Upgrading an Existing Beverage Wastewater Treatment Plant Utilizing Membrane Bioreactor Technology for Water Reuse Applications.

摘要

Water scarcity is a global concern entering the twenty-first century and a global water crisis threatens the security, stability and environmental sustainability of all nations. Water is the main ingredient in every product of The Coca-Cola Company (Company), and this natural resource is facing unprecedented pressures. For this reason, the Company is committed to water resource sustainability and supply reliability through a variety of approaches. One such approach includes reductions in the overall water use ratios (WUR) at an individual plant level. WUR is a measure of the amount of mcoming water required to produce an equivalent volume of product (i.e. 2 gallons of water per 1 gallon of product). The Coca-Cola North America (CCNA) American Canyon Production Facility, located in American Canyon, California, produces a range of fruit-juice based products. The facility's city water intake for overall production and utility purposes is limited to 455,000 gallons per day (gpd) and the publicly owned treatment works (POTW) limits the amount of wastewater the facility can discharge to 125,000 gpd. Excess wastewater must be hauled offsite or reused within the facility. Every gallon of city water used for utilities is potentially lost product water given the water intake limits. The existing Wastewater Treatment Plant (WWTP) at the American Canyon facility treats approximately 150,000 gpd of mcoming wastewater with primary treatment including pH adjustment followed by two 150,000 gallons equalization tanks. Secondary treatment includes an Upflow Anaerobic Sludge Blanket (UASB) Reactor followed by Aerobic Trickling Filters and solids separation using Dissolved Air Flotation (DAF). Tertiary treatment includes an Ultra-Filtration (UF) and Reverse Osmosis (RO) membrane system with the permeate (filtrate) collected for beneficial reuse within the facility and concentrate (retentate) discharged to the publicly owned treatment works. In addition to meeting overall discharge Permit contaminant limits, the goal of the overall WWTP operation is to maximize the effectiveness of the tertiary UF/RO system in terms of water that can be returned to production operations for utility purposes. In addition to ensuring that the 125,000 gpd discharge volume limitation is met, the more water that can be reused allows more of the maximum raw water intake volume of 455,000 gpd to be used for finished juice products (revenue producing).