Nonlinear Photocatalytic Membrane for Total Nitrogen Treatment in Tailwater of Wastewater Treatment Plant and Its Application

Abstract

The invention discloses a nonlinear photocatalytic membrane used for total nitrogen treatment in tail water of a sewage treatment plant and its application. The main purpose of the photocatalytic film is to remove total nitrogen from the tail water of urban sewage plants, using the nonlinear optical material LiNbO 3 The powder coats the surface of the polyethersulfone membrane. Under 365nm ultraviolet light irradiation and anaerobic conditions, plus a small amount of formic acid, it can play a significant role in the deep denitrification of tail water. Among them, the removal rate of low-concentration nitrate nitrogen can be up to 80%, and its photocatalytic selectivity to nitrogen is as high as 98%; the nonlinear photocatalytic membrane of the present invention has the separation characteristics of an ultrafiltration membrane and the photocatalytic reduction performance of nitrate nitrogen, and can simultaneously remove tail water nitrate It can significantly reduce the impact of sewage plant tail water on drinking water quality by removing nitrogen and intercepting microorganisms and suspended matter in the water; the transmembrane pressure difference and low energy consumption can complete the treatment of sewage plant tail water in a short hydraulic retention time. Deep denitrification.

Description

technical field

[0001] The invention belongs to the field of environmental protection sewage treatment, and in particular relates to a nonlinear photocatalytic film for treating total nitrogen in tail water of a sewage treatment plant and an application thereof. Background technique

[0002] In November 2015, the Ministry of Environmental Protection issued the "Letter on Soliciting Opinions on the National Environmental Protection Standard "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (Draft for Comment)", and added "special discharge standards" for "areas with prominent water eutrophication problems". Limit", in which except TN and SS are 10mg / L and 5mg / L respectively, COD, BOD 5 , NH 3 -N, TP discharge limits are respectively "Surface Water Environmental Quality Standard" (GB3838-2002) water quality standards. In the future, with the gradual implementation of my country's "Water Ten Measures", the discharge of organic carbon and total nitrogen in th...

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