Status and needs Zhibin Zhang Yanhao Zhang zhazhb163
- Slides: 32
Status and needs Zhibin Zhang, Yanhao Zhang [email protected] com Shandong Jinazhu University
CONTENT § National, regional and international status of wastewater treatment § Challenges with wastewater: environmental, health and aesthetic aspects § Legal aspects: national, regional and international practices Status and needs
1. National, regional and international status of wastewater treatment n Basic theory on the wastewater treatment n Basic process on the wastewater treatment Status and needs
Basic theory on the wastewater treatment a. Physical purification Dilution l Convection ： Movement of pollutants in the direction of water flow l Blend l Precipitate l volatilization l Status and needs
Status and needs
b. Chemical cleaning l Oxidation reduction l Acid base reaction l Adsorption and condensation c. Biological degradation l Aerobic l Anaerobic l Anoxic Status and needs
Status and needs
Status and needs
d. Phelps equation Two hypotheses: l The degradation rate of organic matter is only related to the concentration of organic matter. l Only aerobic microorganisms are involved, by atmospheric oxygen Status and needs
Oxygen consumption kinetics of organic compounds L-------Organic matter concentration k 1 ------Oxygen consumption rate constant Status and needs
Kinetics of the change of dissolved oxygen D-------Oxygen deficiency D=C 0 -Cx k 2 ------Oxygen recovery rate constant Phelps equation Time to reach the point of oxygen Status and needs
BOD and DO （mg/L ） Clean Zone Contaminated Zone sewage Status and needs Time Recovery zone Clean Zone
Basic process on the municipal wastewater treatment Status and needs
Status and needs
Efficiency of treatment stages Process Primary method Treatment efficiency（%） SS BOD 5 Precipitation method Precipitation (natural precipitation) 40～ 55 20～ 30 Biological membrane method Primary sedimentation, biological membrane method, two precipitation 60～ 90 65～ 90 Activated sludge process Initial sedimentation, biological reaction tank, two precipitation 70～ 90 65～ 95 Secondary Status and needs Main process
2. Challenges with wastewater: environmental, health and aesthetic aspects • Inorganic pollutant • Organic pollutant Status and needs
Inorganic pollution l Acid and alkali pollution: industrial wastewater, acid rain l Nitrogen and phosphorus pollution: eutrophicaiton l Sulfate and sulfide pollution l Chloride contamination l Heavy metal pollution Status and needs
• The harm of eutrophication ØWater quality becomes muddy ØReduction of dissolved oxygen ØAlgal toxins ØIncrease color, smell ØGeneration of precursor ØIncrease the cost of water supply plant ØDestruction of aquatic ecology Status and needs
Water shortage in Wuxi city in 2007 Because of Taihu eutrophicaiton Status and needs
Polar bear with green fur Status and needs
Organic pollution l Oil pollution l Phenol pollution l Surface active agent pollution Status and needs
3. Legal aspects: national, regional and international practices l l l China Germany Norway Poland Sri Lanka Ukraine Status and needs
China Wastewater pollutant discharge standards are based on the quality standards of water environment. “Surface water environmental quality standards（GB 3838 -2002）”，It divides the waters into five categories. Class I, mainly applied to the source of water，National Nature Reserve Class II, mainly used in surface water source protection area Class III, mainly applicable to the two level of protection of surface water，fishery waters and swimming areas. Class IV, mainly applicable to general industrial water and recreational water. Class V, mainly applicable to agricultural water district and the general landscape requirements of water Status and needs
Status and needs
Water pollutant discharge standards are also classified into national standards and local standards in China. l National standards l Local standards Status and needs
Related national municipalwastewater discharge standards （1）Pollutant discharge standard of urban sewage treatment plant GB 18918 -2002) （2）Classification of urban sewage recycling and utilization GB/T 18919 -2002 （3）The city service water quality and city wastewater reclamation GB/T 18920 -2002 （4）Urban sewage regeneration and utilization of landscape water quality GB/T 18921 -2002 （5）Municipal wastewater reclamation and reuse of groundwater recharge GB/T 19772 -2005 （6）Urban sewage recycling and utilization of industrial water quality GB/T 19923 -2005 （7）Water quality standard for landscape and recreation GB 12941 -91 （8）Water quality standard of reclaimed water reuse for landscape water body CJ/T 952000 （9）Water quality control standard of reclaimed water used as cooling water GB 503352002 （10）Recommended water quality standards for reclaimed water used as cooling water CECS 61： 94 Status and needs
Related local wastewater discharge standards Shandong Province （1） Comprehensive discharge standard of water pollutants in the peninsula of Shandong Province（DB 37/676 -2007）2008 -04 -30 （2） Standard for comprehensive discharge of water pollutants in Haihe River Basin of Shandong Province (DB 37/675 -2007)2008 -04 -30 （3） Shandong province water pollutants discharge standard of Xiaoqing River Basin (DB 37/656－2006)2008 -04 -30 （4）Comprehensive discharge standard of water pollutants along the line of the south to North Water Transfer in Shandong Province (DB 37/ 599－ 2006)2008 -04 -30 Status and needs
Germany Status and needs
Norway Status and needs
Poland Status and needs
Sri Lanka Status and needs
Ukraine Status and needs
