Performance Of The Iron-Carbon Coupling Constructed Wetland For Rural Sewage Treatment

In recent years,the problem of decentralized rural sewage treatment has attracted extensive attention in China.However,as of 2014,only about 8%of rural areas were distributed with drainage and sewage treatment systems.So a lot of untreated sewage to the point source and non-point source emissions,all kinds of pollutants into the river,the serious pollution of various water sources,leading to the emergence of many ecological problems including cyanobacteria etc..Therefore,it is very important to evaluate and improve the treatment technology of wastewater in rural areas.In this paper,the simulated removal of rural sewage was studied,and the removal efficiency of iron internal electrolysis coupled with constructed wetland was studied.After six months of plant growth,after the plant has grown steadily.The concentration of the start-up phase and stable phase of the effluent COD,PO43-and NH3+-N were studied by changing the residence time,and by using SAS statistical analysis method,the significance of different factor concentrations in effluent from different plant systems was compared to compare the performance of ICCW and CW in wastewater treatment.First,the study found that in the start-up phase,on the first day,COD and ICCW concentration in effluent phosphate system was lower than that of CW shows that the iron carbon removal of COD was increased,and it is found that the change in time,all systems in 6 days,the effluent concentration of COD,PO43-and NH3+-N can reach stability.In addition,in the stable stage,the effluent index of the plant system was analyzed at the stable stage by collecting and analyzing the effluent continuously.In the pH aspect,the new ICCW system shows high pH than the traditional CW system.Because the pH of ICCW system is larger,it means that the new system has the potential to deal with acidic wastewater.In the removal of phosphate,iron carbon micro electrolysis of compared with the traditional artificial wetland has higher removal rate,residence time of HRT in the 1 day,will be able to reach the level of A,it also has a higher removal load space PO43-.In addition,the removal rate due to distributed rural sewage,organic phosphorus is less,so the simulation of sewage is currently only adding inorganic phosphorus as the test condition,and only on the effluent of inorganic phosphorus were determined in this paper.When HRT is 3 days,the average PO43-removal rate of ICCW system can reach 97.55%,and the effect is the best,Whether it is CW system or ICCW system,windmill grass is very good for PO43-removal,Ferric hydroxide colloid novel coupling iron carbon system on PO43-removal effect of adsorption and flocculation of the ideal iron carbon micro electrolysis on degradation of pollutants in wastewater and the effect of adsorption.In addition,vertical flow wetland can achieve continuous treatment of rural domestic sewage,simple management,good removal of organic compounds in sewage,removal efficiency of about 85%,effluent CODcr concentration is lower than 50mg/L;N and P have a certain purification effect,PO43-removal effect is stable,the efficiency is about 90%.Through the preparation of cheap carbon powder and iron powder into iron carbon filler,and added to the packed column,the removal effect of COD and PO43-can be achieved,which is better than that of a single constructed wetland,and the removal effect is stable.In the absence of iron and carbon,the TP removal of sewage by the packed column is not obvious,and the effluent TP concentration is the worst compared with other treatment.When the HRT was 3 days,the removal rate of COD and PO43-was 95.80%and 97.55%for the new iron carbon system,respectively.At this time,the removal rate of COD and PO43-in the corresponding CW system was 66.74%and 90.48%respectively.At this point,the main role is micro-organisms.Internal electrolysis of iron and carbon can improve the treatment efficiency.In the treatment of adding iron and carbon,the removal effect of COD on the packed column was better than that without iron and carbon,and maintained above 85%.The iron carbon coupled constructed wetland has good removal effect and stable treatment trend for COD and PO43-.Therefore,through the experiment of domestic wastewater,through the new artificial system and artificial system coupling of iron and carbon,has the advantages of high efficiency and stable performance,at the same time because of high processing efficiency,therefore can reduce the wetland area,to achieve the purpose of reducing the construction area and construction cost,and reduce the traditional artificial wetland treatment the performance is susceptible to pests and diseases affect the performance of the risk,improve the stability of the system.At the same time,iron carbon internal electrolysis has good degradation properties.Therefore,the new system will be widely used in the fields of pesticide wastewater,printing and dyeing wastewater and pharmaceutical wastewater treatment.