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STUDIES ON WATER MANAGEMENT ISSUESE Part 12

Tham khảo tài liệu 'studies on water management issuese part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 210 Studies on Water Management Issues Results and Discussion Most TW were satisfactory efficient in BODs and COD removal and only partly efficient in N and P removal. The TW for industry were constructed for the treatment of food processing wastewater characterized by high COD BOD5 and ammonia nitrogen and for dye-rich textile wastewater. The results indicated that TW can be an appropriate technology for the treatment of wastewaters from those industries because the outflow parameters reached the prescribed legislation standards Griessler Bulc Ojstersek 2008 Zupancic Justin et al. 2009 . Two pilot TW were constructed at the end of 2005 for the treatment of water from drinking water wells polluted with pesticides atrazine metholaclor and pathogens. The results showed the removal efficiency of E.coli from 130 to 500 bacteria 100 mL at the inflow to 0 to 3 bacteria 100 mL at the outflow from TW Istenic et al. 2009 . Regarding the pesticides removal bentazon was reduced from 1.8 pg L at the inflow to 0.06 pg L at the outflow metholaclor from 0.73 pg L to 0.05 pg L and terbutylazine from 0.53 pg L to 0.03 pg L LIMNOS Ltd. results not published . TW for highway run-off treatment showed 69 removal efficiency for suspended solids 97 for settleable solids 51 for COD 11 for BOD5 and 80 for Fe. Heavy metals Cu Zn Cd Ni and Pb were below the legislation limits at the inflow with the reduction efficiency in the system of over 90 while the concentrations of N and P showed a low level of nutrients for biological processes Bulc and Sajn Slak 2003 . The TW for gray water was constructed in 2011. Preliminary data showed that gray water was mostly lost due to evapotranspiration. The TW for landfill leachate were constructed for the landfill sites that cover approximately 0.5 to 2 ha. With regard to the studied parameters the performance of TW was not influenced by annual seasons but primarily by precipitation. The reduction efficiency reached on average 50 for NH4-N BOD5 and COD .