Purification treatment method for organotin-polluted seawater

A purification treatment and organic tin technology, applied in the field of water treatment, can solve the problems of marine resource decline, endangering people's health, and no detoxification and repair, and achieve the effects of increased degradation rate, thorough mineralization, and wide application range

Active Publication Date: 2013-07-10
SHANGHAI GREENSUN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor penetrating ability of ultraviolet rays, photodegradation only occurs in the upper few centimeters of the water body, so it is impossible to become the main process of tributyltin degradation and cannot be applied in actual production
In addition, Yang Yu et al [Yang Yu, Environmental Pollution and Prevention, 2009,31(1):62-64] carried out a study on the degradation mechanism of organotin compounds by laser flash method, which proved that the powerful energy emitted by laser flash It can attack the benzene ring connected to TPhT, causing its ring opening or Sn-C bond breakage, so as to achieve the purpose of completely mineralizing and degrading TPhT, but because this method needs to use a high-power Nd:YAG laser, and it is only a Experimental methods for understanding or

Method used

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  • Purification treatment method for organotin-polluted seawater
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Examples

Experimental program
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Example Embodiment

[0044] Example 1

[0045] It was taken from the surface seawater of Wusong Port in Shanghai. The pH of the seawater was 7.45 and the salinity was 23.1psu. At the same time, the content of tributyltin was 16.8μg / L through analysis by high performance liquid chromatography. First, it was passed through a filter with a pore size of 100μm. After filtering, pump into the electro-assisted ultraviolet photocatalytic reduction reaction system. In the reaction system, the ultraviolet light source adopts a low-pressure mercury lamp capable of emitting a dominant wavelength of 254 nm, and the reduction photocatalyst material is TiO with industrial pure titanium mesh as the supporting substrate. 2 -NiO-CuO composite metal oxide (the composition ratio of each metal oxide is molar ratio: TiO 2 : NiO: CuO=5:55:40), using lithium ion batteries as the power source of the applied electric field, the voltage of the applied electric field is maintained -0.14V~ -0.20V; the polluted seawater is fully co...

Example Embodiment

[0046] Example 2

[0047] The surface seawater taken from Ningbo Xiangshan Port has a pH of 7.32 and a salinity of 21.6psu. At the same time, the content of tributyltin is 11.5μg / L through analysis by high performance liquid chromatography. First, the pore size is 100μm. After the filter is filtered, it is pumped into the electro-assisted ultraviolet photocatalytic reduction reaction system. In the reaction system, the ultraviolet light source adopts a low-pressure mercury lamp capable of emitting a dominant wavelength of 185nm, and the reduction photocatalyst material is an industrial pure titanium mesh as a supporting substrate TiO 2 -NiO-CuO composite metal oxide (the composition ratio of each metal oxide is molar ratio: TiO 2 : NiO: CuO=10:30:60), using lithium ion batteries as the power source of the applied electric field, the voltage of the applied electric field is maintained -0.25V~ -0.27V; the polluted seawater is fully contacted with the reducing photocatalyst material ...

Example Embodiment

[0048] Example 3

[0049] The surface seawater taken from the port of Shanghai Yangshan Port has a pH of 7.55 and a salinity of 24.1psu. At the same time, the content of tributyltin is 12.9μg / L through analysis by high performance liquid chromatography, and the pore size is 100μm. After filtering by the filter, pump into the electro-assisted ultraviolet photocatalytic reduction reaction system. In the reaction system, the ultraviolet light source adopts a low-pressure mercury lamp capable of emitting 185nm mixed with 254nm wavelength, and the reduction photocatalyst material is an industrial pure titanium mesh as the supporting substrate TiO 2 -NiO-CuO composite metal oxide (the composition ratio of each metal oxide is molar ratio: TiO 2 : NiO: CuO=1:55:44, using lithium ion battery as the power source of the applied electric field, the voltage of the applied electric field is maintained -0.32V~ -0.34V; the polluted seawater is fully contacted with the reducing photocatalyst mater...

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Abstract

The invention discloses a purification treatment method for organotin-polluted seawater. The purification treatment method comprises the following steps of: step 1, filtering: filtering the organotin-polluted seawater by using a filter of 50-100 mu m; step 2, pumping the filtered seawater into an electric ultraviolet catalytic reduction system, wherein the system comprises a photocatalyst and an ultraviolet source, in the system, the seawater is in full contact with a photocatalyst material and is irradiated by ultraviolet light to carry out an ultraviolet photodegradation reaction and a photocatalytic reduction mineralization reaction, a mixture is kept for 60-240 seconds and is then exhausted safely, and the photocatalyst is a metal-oxide photocatalyst with a photocatalytic reduction function. The method provided by the invention has the advantage of safety, reliability, high efficiency, low energy consumption, thorough mineralization of organotin pollutants, no addition of chemical agent, no secondary pollution, no change of physicochemical property of seawater and environment friendliness, and can meet the demands of purifying and quickly restoring the organotin-polluted seawater, especially the seawater polluted by organotin in offshore cultivation farms.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for purifying polluted water, in particular to a method for purifying seawater polluted by organotin. Background technique [0002] Since the middle of the 20th century, organotin compounds (OTC) have been used as anti-biofouling coatings for marine vessels and offshore platforms. Longer lifespan of buildings and ships, reduced fuel consumption and lower maintenance costs. Wood preservatives, insecticides, fungicides, etc. have been widely used on a large scale. However, research reports in recent years have shown that organotins have a great toxic effect on marine fish, crustaceans, molluscs and marine algae. Marine organisms have a strong enrichment ability for organotin, which is between 5000-10000 times. Therefore, at a very low concentration, it can cause the above-mentioned marine bioaccumulative poisoning or cause terrible reproductive reverse changes. Or...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/70C02F1/48C02F101/30C02F103/08
Inventor 张丽董丽华李庆宏孙祥
Owner SHANGHAI GREENSUN ENVIRONMENTAL PROTECTION TECH CO LTD
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