Study On Evaluation Of Water Quality In Baiyangdian Lack And Purification Effect Of Eutrophication Water In The Artifical Wetland Of Lotus

Water pollution is a main factor causing shortage of water supply. Because of internal and external pollution sources did not get effectively control and treatment, Baiyangdian water quality is deteriorated gradually. In order to improve the water quality, various measures have been taken. Artificial wetland of lotus field is one of the most important ways to purify eutrophic water. In the purification process with artificial lotus field, farmers spend a large amount of fertilizer in lotus field, in order to pursue the high yield benefits. And then secondary pollution has been aroused.In order to provide more basical theory of planting purification in eutrophic water in Baiyangdian. The experiment based on Evaluation of Water Quality in Baiyangdian lack, studied the effectiveness on the removal of phosphorus, nitrogen and organic matter from eutrophic water and processing quality of hydroponic plants. In this test, the biological purification test concluding static simulation tests in lab and lotus field test and using green leafy vegetables as experimental materials has been carried out. Determine removal efficiency of total phosphorus,total nitrogen,ammonia nitrogen,chemical oxygen demand,and determine content of nitrate and heavy metal in vegetables, and judge the hydroponic vegetables in eutrophic water is consistent with the edible standard. It also researched purify effect of clay mineral which consist of Bentonite, diatomite, zeolite powder to deal with emergency abrupt changes of planting in the polluted water. The results show:1. The overall water quality nutritional status of BaiYangdian is moderate. The water of NanLiuzhuang is the most serious pollution degree, belong to a bad classⅤ, water quality is not up toⅣsuch requests; The water quality of ShaoChedian ZaoLintai CaiPutai DuanCun GuangDian ZhangZhuang belong to a classⅣ, which is not up toⅢsuch requests. The water quality of ZaoLinzhuang CaiPutai DuanCun WangJiazhai is medium eutrophication, the water quality of QuanTou GuangDianzhangzhuang ShaoChedian is mild eutrophication, the water quality of NanLiuzhuang is severe eutrophication. Over the standard rate of Ammonia nitrogen and total phosphorus is One hundred percent.2. There is the effectiveness on the removal of phosphorus, nitrogen and organic matter from eutrophic water .The removal effect of total phosphorus is best and the to removal effect of chemical oxygen demand is worst in the purification process of eutrophic water with lettuce and rape in the indoor simulation experiment. The purification rate of the main pollutants in sewage in the indoor simulation experiment, which purifying rate by vegetable respectively is total phosphorus 96%~97%, ammonia nitrogen 97%~98%,total nitrogen 82%~88%,chemical oxygen demand 24%~28%,Actual purification rate is total phosphorus 32%~36%, ammonia nitrogen 6%~14%,total nitrogen 12%~18%,chemical oxygen demand 6%~13%.In the lotus field experiment, the purification rate of the main pollutants in sewage is total phosphorus 40%~54%, ammonia nitrogen 89%~93%, total nitrogen 55%~57%, chemical oxygen demand 75%~82%, Actual purification rate is total phosphorus 18%~32%, ammonia nitrogen 4%~16%,total nitrogen 9%~11%,Chemical oxygen demand 3%~12%, the purification rate of total phosphorus total nitrogen ammonia nitrogen of the indoor simulation experiment is significantly higher than the lotus field experiment. the purification rate of chemical oxygen demand of the lotus field experiment is significantly higher than the indoor simulation experiment, but actual purification rate of indoor simulation experiment is a little higher than the lotus field experiment.3.The removal rate of bentonite, zeolite powder, diatomaceous earth of nutrient salt and organic in water respectively is total phosphorus 44.22%,32.54%,66.14%;ammonia nitrogen 96.04%,51.48%,69.43%;total nitrogen 82.67%,74.28%,2.58%;chemical oxygen demand 38.96%,72.10%,70.93%.Overall, the three kinds of clay minerals on the removal effect of ammonia nitrogen is the best, especially the bentonite, the purification rate is high up to 96%, The total nitrogen removal rate of diatomite is only 4.37%.Paper studied the purification effect of eutrophication water use hydroponic vegetables and clay mineral, And proposed a practical technology of eutrophication control and water self-purification. The technology would be positive for disposal purification of village sewage in the future.