| Nowadays, water pollution and eutrophication problem of rivers and lakes in China are becoming more and more serious, therefore, it is urgent for social economic development and ecological environment construction to deal with the contaminated water bodies. Aquatic vegetation restoration is an important fact in water recovery and integrated management of ecological system. In recent years, ecological-floating beds and constructed wetlands are used at home and abroad for the ecological restoration of water purification. Using compound microorganism product is a newly pollution control technology developed in recent years at home and abroad. It is considered to be one very promising water pollution control technology because of its simple craft, small destroy to location, fast, thoroughly degrading, less secondary pollution, etc.The paper relies on the Shanghai World Expo Science and Technology project (2007BAK27B05-7) "The application and demonstration of ecological restoration Expo landscape water technology" and the Shanghai Environmental Protection Bureau project "Study on derived river water purification of Drip Lake" (No.2006-36), etc. This paper mainly studied the effectiveness of the ecological floating bed and the constructed wetlands in the conditions of static and different hydraulic loading about water purification. Pollutant transform to be enhanced and water environmental quality to be improved by adding compound microorganism product to the system were studied in this thesis. Also in this paper, anaerobic digestion of plant residue from eutrophic water is discussed to achieve re-use of resources.the main conclusions are drawn as followings:1) The effect of water purification by ecological floating bed was studied in this paper. Results showed that the removal effect of floating bed on CODMn, TN, TP is obvious.16.9%CODMn,50.3% TN and 50% TP were removed by ecological floating bed in static condition and the water quality achieved gradeâ…¢,the criteria is stipulated for ground water by our country. It showed us that the eutrophication phenomenon can be improved significantly through the ecological floating bed.2) Comparison of water purification by ecological floating bed and constructed wetland was studied in this paper. In general case, water quality improved by the ecological floating bed is slightly significant than the constructed wetland. Results showed that in ecological floating beds, CODMn,NH3-N,TN and TP were removed by 37.6%,89.9%,81.45% and 65.5% while removed by 10.1%,46.7%,81.81% and 61.0% in the constructed wetland during the static phase condition. The comparison in dynamic condition showed that on the overall removal of pollutants, ecological floating bed is still higher than the wetland. In the hydraulic loading of 0.035m/d, the ecological floating bed CODMn removal was rate up to 41.92%, while TN removal rate up to 77.1%; In the hydraulic loading of 0.12m/d, the ecological floating bed NH3-N removal was rate up to 91.28%, while TP removal rate up to 87.4%.3) The effect of water purification by compound microorganism product was studied in this paper. Through using different compound microorganism product combining with plants and filler, better treatment effect would achieve when the compound microorganism product combined with the plant as a carrier than combined with the filler. Meanwhile, the results of batch test show that the indigenous microorganism in the river played the important role under the appropriate condition. As the compound microorganism product combined with the carrier,2# (compound agents+ nitrifying bacteria, yellow iris carrier) got the highest removal rate of CODMn 95.84%,4 # (compound agents+nitrifying bacteria+ECNU nitrifying bacteria+photosynthetic bacteria, yellow iris carrier) got the highest removal rate of TP 86.48% and TN 96.60%, they also have good ability to increase dissolved oxygen and ammonia oxidation.4) Aquatic residues could be used as a raw materials for methane fermentation to reuse resources. Inoculation of the sludge and PH value would affect the process of gas produce. The results showed that 600ml/L sludge inoculum concentration, higher pH and acclimated sludge are favorable to the digestion and generation of biogas. |
PDF Full Text Request