloride and 3 mg / L polymer coagulant polyacrylamide.

[0028] The electrolytic air flotation device uses insoluble electrodes, the anode is titanium plate coated iridium dioxide, and the cathode is stainless steel 316L. Under the action of a direct current electric field, the water molecules and sodium chloride are electrolyzed, and O is precipitated at the anode. 2 and Cl 2 , H is precipitated at the cathode 2 . The particle size of the bubbles produced by electrolysis is very small, with a particle size of 10-20 microns. Therefore, the bubbles produced by electrolysis have a higher ability to intercept impurity particles than dissolved air flotation and mechanical impeller air flotation, and the floating capaci...

Embodiment 2

[0042]Refinery alkali residue wastewater, daily treatment capacity 10t, main pollutant indicators COD200000mg / l, sulfide 26000mg / l, volatile phenol 3850mg / l, oil 260mg / l, pH14, NaOH content 3%, total solids concentration TDS150g / l , adopt the method of the present invention to process.

[0043] The alkali slag wastewater is first stored in the alkali slag tank to adjust the water quality and quantity, and then enters the electrolytic air flotation device through the lift pump, and adds 200 mg / L polyaluminium chloride and 3 mg / L polymer coagulant polyacrylamide, After electrolytic air flotation treatment, the oily substance is reduced to below 25mg / l.

[0044] The wastewater after electrolytic air flotation treatment enters the biochemical treatment device, and the total volume of the biochemical treatment device is 400m 3 According to the concentration of 1200mg / l, add 480kg of high-efficiency complex flora after screening and cultivation. The water ratio of alkali residue w...

Embodiment 3

[0048] Refinery alkali residue wastewater, daily treatment capacity 12t, main pollutant indicators COD350000mg / l, sulfide 32000mg / l, volatile phenol 1850mg / l, oil 390mg / l, pH14, NaOH content 3.5%, total solids concentration TDS180g / l , adopt the method of the present invention to process.

[0049] The alkali slag wastewater is first stored in the alkali slag tank to adjust the water quality and quantity, and then enters the electrolytic air flotation device through the lift pump, and adds 350 mg / L polyaluminium chloride and 6 mg / L polymer coagulant polyacrylamide, After electrolytic air flotation treatment, the oily substances are reduced to below 30mg / l.

[0050] The wastewater after electrolytic air flotation treatment enters the biochemical treatment device, and the total volume of the biochemical treatment device is 800m 3 According to the concentration of 1500mg / l, the high-efficiency complex flora after screening and cultivation is added for 1200kg. The water volume of...

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Abstract

The invention relates to an alkali residue waste water treating method. An alkali residue tank, an electrolytic air-flotation device, a biochemical treatment device, a fine filter, a disc-tube membrane and reverse osmosis membrane concentrating device and a spray drying device are used in the method, and a bioaugmentation technology is used for the biochemical treatment device. The bioaugmentation technology comprises an efficient multiple microorganisms which are screened from raw water of alkali residue waste water through a modern biological means, a microbial intensified culture device, an assorted culture medium, a purpose-made nutrient and running parameters. Therefore, by effective combination of the electrolytic air-flotation pretreatment system, the bioaugmentation technology, the disc-tube membrane and reverse osmosis membrane concentrating device and the spray drying device, pollutants and salts in the alkali residue waste water are thoroughly removed and separated, the treated waste water can be reused, and thorough treatment and zero emission of the high-concentration and high-salinity alkali residue waste water are finished.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a zero-discharge treatment method for alkali residue wastewater. Background technique [0002] Alkaline washing is often used to refine fuel oil in the refining process. Since the lye can react with compounds containing S, N, O, etc. in the oil, it can effectively remove substances that affect the stability of the oil and some sulfur compounds, such as naphthenic acid, phenols, hydrogen sulfide, mercaptans etc. Therefore, the alkaline washing and refining process has become an important link to improve the properties of oil products and improve the quality of oil products, and a large amount of alkali residue wastewater has also been generated. Alkali slag wastewater contains a large amount of pollutants, and its COD can reach tens of thousands of mg / L or even hundreds of thousands of mg / L. Moreover, alkali slag wastewater also contains high salinity, whi...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/44C02F1/441C02F1/465C02F3/34C02F9/00C02F11/127C02F2001/007C02F2301/046
Inventor 金寿日杨立国吴建华张峰张久鹏
Owner 辽宁海润环保技术股份有限公司
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