Water & Wastewater Asia Jul/Aug 2018

WATER & WASTEWATER ASIA July / August 2018 Parameter U.M Value Feed Value Evaled ® distillate (RO Concentrate) Total Solid (TS) % 11.5 - Conductivity microS/cm 53100 <200 Chemical Oxygen Demand (COD) mg/l 61700 <500 Sulfate (S04) mg/l 28900 <50 Quality of the feed and of the treated stream produced by the Evaled ® units, with reductions on the main parameters higher than 99 per cent. Landfill leachate treatment is gaining interest due to regulations that are getting stricter in several countries Traditionally, common techniques applied to landfill leachate treatment are evaporation, membranes techniques, biological treatment and chemical-physical treatment. These technologies are chosen based on several aspects such as quality and analytical characteristics of the leachate, expected quality of the treated stream, quantity to treat and availability of some energy sources. For this particular landfill, the 15-year-old landfill in Guangdong, China, recently expanded in order to comply with the latest regulation using a system comprising of membrane bioreactor (MBR) and nanofiltration (NF) methods as well as the new raw leachate.The plant, made by reverse osmosis (RO) system, is in operation producing a brine that needs to be managed and reduced. Landfill leachate treatment i s ga i n i ng i n t e r e s t due t o regulations that are getting stricter in several countries. Landfill leachate is produced by water percolation through garbage and i s a ve r y po l l u t ed e ff l uen t , characterised by high levels o f ammon i a , COD , sa l i n i t y (chlorides and sulphates) and heavy metals. Sludge to dispose Treated water 24m 3 /day @TS 11.5% ~20m 3 /day ~4m 3 /day @TS~70%