Purification treatment method for organotin-polluted seawater

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...

AI Technical Summary

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 revealing the transformation and fate pathways of organotin compounds and their derivatives in the atmospheric liquid phase, and there is no possibility of large-scale application in the detoxification and remediation of organotin-polluted seawater

[0004] In summary, the rapid treatment and restoration of organotin pollutants in seawater, especially in seawater of offshore farms, has become a difficult problem. There are still many shortcomings in the current method, and it is urgent to develop seawater that can completely mineralize organotin. Pollution control methods are of great significance for avoiding the expansion of heavily polluted areas from the port area to adjacent sea areas and even wider areas, causing the decline of marine resources and pollution endangering people's health

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