Method for assessing the ability of methane substrate MBFR to reduce selenate and nitrate

Abstract

The invention relates to the technical field of bioremediation of oxidation-state pollutants, and aims at providing a method for assessing the selenate and nitrate reducing ability of a methane matrix MBfR. The method comprises the following steps: adding solutes to deionized water to prepare simulated wastewater, and introducing argon to carry out aeration; inoculating a methane matrix membrane bioreactor with a methane anaerobic oxidation coupled perchlorate-reducing community as an inoculation source; feeding the simulated wastewater in a continuous flow manner; keeping the concentration of SeO<4><2-> in the simulated wastewater stable, controlling the concentration of NO<3><-> in three stages, and allowing the reactor to enter a next stage after reaching a stable state. It is confirmed that microbes can drive the reduction of the SeO<4><2-> as a only electron donor for the first time. The methane matrix MBfR can remedy SeO<4><2-> polluted water, and also can realize the resource recycling of nanometer Se<0>.

Description

technical field [0001] The invention belongs to the technical field of bioremediation of oxidized state pollutants, in particular to a method for utilizing methane (CH 4 ) matrix membrane bioreactor (MBfR) to reduce selenate (SeO 4 2- ) and nitrate (NO 3 - ) Ability assessment method. Background technique [0002] Selenium salts widely exist in industrial (such as in the electronics industry, glass products, dyes, metallurgical additives, photoelectric cells, pesticides, etc.) wastewater, ore smelting drainage, farmland irrigation drainage, etc., and have strong physiological toxicity. Accumulation in plants, animals and the human body through the food chain can cause hair loss, nail breakage or loss, skin lesions, nervous disorders and other symptoms, and even have the "three causes" effect, causing serious harm to the environment and human body. [0003] In the prior art, selenate pollution in water is usually treated by physical removal methods including reverse osmo...

AI Technical Summary

Problems solved by technology

This technology consumes a lot of energy, and the price of operation and maintenance is high. At the same time, the concentrated wastewater formed will increase the difficulty of post-treatment

The chemical treatment method mainly involves the adsorption and precipitation of selenium, etc., the treatment cost is high, and it is easy to form high-concentration chemical sludge that is difficult to follow-up treatment

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