초록 ▼

A system of purifying water to remove at least one of natural organic matter, color, turbidity, bacteria, cysts and oocysts, viruses, arsenic compounds and insoluble impurities. The system comprises the steps of providing a body of water to be purified; controlling the pH of the body in a range of 5

A system of purifying water to remove at least one of natural organic matter, color, turbidity, bacteria, cysts and oocysts, viruses, arsenic compounds and insoluble impurities. The system comprises the steps of providing a body of water to be purified; controlling the pH of the body in a range of 5 to 8; and adding a coagulant to the body to provide a floc. The floc is maintained in the body in a concentration in the range of 1 to 6, for purposes of adsorbing at least one of the natural organic matter, color, turbidity and bacteria to provide treated water. Thereafter, a first portion of the treated water and floc is removed from the body of water. A submerged semi-permeable membrane is provided in the body of water for removing a second portion of the treated water. The membrane has a pore size in the range of 0.02 to 1 .mu.m to provide a permeate comprised of purified water and to provide a retentate containing the floc. The body of water is treated with a mixing means to minimize membrane fouling and to provide thorough mixing of the floc in the body of water.

대표청구항 ▼

[ What is claimed is:] [1.] A method of purifying water on a continuous basis to remove contaminants comprised of natural organic matter, color, turbidity, bacteria, cysts and oocysts, viruses, arsenic compounds and insoluble impurities, the method comprising the steps of:(a) providing a body of wat

[ What is claimed is:] [1.] A method of purifying water on a continuous basis to remove contaminants comprised of natural organic matter, color, turbidity, bacteria, cysts and oocysts, viruses, arsenic compounds and insoluble impurities, the method comprising the steps of:(a) providing a body of water to be purified in a single tank reactor;(b) controlling the pH of said body in a range of 5 to 8;(c) adding a coagulant to said body of water to cause said contaminant to form a floc therein;(d) maintaining said floc in said body in a concentration in the range of 2 to 6 gm/l and in a size range of 0.2 to 10 .mu.m for purposes of adsorbing at least one of the contaminants thereon to provide treated water;(e) removing a first portion of said treated water and said floc from said body of water to maintain said floc in said concentration;(f) providing a submerged semi-permeable membrane in said body of water in said single tank reactor;(g) removing a second portion of said treated water through a semi-permeable membrane having a pore size in the range of 0.01 to 1 .mu.m to provide a permeate comprised of purified water; and(h) treating said body of water with a mixing means to provide mixing of said floc in said body of water and to minimize membrane fouling, the above steps occurring in the single tank reactor.