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Method for treating solid wastes by culturing biological leachate by use of membrane bioreactor

A membrane bioreactor and solid waste technology, which is applied in the direction of solid waste removal and process efficiency improvement, can solve the problems of rapid leaching of hazardous solid waste, slow growth, and anti-deficit, etc., and achieves a solution to biological oxidation. Inefficiency, increased microbial concentration, and shortened leaching cycle effects

Active Publication Date: 2015-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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AI Technical Summary

Problems solved by technology

[0006] Although bioleaching technology is economical, green, safe, energy-saving, and low-consumption, it also has the problems of anti-deficiency, low rate, and long cycle. Usually, the reaction time is as long as several weeks or even months.
This is because most of the leaching strains are chemoautotrophs with slow growth, which lead to the production of H by biocatalysis. + ,Fe 2+ ,Fe 3+ and other active substances cannot meet the needs of rapid leaching of hazardous solid waste
Moreover, because many solid wastes contain toxic substances, the catalytic activity of leaching strains under high solid-liquid ratio conditions is lost or even dead

Method used

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  • Method for treating solid wastes by culturing biological leachate by use of membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put Thiobacillus thiooxidans and Thiobacillus ferrooxidans into a 100L membrane bioreactor at a ratio of 1:1, and the membrane module is a polytetrafluoroethylene flat microfiltration membrane. Inorganic salt culture solution includes: (NH 4 ) 2 SO 4 ,1.0g / L; MgSO 4 ,0.5g / L; CaCl 2 ,0.1g / L; KH 2 PO 4 , 1.0g / L; sulfur, 16g / L. Tap water configuration, natural pH.

[0028]The external circulating water controls the temperature inside the reactor to be 30°C, the aeration rate is 20L / min, and the stirring speed is 100r / min. After running for 5 days, the pH of the culture solution dropped from 7.0 to 1.0, and the bacterial concentration was 1.2×10 9 pieces / ml. The inflow and outflow of the membrane bioreactor was started to maintain balance, and the flux was 2L / h. As the concentration of microorganisms in the reactor increased, the pH of the effluent gradually decreased and stabilized at 0.90. The membrane bioreactor produces approximately 50 liters of bioleachate ...

Embodiment 2

[0030] Thiobacillus thiooxidans, Thiobacillus ferrooxidans and Leptospira ferrooxidans were introduced into a 200L membrane bioreactor at a ratio of 1:1:1, and the membrane module was a polytetrafluoroethylene flat microfiltration membrane. Inorganic salt culture medium includes: KNO 3 ,1.0g / L; MgCl 2 ,0.5g / L; CaCl 2 ,0.1g / L; KH 2 PO 4 , 1.0g / L; Sulfur, 24g / L. Tap water configuration, natural pH.

[0031] The temperature inside the reactor is controlled by external circulating water to be 30°C, the aeration rate is 50L / min, and the stirring speed is 80r / min. After running for 5 days, the pH of the culture solution dropped from 7.0 to 1.0, and the bacterial concentration was 1.0×10 9 pieces / ml. The inflow and outflow of the membrane bioreactor was started to maintain balance, and the flux was 6L / h. As the concentration of microorganisms in the reactor increased, the pH of the effluent gradually decreased and stabilized at 1.0. The membrane bioreactor produces approxima...

Embodiment 3

[0033] Put Thiobacillus thiooxidans and Leptospira ferrophilum at a ratio of 1:1 into a 100L membrane bioreactor, and the membrane module is a hollow fiber membrane. Inorganic salt culture medium includes: KNO 3 ,1.0g / L; MgSO 4 ,0.5g / L; CaCl 2 ,0.1g / L; K 2 HPO 4 , 1.0g / L; sulfur, 12g / L; pyrite, 12g / L. Tap water configuration, natural pH.

[0034] The temperature inside the reactor is controlled by external circulating water to be 35°C, the aeration rate is 40L / min, and the stirring speed is 120r / min. After running for 5 days, the pH of the culture solution dropped from 7.0 to 1.0, and the bacterial concentration was 1.2×10 9 pieces / ml. The inflow and outflow of the membrane bioreactor was started to maintain balance, and the flux was 3L / h. As the concentration of microorganisms in the reactor increased, the pH of the effluent gradually decreased and stabilized at 0.90. The membrane bioreactor produces approximately 75 liters of bioleachate at a pH of 0.9 per day. Zin...

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Abstract

The invention relates to a method for treating solid wastes by culturing biological leachate by use of a membrane bioreactor, and belongs to the field of a solid waste resource treatment technology. The membrane bioreactor is applied to biological leachate culture and regeneration firstly and is used for the innocent and resource treatment of dangerous solid wastes. A group of membrane components is arranged in the bioreactor, and the metabolism and the growth of leaching bacterial strains are controlled through the adjustment of the aeration rate, the stirring speed, the concentration of nutrient substances and the like, when the concentration of the leaching bacterial strains is in a stable phase, water inlet and water outlet functions are started to enable the membrane bioreactor to be in a chemostat state, the leaching bacterial strains can be enriched by the interception action of the membrane, and the yield of the biological leachate is increased. The method can be used for effectively solving the problems that the leaching bacterial strains grow slowly, the biomass is low, the leaching efficiency is low, the leaching period is long and the like, has the beneficial effects of simpleness, high safety, energy conservation and wide application range, can be operated conveniently and is suitable for the innocent and resource treatment of different solid wastes.

Description

technical field [0001] The invention relates to a method for treating solid waste by using a membrane bioreactor to cultivate biological leachate, and belongs to the technical field of solid waste resource treatment. Background technique [0002] Membrane bioreactor (MBR for short) is a new water treatment technology that combines membrane separation technology with activated sludge process. The separation characteristics of the membrane are used to replace the secondary settling tank of the activated sludge process, and the solid-liquid separation is carried out, so as to achieve the purpose of mud-water separation. Moreover, using the high-efficiency interception effect of the membrane can effectively intercept different types of microorganisms. For example, the nitrifying bacteria can be completely retained in the bioreactor, so that the nitrification reaction can be carried out quickly; time to obtain maximum decomposition removal. Although membrane bioreactors have be...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C22B7/00C22B3/18
CPCY02P10/20
Inventor 辛宝平王佳辛亚云牛志睿张永涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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