Comprehensive treating method for high-salt-content wastewater

A comprehensive treatment, high salt content technology, applied in multi-stage water treatment, water/sewage treatment, special compound water treatment, etc., can solve problems such as application limitations, and achieve the effect of increasing service life, increasing service life and improving quality

Inactive Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only be realized by adding engineering bacteria from the United States, and its application is subject to certain restrictions.

Method used

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  • Comprehensive treating method for high-salt-content wastewater
  • Comprehensive treating method for high-salt-content wastewater
  • Comprehensive treating method for high-salt-content wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The method of the present invention is used to treat certain high-salt wastewater, and the wastewater quality is as follows: the COD concentration is 100-150 mg / L, the total nitrogen concentration is 40-60 mg / L, and the TDS is 5500 mg / L.

[0044] Sewage first enters the biological aerated filter, and the operating conditions are: temperature 27°C, pH 7.5, dissolved oxygen concentration about 1.0mg / L. In the biological aerated filter, the salt-tolerant bacteria agent 1# is added according to 0.5% of the treated wastewater volume per hour, and the growth promoter A is added according to the concentration of the promoter in the sewage treatment system at 0.5mg / L, and the pretreated The COD concentration in the effluent water is reduced to below 40mg / L, and the total nitrogen concentration is reduced to below 10mg / L. The effluent from the biological aerated filter enters the coagulation and sedimentation unit, adopts the lime-soda ash softening method, the residence time is...

Embodiment 2

[0046] Treat the same wastewater as in Example 1, the operating conditions of the BAF are the same as in Example 1, the difference is that the salt-tolerant bacteria agent 2 is added in the BAF according to 0.3% of the volume of wastewater treated per hour #, at the same time, add growth promoter B according to the accelerator concentration of 0.5mg / L in the sewage treatment system, the COD concentration in the pretreated effluent water will be reduced to below 40mg / L, and the total nitrogen concentration will be reduced to below 10mg / L. The effluent from the biological aerated filter enters the coagulation and sedimentation unit, adopts the lime-soda ash softening method, the residence time is 30min, and the pH is controlled at 9-10. After treatment, the effluent hardness + alkalinity ≤ 100mg / L, turbidity ≤ 5NTU, SS≤10mg / L, silicon dioxide≤50mg / L. The waste water after coagulation and sedimentation enters the reduction unit, the operating pressure is 5MPa, the concentration o...

Embodiment 3

[0048] The method of the invention is used to treat certain high-salt waste water. The water quality of the waste water is as follows: the COD concentration is 160-250 mg / L, the total nitrogen concentration is 50-100 mg / L, and the TDS is 9000 mg / L.

[0049]Sewage first enters the biological aerated filter, and the operating conditions are: temperature 35°C, pH 8.2, dissolved oxygen concentration 1.5mg / L. In the biological aerated filter, the salt-tolerant bacteria agent 3# is added according to 0.5% of the treated wastewater volume per hour, and the growth promoter C is added according to the concentration of the promoter in the sewage treatment system at 0.5 mg / L. After pretreatment The COD concentration in the effluent water is reduced to below 50mg / L, and the total nitrogen concentration is reduced to below 15mg / L. The effluent from the biological aerated filter enters the coagulation and sedimentation unit, adopts the lime-soda ash softening method, the residence time is 5...

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Abstract

The invention relates to a comprehensive treating method for high-salt-content wastewater. The comprehensive treating method comprises the following steps: (1) pre-treatment: adding a salt-tolerant bacterial agent and a growth promoter into an existing membrane bioreactor; (2) coagulation and sedimentation: carrying out coagulation and sedimentation by using a lime-soda ash softening process; (3)reduction treatment: subjecting the settled wastewater to reduction treatment in virtue of reverse osmosis; (4) biochemical treatment: adding the salt-tolerant microbial agent and the growth promoterused in the step (1); (5) concentration treatment; and (6) crystallization treatment. Compared with the prior art, the treating method of the invention achieves efficient removal of pollutants such asCOD and total nitrogen by using the salt-tolerant microbial agent and the growth promoter in the membrane bioreactor and a biochemical treatment system, and can effectively reduce membrane contamination, prolong the service life of membranes and ensure the stable operation of the system.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a comprehensive treatment method for high-salt wastewater. Background technique [0002] Whether it is coal chemical industry, petrochemical industry or oil and gas fields, the circulating water system, demineralized water system, boiler drainage system and reuse water treatment system will discharge a large amount of salty wastewater. These saline wastewater usually have a total saline mass fraction ≥ 1%, and generally belong to refractory wastewater. In addition to high concentrations of inorganic salts, this wastewater also contains refractory organic matter or toxic substances. If it is directly discharged into natural water bodies without treatment, it will inevitably have a great impact on aquatic organisms, drinking water, and industrial and agricultural production water. The hazards will cause huge pressure on the ecologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/048C02F1/38C02F1/441C02F1/445C02F1/5236C02F3/02C02F3/34C02F5/02C02F9/00C02F2301/08C02F2305/06
Inventor 郭志华高会杰孙丹凤赵胜楠陈明翔
Owner CHINA PETROLEUM & CHEM CORP
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