PFOA (perfluorooctanoic acid)-containing waste water treatment system

Abstract

The invention discloses a PFOA (perfluorooctanoic acid)-containing waste water treatment system. The system comprises an ultra-filtration unit and a nano-filtration unit which are sequentially arranged, wherein an input end of the nano-filtration unit is connected with a permeate outlet of the ultra-filtration unit, a concentrated solution outlet of the nano-filtration unit is connected with a collecting device of a PFOA concentrated solution, a membrane component of the ultra-filtration unit is a plate type membrane, membrane plates of the plate type membrane are arranged in a case at intervals, at least one pipe is arranged at the inner bottom surface of the case in the length direction of the case, the pipe opening at one end of each pipe is sealed, the pipe opening at the other end of each pipe is connected with an air source, and a plurality of air holes penetrating through the pipe wall are formed in the pipe wall, which is located in the case, of each pipe. The at least one pipe is arranged in the case of the membrane component of the ultra-filtration unit, so that the waste water treatment system can perform aeration treatment on the membrane component of the ultra-filtration unit during operation, suspended solids such as resin particles and the like can be prevented from enriching on surfaces of the membrane plates, the membrane component can be prevented from being polluted and blocked, and the PFOA in waste water can be recovered smoothly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a wastewater treatment system containing ammonium perfluorooctanoate. Background technique [0002] Perfluorinated compounds were first successfully developed by Minnesota Mining Manufacturing Co., Ltd. in the United States in 1947. They have excellent thermal stability, high surface activity and hydrophobic and oleophobic properties, and are widely used in polymer additives, lubricants, agricultural chemicals, surface Active agents, cleaning agents, cosmetics, textiles, blanket manufacturing, interior decoration, leather products, surface antifouling agents, pharmaceuticals, electroplating and many other industrial production and daily necessities, among which perfluorooctanoic acid ammonium (PFOA) is currently the most concerned perfluorinated compound. With the research summary of technicians, people gradually realize that ammonium perfluorooctanoate has the charact...

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Problems solved by technology

The Chinese patent literature discloses an invention patent (the publication number is CN101928078A) entitled "The method of treating wastewater containing low-concentration ammonium perfluorooctanoate by full-membrane method". The filtered permeate is then concentrated through the nanofiltration concentration unit group to obtain the ammonium perfluorooctanoate concentrate. The disadvantage of adopting this technical solution is that the wastewater containing ammonium perfluorooctanoate contains a large amount of suspended solids such as resin particles, which are very easy to pollute And block the membrane element, so how to improve the stable operation of the wastewater treatment process containing ammonium perfluorooctanoate, this is the key technology to be solved

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