Patent ID: 8357305
Filing Date: 2013-01-22
Classification: C02F

Abstract:
1. A pre-treatment method for ultraviolet light disinfection of water streams having suspended solids in a liquid fraction with ultraviolet light irradiation from a uv light bank with uv light tubes, comprising: a. injecting sulfur dioxide (SO b. removing and disposing of the suspended solids from the acidified liquid fraction forming a recovered treated water, c. passing the recovered treated water between the light tubes for exposure to ultraviolet light sufficient for disinfection, producing a disinfected recovered treated wastewater, and d. adjusting the pH of the disinfected recovered treated water with a calcium alkaline source to adjust the pH and calcium ion concentration of soils and applying the disinfected recovered treated wastewater to soils to provide soil Sodium Absorption Ratios (SAIL) less than 15, Electrical Conductivity (EC) less than 2 dS m