October 2016 Vol. 71 No. 10
Business
CH2M Delivers Sustainable Solutions
A six-month pilot test conducted by CH2M under a tailored collaboration project between Tucson Water and the University of Arizona for the WateReuse Research Foundation, confirmed the viability of potable reuse as a renewable water source for the future.
When considering potable reuse, water quality is a big factor. Critical considerations include partial reduction of total dissolved solids (TDS), multiple barriers for trace organics and pathogens, and reduction of total organic carbon (TOC) to control the formation of disinfection byproducts (DBPs) during distribution.
Equally important is cost-effective and environmentally sustainable management of waste streams generated, including concentrated salt. The proposed treatment scheme for Tucson addresses these concerns using short-term soil aquifer treatment (SAT), slip-stream nanofiltration (NF), ozone oxidation and biologically active carbon (BAC) filtration. The findings are also significant as an alternative to reverse osmosis (RO) treatment for application in other inland states with limited concentrate disposal options.
In other news, CH2M was appointed to Welsh Water’s Water Resource and Drought Planning Consultancy Framework to build a 25-year strategy for managing water resources to ensure sufficient water supplies across most of Wales, Herefordshire and parts of Deeside.
CH2M and its team of sub-contractors will provide water resource planning, modeling and drought planning services. Together, the team will support Welsh Water’s ability to assess and forecast the water supply and demand bases, evaluate risk and uncertainty in long-term planning and investment decisions, and develop action plans for future drought scenarios.
When completed, the plan will take in account climate change projections, population growth and new developments planned across Wales, as well as future challenges, such as a growing economy and population, and meeting environmental objectives.
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