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Method for preparing biological fluidized bed carrier and treating waste water

A biological fluidized bed, wastewater treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption, high cost and difficult post-treatment Recycling and other issues, to achieve the effect of good turbulent flow, easy sedimentation and good treatment effect

Active Publication Date: 2013-02-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inorganic particle carrier with good effect and common use is activated carbon, but because of its high energy consumption in pre-treatment, difficult recycling and high cost in post-treatment (Luo Xuemei, Ding Sanglan. Research on Fluidized Bed Bioreactor Carrier[ J]. Water Treatment Technology, 2010, 36(7): 20-23.) Shortcomings limit its wide application, and there is little research on using waste coke powder as a carrier in a biological fluidized bed, which will contribute to the rational use of waste coke provide a better idea

Method used

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  • Method for preparing biological fluidized bed carrier and treating waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025](1) Biological fluidized bed carrier: use a 8-30 mesh sieve to screen the coke powder from Shaanxi Shenmu Sanjiang Coal Chemical Co., Ltd. to screen out coke powder particles with a size of 0.6-2.5mm, about 10kg, and the screened particles Pour it into water, and screen the particles with a specific gravity higher than water (the specific gravity range is between 1.06-2.09) from it. After washing the impurities in the coke powder with water, dry it at 150°C to a constant weight, and put the dried carrier into the mass concentration of Immerse in 15% KOH aqueous solution for 6 hours, then wash several times with 5% HCl aqueous solution and dry at 150°C to obtain the biological fluidized bed carrier. The true density of the carrier is 1.6g / cm 3 , the pore size range is between 0-15nm, and the average pore size of BJH adsorption is 6.8653nm, ready for use, about 8kg.

[0026] (2) The method of using biological fluidized bed carrier to treat wastewater:

[0027] Described w...

Embodiment 2

[0031] The preparation of the biological fluidized bed carrier, the biological fluidized bed system, the culture medium, and the wastewater treatment method are the same as in Example 1.

[0032] Inoculate the activated sludge at the bottom of the main body of the biological fluidized bed. The inoculum volume of the activated sludge is 3 L. Add 10 kg of the biological fluidized bed carrier (the dosage is 45%). Turn on the air blower for 24 hours and then turn off the air blower. Set aside for 12 hours, discharge suspended sludge and sewage, continuously add culture medium at a rate of 2.5-5L / h from the waste water inlet, and discharge water from the waste water outlet. Add 2,4,6-trichlorophenol simulated wastewater with a COD concentration of 300mg / L and an ammonia nitrogen concentration of 5mg / L in the medium, aerated culture (3 weeks) until the thickness of the biofilm on the carrier is 45-70μm, stop adding For the culture medium, the above wastewater is used to replace the ...

Embodiment 3

[0034] The preparation of the biological fluidized bed carrier, the biological fluidized bed system, the culture medium, and the wastewater treatment method are the same as in Example 1.

[0035] Inoculate the activated sludge at the bottom of the main body of the biological fluidized bed. The inoculum volume of activated sludge is 3 L. Add 10 kg of biological fluidized bed carrier (dosing amount is 45%) about 9 kg. Turn on the blower and then close it after 24 hours of stuffy exposure Let the blower stand still for 12 hours, discharge the suspended sludge and sewage, continuously add the culture medium from the waste water inlet at a rate of 2.5-5L / h, and discharge the water from the waste water outlet. Add municipal sewage with a COD concentration of 836mg / L and an ammonia nitrogen concentration of 163mg / L to the culture medium, aerated culture (15 days) until the thickness of the biofilm on the carrier is 20-45μm, stop adding the culture medium, and replace it with the above...

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Abstract

The present invention discloses a method for preparing a novel biological fluidized bed carrier by using waste coke powder and treating waste water. According to the method, active sludge is inoculated in a biological fluidized bed main body, a biological fluidized bed carrier is poured, membrane forming culture is performed, waste water enters a reflux groove through a water pump, concurrently partial effluent of the reflux groove refluxes to the reflux groove, an influent pump is adopted to pump the waste water in the reflux groove into the biological fluidized bed, and water quality of effluent on an upper effluent port of a precipitation tank is monitored, wherein standard discharge is performed if a concentration of effluent COD is less than 100 mg / L and an ammonia nitrogen concentration is less than 10 mg / L, if the standard is not met, the effluent enters the reflux groove through a three-way valve to be continuously treated. According to the carrier, a good turbulent flow effect is provided in the fluidized bed, efficiency is high, a sufficient specific surface area can be provided, membrane forming is easily achieved, no toxic and harm effect is generated, and the carrier is easily fluidized in water and does not easily run off. In addition, the carrier adopts waste coke powder as the raw material, such that material taking is easy, the material source is wide, price is low, and the waste coke powder is subjected to resource utilization so as to change waste into valuables.

Description

(1) Technical field [0001] The invention relates to a method for preparing a novel biological fluidized bed carrier and treating waste water by utilizing waste coke powder. (2) Background technology [0002] Coke powder, that is, coke powder, the powder range is generally 0-10mm, and it is a by-product produced during the production, screening, transportation and use of semi-coke. According to statistics in 2009, my country is the world's largest producer and consumer of semi-coke, with an annual output of nearly 200 million tons. However, the utilization rate of semi-coke is only about 70% in practice. Therefore, the amount of coke powder produced in my country is huge every year, about 40-60 million tons per year. Except a few of these coke powders are used as honeycomb coal and coal blending in metallurgical industry, most of them are left idle as solid waste, which not only pollutes the environment, but also takes up a lot of space and wastes precious resources. At pre...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 潘志彦方辉胡方明
Owner ZHEJIANG UNIV OF TECH
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