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Step-feed multistage A/O-MBR processing method for oil shale retorting waste water

A segmented water inlet and treatment method technology, applied in the field of sewage treatment, can solve the problems of high treatment cost, unstable treatment effect, low removal rate, etc., and achieve the goal of reducing the reflux ratio of mixed liquid, saving aeration cost, and reducing dosage Effect

Active Publication Date: 2015-12-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The treatment methods for oil shale retort wastewater at home and abroad mainly include physical and chemical methods, chemical methods, and biological methods; among them, physical and chemical methods and chemical methods are mainly used to remove petroleum and phenols in oil shale retort wastewater and improve the biodegradability of wastewater (pretreatment) and advanced treatment of wastewater; biological methods are mainly delayed aeration method, sequencing batch activated sludge method (SBR), membrane bioreactor method (MBR), anoxic / aerobic method (A / O), anaerobic / anoxic / aerobic method (A / A / O), contact oxidation method, etc., these processes have effectively improved the removal effect of organic matter and ammonia nitrogen in wastewater, but in the treatment of COD, ammonia nitrogen, total nitrogen content High oil shale mainstream wastewater often has disadvantages such as low removal rate, complicated operation and management, unstable treatment effect, and high treatment cost.
As the relevant national environmental protection standards have increased the control of total nitrogen indicators, it is difficult for existing technologies to meet the requirements of the new standards. For this reason, some oil shale refineries have begun to continuously add high-efficiency microorganisms; or adopt large reflux ratio and Extend the hydraulic retention time, strengthen aeration and other methods to improve the removal efficiency of COD, ammonia nitrogen and total nitrogen
However, these methods have greatly increased the operating costs of sewage treatment projects.

Method used

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  • Step-feed multistage A/O-MBR processing method for oil shale retorting waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The pretreated oil shale dry distillation wastewater is introduced into the staged influent multi-stage A / O-MBR treatment system; the staged influent multi-stage A / O-MBR treatment system consists of the first anoxic tank, the first aerobic tank, The second anoxic tank, the second aerobic tank, the third anoxic tank, the third aerobic tank and the membrane bioreactor are formed in series in sequence. Each anoxic tank is equipped with a stirring device or a submersible thruster, and each aerobic tank The tanks are equipped with aeration devices, and the membrane bioreactor is connected to the first anoxic tank through a return pipe; the oil shale dry distillation wastewater is divided into the first part, the second part and the third part, and enters the first anoxic tank, The second anoxic tank and the third anoxic tank; the first part accounts for 35% of the total volume of the total oil shale dry distillation wastewater, and the second part accounts for 35% of the total...

Embodiment 2

[0043] The method is the same as in Example 1, the difference is:

[0044] (1) The pretreated oil shale dry distillation wastewater has an ammonia nitrogen concentration of 2000mg / L, a total nitrogen content of 2100mg / L, and a COD concentration of 1900mg / L; the activated sludge concentration in each aerobic tank and anoxic tank is 2000mg / L; The first part accounts for 45% of the total volume of all oil shale dry distillation wastewater, and the second part accounts for 30% of the total volume of all oil shale dry distillation wastewater;

[0045] (2) The temperature during the nitration reaction is 10°C;

[0046] (3) Control the reflux ratio of the entire system to 300%;

[0047] (4) The ammonia nitrogen concentration of the discharged clean water is 4.8mg / L, the total nitrogen content is 170mg / L, and the COD is 240mg / L;

[0048] (5) V 1 Selected value 0.08, total hydraulic retention time of anoxic tank t 1 =24×(2100-200) / (3000×V 1 ), t 1 =190 hours; the hydraulic retention time of the...

Embodiment 3

[0051] The method is the same as in Example 1, the difference is:

[0052] (1) The pretreated oil shale dry distillation wastewater has an ammonia nitrogen concentration of 3000 mg / L, a total nitrogen content of 3100 mg / L, and a COD concentration of 4000 mg / L; the activated sludge concentration in each aerobic and anoxic tank is 5000 mg / L; The first part accounts for 45% of the total volume of oil shale dry distillation wastewater, and the second part accounts for 35% of the total volume of oil shale dry distillation wastewater;

[0053] (2) The temperature during the nitration reaction is 30°C;

[0054] (3) Control the reflux ratio of the entire system to 400%;

[0055] (4) The ammonia nitrogen concentration of the discharged clean water is 8.2mg / L, the total nitrogen content is 230mg / L, and the COD is 260mg / L;

[0056] (5) V 1 Selected value 0.2, total hydraulic retention time of anoxic tank t 1 =24×(3100-200) / (5000×V 1 ), t 1 =70 hours; the hydraulic retention time of the aerobic ta...

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Abstract

The invention provides a step-feed multistage A / O-MBR processing method for oil shale retorting waste water, and comprises the following steps: (1) the oil shale retorting waste water is introduced with a step-feed multistage A / O-MBR processing system; the waste water is divided into three portions and enters into three anoxic pools respectively; (2) denitrification reactions are carried out in each anoxic pool; (3) waste water enter into each aerobic pool, and nitrosation reactions and nitrification reactions are carried out in each aerobic pool; (4) the waste water enters into a membrane bioreactor; (5) clear water generated after filtering by the membrane module is discharged, and a retained sludge mixed liquor returns to the first anoxic pool. According to the invention, oxygen-limited aeration is carried out in the first aerobic pool and the second aerobic pool, thereby realizing short distance nitrification; by means of step-feed, COD in the original water can be fully utilized for denitrification, thereby reducing external carbon source adding amount and mixed liquor reflux ratio, and reducing aeration cost and denitrification required carbon source.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and particularly relates to a stepwise water-intake multi-stage A / O-MBR treatment method of oil shale dry distillation wastewater. Background technique [0002] Oil shale is an important alternative energy source that can be used to refine shale oil. China's shale oil production has risen from about 700,000 tons in 2012 to 800,000 tons in 2014, ranking the world in oil production. first place. During the shale oil production process, a large amount of oil shale dry distillation wastewater is produced. The wastewater contains a large amount of COD, ammonia nitrogen, volatile phenols, petroleum and other pollutants. It is an industry that contains high ammonia nitrogen, high organic pollutants, and is difficult to treat. Wastewater. [0003] The treatment methods for oil shale dry distillation wastewater at home and abroad mainly include physical and chemical methods, chemical methods, and biol...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 李亮胡筱敏于鑫钱光升姜彬慧
Owner NORTHEASTERN UNIV
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