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Device and method for biologically treating cadmium in wastewater

A biological treatment and heavy metal technology, applied in the field of water treatment, to achieve the effect of low treatment cost and simple process

Active Publication Date: 2014-06-25
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the existing traditional cadmium removal process and provide a device and method for biologically treating heavy metal cadmium in wastewater

Method used

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  • Device and method for biologically treating cadmium in wastewater

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Embodiment 1

[0036] 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 sulfate reduction biological filter is zeolite, the particle size is 0.8~1.25mm, 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, and the backwash intensity is 10L / m 2 s, the backwash lasts 3 minutes, and the backwash cycle is 20 days. The carrier of th...

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Abstract

The invention discloses a device and a method for biologically treating cadmium in wastewater, and belongs to the technical field of water treatment. The method comprises the following steps: (1) constructing and starting a sulfate reducing biofilter; (2) constructing and starting an iron and manganese removing biofilter; (3) feeding cadmium-containing wastewater into the sulfate reducing biofilter, reducing hexavalent sulfur in the SO4<2-> into S<2-> through sulfate reducing bacteria, combining cadmium with sulfion to form insoluble substances of cadmium sulphide, and blocking most cadmium; feeding the unblocked cadmium into the iron and manganese removing biofilter, and adsorbung and removing cadmium by utilizing the adsorptivity of ecological manganese dioxide and ferrous oxides which are newly generated in the filter; and (4) feeding the raw wastewater into two levels of biofilters to be filtered sequentially. Cadmium in the produced water is less than 0.005mg / L, so that the national cadmium discharge requirements of second and third-class water in Environmental Quality Standards for Surface Water (GB3838-2002) are satisfied.

Description

technical field [0001] The invention relates to a method for biologically treating heavy metal cadmium in waste water, which is suitable for removing heavy metal cadmium in waste water and belongs to the technical field of water treatment. Background technique [0002] Cadmium is a highly toxic pollutant. It is widely used in electroplating, pigments, storage batteries, plastics, metallurgy and other industries. Due to the continuous development and utilization of cadmium by humans, a large amount of cadmium-containing wastewater is now discharged into rivers and lakes. In recent years, there have been many cadmium pollution incidents in my country, which have seriously affected public health: cadmium pollution in Zhuzhou section of Xiangjiang River in Hunan Province in 2006, cadmium pollution in Liuyang City, Hunan Province in 2009, cadmium pollution in Longjiang, Guangxi in 2012, among which Longjiang, Guangxi The cadmium pollution incident in the 2018 river reached about 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/22
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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