Nonlinear photocatalytic film for total nitrogen treatment in tail water of sewage treatment plant and application thereof

A non-linear optical and sewage treatment technology, applied in water/sewage treatment, degassed water/sewage treatment, multi-stage water/sewage treatment, etc., can solve the problem of difficult deep degradation of nitrate nitrogen, achieve high-efficiency purification capacity, The effect of reducing nitrogen emissions

Active Publication Date: 2018-07-17
江苏海壹环境科技有限公司
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Problems solved by technology

[0012] Aiming at the problem that nitrate nitrogen in the tail water of existing urban sewage treatment plants is difficult to be deeply degraded by microbial methods, the present invention provides a nonlinear photocatalytic membrane for the treatment of total nitrogen in the tail water of sewage treatment plants and its application. Membrane catalytic treatment is connected with the secondary treatment process of the sewage treatment plant, the operation is simple, the floor space is small, the sewage treatment efficiency is high, and the effluent water quality is stable

Method used

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  • Nonlinear photocatalytic film for total nitrogen treatment in tail water of sewage treatment plant and application thereof
  • Nonlinear photocatalytic film for total nitrogen treatment in tail water of sewage treatment plant and application thereof
  • Nonlinear photocatalytic film for total nitrogen treatment in tail water of sewage treatment plant and application thereof

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Effect test

Embodiment 1

[0036] Such as Figure 1-3 As shown, the nonlinear photocatalytic membrane used for the treatment of total nitrogen in the tail water of a sewage treatment plant is composed of a support layer and a coating layer, the support layer is a polyethersulfone membrane, and the preparation method of the nonlinear photocatalytic membrane is as follows: : Dissolve 18g of PES particles and 4g of polyvinylpyrrolidone (PVP K-30) powder in 78ml of N-methylpyrrolidone (NMP), shake in a water bath at 50°C for 6 hours, and pour the casting solution into a smooth For a glass plate, use a scraper to scrape out a liquid film about 200 μm thick, let it stand for 1 minute, and then get a PES support layer in a hydrocoagulation bath; soak the PES film in 3 wt% acrylic acid solution for 30 minutes, take out the PES film and drop it on the surface 1ml 5wt% K 2 S 2 o 8 , and then put the PES film under a 254nm curing lamp to irradiate for 15min and wash it with pure water to obtain a grafted modifi...

Embodiment 2

[0042] The nonlinear photocatalytic film prepared in Example 1 was cut into an original sheet with a diameter of 8 cm, and placed in a photocatalytic device made of quartz. A rubber gasket is used to seal the diaphragm and the permeable layer.

[0043] Take 500ml of tail water after the activated sludge A / O process of Nanjing Jiangxinzhou Sewage Treatment Plant and inject it into the quartz device, and the water quality condition is COD Cr 47.6mgL -1 , nitrate nitrogen (calculated as N) is 12.48mgL -1 , the pH is 6.8, and 20ml of 85 formic acid is added at the same time. Turn on the 125W xenon lamp light source (λ=365nm) for irradiation, the distance between the light source and the membrane surface is 20cm, and nitrogen gas is passed through, and the water sample is driven through the membrane with a transmembrane pressure difference of 0.2MPa, and the water flux is 270±18Lm -2 h -1 . After the water sample is filtered, take the water sample in the water storage tank and...

Embodiment 3

[0045] The obtained nonlinear photocatalytic film was cut into an original sheet with a diameter of 8 cm, and placed in a photocatalytic device made of quartz. A rubber gasket is used to seal the diaphragm and the permeable layer.

[0046] Take 1000ml of tail water after the activated sludge A / O process of Nanjing Jiangxinzhou Sewage Treatment Plant and inject it into the quartz device, and the water quality condition is COD Cr 47.6mgL -1 , nitrate nitrogen (calculated as N) is 12.48mgL -1 , pH is 6.8, add 85 formic acid 10, 20, 40, 60, 80ml respectively. Turn on the 125W xenon lamp light source (λ=365nm) for irradiation, the distance between the light source and the membrane surface is 20cm, and nitrogen gas is passed through, and the water sample is driven through the membrane with a transmembrane pressure difference of 0.2MPa, and the water flux is 270±18Lm -2 h -1 . After the water sample is filtered, take the water sample in the water storage tank and measure the COD...

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Abstract

The invention discloses a nonlinear photocatalytic film for total nitrogen treatment in tail water of a sewage treatment plant and application thereof. According to the photocatalytic film, removal oftotal nitrogen in tail water of a town sewage plant serves as a main aim, the surface of a polyether sulfone film is coated by utilizing a nonlinear optical material LiNbO3 powder, and under 365nm ultraviolet irradiation and oxygen-free conditions, a small amount of formic acid is added, so that an obvious effect of realizing advanced nitrogen removal of the tail water can be achieved. The removal rate of low-concentration nitrate nitrogen can reach 80%, and the photocatalytic selectivity of the nitrogen reaches 98%. The nonlinear photocatalytic film disclosed by the invention has the separation characteristic of an ultrafiltration membrane and photocatalytic reduction performance of nitrate nitrogen, the nitrate nitrogen in the tail water and microbes and suspended materials in intercepting water can be simultaneously removed, and the influence of the tail water in the sewage plant on drinking water quality is obviously reduced; the transmembrane pressure difference and energy consumption are low, and advanced nitrogen removal of the tail water the sewage plant can be completed in short hydraulic retention time.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/36C02F9/08C02F101/30
CPCB01J31/06B01J31/36B01J35/004B01J37/0221C02F1/20C02F1/325C02F1/444C02F9/00C02F2101/30C02F2301/08C02F2305/10
Inventor 许航李洋陈卫丁明梅沈桢王康林晨烁王月婷
Owner 江苏海壹环境科技有限公司
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