Study On Turning-Complex-Flow Constructed Wetland To Treat Wastewater

Currently a lots small towns have appeared serious water pollution in Shanxi Province. It needs to look for an effective, economic and operation convenient wastewater treatment technology. Constructed Wetland is a new technology for sewage treatment developed these years .It have all above characteristic and also can treat various wastewaters. This project brings up to make full use of foreland and unused land of Xi'an region to establish constructed wetland system to effective and economic treat sewage water.The different region have the different weather ,vegetation type and geography circumstance,experiment considering situation of present sewage waste drainage, water body pollution and wetland distribution ,use turning-complex-flow constructed wetland to treat sewage waste secondary effluent and Endocrine-disrupting chemicals.The turning-complex-flow constructed wetland using hydrolyze acidification as pre treatment treat sewage waste. Average wetland influent norm is COD 254.95mg/L,BOD5 84.81mg/L,NH3-N 19.89mg/L,TP 3.30mg/L, average wetland effluent concentration is COD 22.03mg/L,BOD5 0.9mg/L,NH3-N 4.708mg/L,TP 0.33mg/L in experiment. Constructed wetland has effective treatment for sewage waste, its effluent concentration reach sewage treatment plant drainage standard I . Constructed wetland use for advanced sewage waste treatment , it's average wetland effluent concentration is COD 67.2mg/L,TN 27.7mg/L ,NH3-N 22.8mg/L,TP 3.30mg/L, effluent concentration is COD 12.04mg/L,TN10.588mg/L ,NH3-N 3.37mg/L,TP 0.33mg/L. .It is effective for N and P removal, its effluent norm all can reach the advance treatment require. LAS average concentration is 1.497mg/L, ArOH is 0.04mg/L in sewage waste. Average removal rates of two substance are all 85% in wetland. PK Hg average influent concentration is 0.45 mg/L,0.031 mg/L in simulation experiment, average removal rates is 95.56%,73%.Constructed wetland has effective purification for Endocrine-disrupting chemicals. The ArOH influent concentration below 1.0mg/L, its removal rates is 100% for wetland . ArOH removal rates can promote 15%when wetland have artificial aeration . The experiment system can reach the highest removal rates when LAS influent concentration is about 1.5mg/L. The wetland exists the best LAS influent concentration. Retention time have great impact to removal COD, TN ,but its have little impact for NH3-N,TP.The turning-complex-flow constructed wetland remove TN according to first pushing reaction and calculate reaction kinetics equation coeffient K=0. 92. When wetland runs 05 year, its actual capacity will reduce about 30%.The wetland is clogging, the effluent quality worsen. It's should take proper measure to reduce wetland clogging degree.