Method for biologically treating cadmium-containing wastewater

A biological treatment and wastewater technology, applied in the field of water treatment, can solve the problems of poor system stability, poor removal effect, long treatment time, etc., and achieve the effects of no secondary pollution, low treatment cost, and simple operation.

Active Publication Date: 2013-07-10
BEIJING UNIV OF TECH
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Problems solved by technology

However, these traditional physical and chemical methods for removing cadmium ions often have disadvantages such as high investment, long processing time, poor removal effect, and poor system stability.
[0005] So far, for the removal of cadmium ions in wastewater, in addition to the above-mentioned technologies, there is no technology and method without secondary environmental pollution

Method used

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  • Method for biologically treating cadmium-containing wastewater

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Embodiment 1

[0027] Raw water Cd 2+ The concentration is 12mg / L, COD / SO 4 2- =1.2, ORP=-108mv, pH is 7~8, temperature is 16~20℃, the carrier of the anaerobic biological filter is zeolite, the particle size is 1~1.25mm, the thickness of the filter layer is 1.2m, and the supporting layer is pebbles , the particle size is 5-15mm, and the thickness is 0.3m. The total amount of bacterial suspension of sulfate-reducing bacteria is 20L. After concentration, the bacterial suspension is 50ml, and the concentration of sulfate-reducing bacteria is 10 8 individual / mL. According to the volume ratio of 1:200, 50mL of the concentrated solution of sulfate-reducing bacteria and 10L of zeolite were made into a carrier filler with biological activity by bacterial embedding and immobilization technology, and added to the filter. The filtration rate of the filter is 0.4m / h, the hydraulic retention time is 3h, and the backwash intensity is 10L / m 2 s, the backwash lasts 3 minutes, and the backwash cycle is ...

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Abstract

The invention discloses a method for biologically treating cadmium-containing wastewater, and belongs to the field of water treatment. The method comprises the following steps: (1) producing a biological active carrier filler through concentrated sulfate reducing bacteria and an inorganic hydrophilic material utilizing a bacteria embedding immobilization technology, and directly filling the filler into an anaerobic biofilter; and (2) feeding the wastewater containing cadmium ions and sulphate ions into the biofilter, reducing hexavalent sulfur in the SO4<2-> into S<2-> through the sulfate reducing bacteria, combining cadmium with sulfion to form insoluble substances of cadmium sulphide, and thus removing cadmium. The raw wastewater passes through the biofilter, and cadmium in the produced water is less than 0.1mg/L, so that the national cadmium discharge requirements of Wastewater Quality Standards for Discharge to Municipal Sewers (CJ343-2010) are satisfied. The method has the advantages of high removal rate, stability in system operation, no secondary pollution and simplicity in operation. By utilizing the method, a heavy metal pollution problem can be effectively solved, and the method has an important practical meaning in cadmium-containing wastewater treatment and water environment improvement.

Description

technical field [0001] The invention relates to a method for biologically treating cadmium-containing wastewater, which is suitable for removing cadmium ions in the wastewater and belongs to the technical field of water treatment. Background technique [0002] At present, my country's heavy metal pollution mainly includes cadmium pollution, mercury pollution, blood lead pollution and arsenic pollution, among which cadmium pollution ranks first. [0003] Electroplating, printing and dyeing, textile, mining and other industries discharge a large amount of cadmium-containing wastewater, which will cause serious harm to our health after entering the environment. In recent years, there have been more than 30 major heavy metal pollution incidents in my country, which have seriously affected public health: cadmium pollution in Zhuzhou section of Xiangjiang River in Hunan in 2006, cadmium pollution in Liuyang City, Hunan Province in 2009, cadmium pollution in Longjiang, Guangxi in 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/34C02F101/22
Inventor 杨宏谭科艳吴宣顾运杜强强胡希佳尚海源陶慕翔赵月兰王玉洁姚仁达
Owner BEIJING UNIV OF TECH
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