Purifing Effect Of Free Water Face Wetland In Recycling Wastewater Landscape River For Eco-Restoration In TEDA

The research was one part of"water environment quality improment technology and integration projection",which was surported by national 863 programe of China. Through recycling landscape river projection in TEDA ,the thesis was focus on integrating and researching multi- technical system of eco-restoration and eco-purification for high-saliferous recycling landscape river in seashore and salina areas. On the basis of ecology,the core technologies of multi- technical system consist of rinsing salt with high-saliferous recycling water,preventing salt from the floor of salina, selecting and locating of salt-tolerant pioneer plants,and restorating riverside ecosystem.Based on the successful construction of the watercourse ecological restoration projection, this paper pays a research on observation of water quantity and quality of reclaimed wastewater landscape watercourse,regularity of water & salt movement and wastewater purification of surface flow wetland system. The results show that:<1> The rinsing salt effect of reclaimed wastewater landscape watercourse was obvious, the amount between rinsing salt and flow accumulation meet the parabolic equation: y=44.1x2-1555.4x+13273. According to this equation,while the flow accumulation reached 1008523 m3, salt washing process was completed.<2> The influent phosphorus nutrient salt were most phosphate in channel wetlands system, which made up to 92.14% of total phosphorus. Total phosphorus and phosphate concentration fluctuated between 0.093—4.870mg/L and 0.093—4.827mg/L, respectively. The effluent concentration of total phosphorus was 0.116mg/L, the average removal ratios of total phosphorus and phosphate were satisfied showing their removal of 85.40% and 92.86%. Channel wetlands system had a stronger resistance to impact load against its influent concentration. Seasonal changes also had a certain influence to the removal of total phosphorus and phosphate salt,there were higher removal ratios in summer and autumn than those in spring and winter. In addition to the impact of temperature,but also the effects of plant was contributed to the above result. Moreover, this study shows that the removal of phosphate and total phosphorus increased with increasing surface load. The removal was low while its surface load ratio was small; up to high surface load ratio the removal was high and stable. The low influent concentration of total phosphorus can lead to the release of sediment to phosphorus nutrient.<3> The influent nitrogen nutrient salt were most nitrate nitrogen in Channel Wetlands system, which made up to 67.78% of total nitrogen, ammonia nitrogen was 12.14% only; The influent total nitrogen concentration fluctuated between 0.722—36.691mg/L; Its effluent quality remained below 5 mg / L and the removal ratios remained at about 80%. Seasonal changes had some impacts on their removal,the removal ratios of total nitrogen in summer and autumn were significantly higher than those in winter and spring. But the ammonia nitrogen removal rate was generally lower than 50% or even negative, with its purification effect was poor and there were not some certain degree of regularity between the removal of ammonia nitrogen and surface load. In the study area, the removal amount of ammonium nitrogen increased with increasing surface load, but its removal rate was relatively stable over 90%.