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Opimization of reverse osmosis membrane scale inhibitor and its performance evaluation

Authors： LI Lihua1, CUI Yong,Jiang Yuming,Zhou Yi,Liu Zifa, Wei Shaosong, Wang Hui, PEI Chaoying, Hao Xue

Units： 1. Beijing Yizhuang Water Supply Co., LTD. ,Beijing 100176, China; 2.Beijing Hanqi Environment and Technic Limited Company, Beijing 100085, China;. 3. Beijing Nengtai High-tech Environmental Protection Technology Co., LTD., Beijing 101601, China; 4. Beijing Guohuan Tsinghua Enviromental Engineering Design& Resign & Research Institute Co.,Ltd. Beijing 100084, China; 5. Dow Chemical (China) Investment Co., LTD. Beijing Branch, Beijing 100006

KeyWords： Scale inhibitor; RO; Scale; Industrial test evaluation

ClassificationCode：X703

year,volume(issue):pagination： 2021,41(3):135-141

Abstract：

This paper investigates the applicability and optimum dosage of AntarcticATM ROSD 9000 scale inhibitor in reverse osmosis system of a reclaimed water plant in Yizhuang. Reverse osmosis production system was simulated. Under the calculation of 75% recovery rate and actual inlet water quality, only the Langelier saturation index of reverse osmosis concentrated water exceeded the scale tendency control index, and the CaCO3 scale tendency was obvious, so it was necessary to add appropriate scale inhibitor. Simulate the system security under different variable conditions to guide the actual production. The limit carbonate hardness test was carried out with pilot-scale device, and it was concluded that the dosage of 2.5ppm-3.0ppm was more suitable, that is, the system operating pressure had no obvious change, and RO concentrated water side had no scaling tendency. The dosage of 2.0ppm is not conducive to the stable operation of the system. The actual production system verified that the system operated safely when the dosage was 2.5-3.0ppm, the frequency of reverse osmosis cleaning was reduced, Scale inhibitor accounts for 60% of the cost of production agents used in system operation, and effective cost control is achieved in the test.

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AuthorIntro：

李利华(1987-)，女，山东省冠县，硕士，中级工程师，主要从事再生水运营及水处理技术研究

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