Solidoid heterotrophy and electrochemical autotrophy integrated denitrification reactor for removing nitrate out of water

Abstract

The invention discloses a solidoid heterotrophy and electrochemical autotrophy integrated denitrification reactor for removing nitrate out of water. The denitrification reactor comprises a reactor body, a graphite anode, a foamed nickel cathode, a solidoid denitrification matrix packing layer, a plastic polyhedral hollow sphere packing layer, sample connections, a perforated baffle plate, a direct current supply, a water outlet and a water inlet. Solidoid denitrification matrixes, plastic polyhedral hollow spheres and the perforated baffle plate are arranged at the inner lower part of the reactor body from top to bottom; the water inlet is arranged at the bottom of the reactor body; a plurality of sample connections are arranged on the side wall of the reactor body; the water outlet is arranged at the top of the reactor body; the graphite anode is arranged in the middle of the reactor body; the foamed nickel cathode is arranged on the inner side wall of the reactor body; and the graphite anode and the foamed nickel cathode are respectively connected with the anode and the cathode of the direct current supply. The denitrification reactor can effectively remove nitrate pollutant out of water, the nitrate removal rate can be more than 80 percent, and the content of nitrite is below 0.01mg / l.

Description

technical field [0001] The invention relates to the treatment of groundwater and surface water in the field of environmental protection, in particular to a solid-phase heterotrophic and electrochemical autotrophic integrated denitrification reactor for removing nitrate in water. Background technique [0002] The treatment methods of nitrate in groundwater mainly include physical and chemical methods, chemical denitrification and biological denitrification. [0003] Physicochemical methods mainly include ion exchange, reverse osmosis and electrodialysis. [0004] Conventional ion exchange processes include anion exchange with chloride ion and bicarbonate ion resins. However, the ion exchange method consumes a large amount of regenerative chemicals, and it will cause secondary pollution when discharged. [0005] Reverse osmosis can not only remove NO from groundwater 3 - -N, also removes Cl at the same time - , SO 4 2- , Ca 2+ , Mg 2+ etc., are superior to other metho...

AI Technical Summary

Problems solved by technology

Heterotrophic denitrification requires organic carbon (such as methanol) as a nutrient source and electron donor for bacteria. The advantage of heterotrophic denitrification is that the denitrification speed is fast and the processing capacity per unit volume of the reactor is large. The disadvantage is that if the added substrate is insufficient , it is easy to cause NO in the effluent 3 - -N accumulation problem, if too much substrate is added, the residual organic substrate will cause secondary pollution to the treated water. Autotrophic denitrification mainly uses inorganic carbon in groundwater (such as CO 2 、HCO 3 - ) or additional sulfur or hydrogen as an energy source for denitrification. Since no additional organic matter is required, the effluent treated by this method will not contain organic carbon pollution, but its main disadvantage is that the processing capacity per unit volume of the reactor is small and the hydraulic retention time long

[0009] From the perspective of efficiency and cost, the biological denitrification method is the best method that has been put into practice at present, but it still has some shortcomings, such as high management requirements, not suitable for small-scale or decentralized water supply treatment, and requires follow-up Processing etc.

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