MEMBRANE SEPARATION APPARATUS FOR DRINKING WATER PRODUCTION, AND ITS OPERATION METHOD

PROBLEM TO BE SOLVED: To provide a membrane separation apparatus for drinking water production which has a structure scarcely allowing a chemical to remain in piping although chemical washing and back washing are performed in a relatively short term using a chlorine type chemical with low concentration, and to provide an operation method of the membrane separation apparatus for drinking water production. SOLUTION: In the drinking water production equipment having the membrane separation apparatus comprised of a plurality of membrane modules, a water stop valve is dually installed at the pathway besides the drainage pathway among the pathways connected with the membrane module and a drain valve is installed when the chemical washing by the chemical is performed. According to the structure, the chemical remains in the piping and the chemical is difficult to incorporate into the membrane module permeate after the chemical washing and backwashing are performed. Further, a residual chlorine concentration meter to constantly measure the chlorine concentration in the permeate is installed at the permeate pathway of each membrane module. Thus, the safety of drinking water is assured by stopping the membrane module when the abnormal value of the residual chlorine concentration is measured by the residual chlorine concentration meter. COPYRIGHT: (C)2009,JPO&INPIT