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Device and method for synchronously removing selenium and cadmium in wastewater and generating nanometer cadmium selenide by using microorganisms

A microbial and nano-selenium technology, applied in chemical instruments and methods, metal selenide/telluride, water pollutants, etc., can solve problems that do not meet green and sustainable development, and achieve low-cost effects

Active Publication Date: 2018-06-29
NANHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Traditional chemical synthesis methods often involve high temperature, anaerobic, toxic reagents, and surface modification reaction processes, which do not meet the needs of green and sustainable development

Method used

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  • Device and method for synchronously removing selenium and cadmium in wastewater and generating nanometer cadmium selenide by using microorganisms
  • Device and method for synchronously removing selenium and cadmium in wastewater and generating nanometer cadmium selenide by using microorganisms
  • Device and method for synchronously removing selenium and cadmium in wastewater and generating nanometer cadmium selenide by using microorganisms

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Embodiment 1

[0072] 1.1 Device configuration:

[0073] Using the device provided by the invention for synchronously removing selenium and cadmium in wastewater and generating nano-cadmium selenide, the reaction chamber 1 has a height of 80 cm, a diameter of 6 cm, and an effective volume of 2 L, and is inoculated with 10%-20% of anaerobic granular sludge.

[0074] The anaerobic granular sludge used contains the following microorganisms: Desulfovibrio, Pseudomonas, Firmicutes, Methanobacteria, Methanobacteria. The carbon source is lactic acid (using sodium lactate to prepare a lactic acid concentration of 5-10mM), the nutrient solution NH 4 Cl(200mg / L)CaCl 2 2H 2 O (10mg / L), KH 2 PO 4 (200mg / L), Na 2 HPO 4 (200mg / L), MgCl 2 (100mg / L), KCl (200mg / L), and add trace elements.

[0075] 1.2 Operating conditions:

[0076] Hydraulic retention time 12h;

[0077] Influent flow = V / HRT = 2 / 12 = 2.78mL / min;

[0078] The internal circulation flow rate is 3-5 times of the water flow rate;

[...

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Abstract

The application discloses a device for synchronously removing selenium and cadmium in wastewater and generating nanometer cadmium selenide by using microorganisms. The device comprises a reaction chamber (1) provided with a water inlet (11) and a water outlet (12) and a gas collecting component (2), wherein anaerobic granular sludge containing the microorganism is stored in the reaction chamber (1); the gas collecting component (2) is arranged at the top of the reaction chamber (1) and is communicated with the reaction chamber (1); anaerobic microorganisms are any two or more of sulfate-reducing bacteria, dissimilatory metal reduction bacteria, selenium reducing bacteria and archaea. The application also provides a method for synchronously removing the selenium and the cadmium in the wastewater and generating the nanometer cadmium selenide by using the device. According to the device and the method provided by the application, synchronous removal of the selenium and the cadmium in thewastewater is realized and the nanometer cadmium selenide can be generated.

Description

technical field [0001] The application relates to the technical field of sewage treatment, in particular to a device and method for synchronously removing selenium and cadmium in waste water and generating nano-cadmium selenide by using microorganisms. Background technique [0002] Selenium is an essential trace element for human and animal physiology, and plays an extremely important role in human health, but a slight increase in selenium concentration will produce toxic effects and pollute the environment. With the development of industry, the man-made selenium also increases accordingly. The selenium-containing wastewater comes from mining, metal and petroleum smelting, coal-fired thermal power plants and local agricultural irrigation, etc. There will also be various heavy metals in it, such as zinc, cadmium and lead. Wait. [0003] Selenium is a chalcogen element, which mainly exists in four valence states of +6, +4, 0 and -2 in nature. Soluble selenium in water mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C01B19/04C02F101/10
CPCC01B19/007C02F3/28C02F2101/10C02F2101/106
Inventor 曾涛涛王国华刘海燕李仕友荣丽杉周玉林
Owner NANHUA UNIV
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