Zenon Environmental Inc.

Andrew Benedek

Hadi Husain

Anthony A Tonelli

Susan L Wesno

Eric Harrison

Manwinder Singh

Riad A Al-Samadi

A method of producing high purity water using weak acid cation exchange for dealkalization and a double pass reverse osmosis membrane system having enhanced membrane life.

High purity water production using ion exchange

A method of producing high purity water using dealkalization and a double pass reverse osmosis membrane system having enhanced membrane life.

High purity water production

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.

Process for purifying water using fine floc and microfiltration in a

Disclosed is an improved method for extending the useful life of a reverse osmosis membrane having a high pressure side and a low pressure side, the membrane used for separating soluble and sparingly soluble inorganic materials from an aqueous solution, the process comprising introducing an aqueous solution containing the soluble and sparingly soluble inorganic materials to the high pressure side of a reverse osmosis membrane and pressurizing the aqueous solution on said high pressure side to produce liquid on the low pressure side substantially free of said inorganic materials. Solution containing concentrated inorganic materials is transformed from the high pressure side of the reverse osmosis membrane to a high pressure side of a microfiltration membrane, and soluble inorganic materials transferred to the high pressure side of the microfiltration membrane was precipitated to provide solution containing particles of the inorganic materials.

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Toronto, Canada

Andrew Benedek