The Biological Mechanism On Ecological Ditch Of Point Source Pollution Resistance Control Technology Of Hongfeng Reservoir

Over the years, due to the construction of environmental infrastructurelagging far behind after the economic development, a large number ofindustrial, domestic,agricultural wastewater and surface runoff is drained intoriver directly, a lot of sludge and decaying plant residue silting on the river, itexceed the capacity of environmental self-purification, which resulting inwater eutrophication; And people handle river straight and flat.Thoseresulting in further degrade the river ecosystems. At the same time, with theenhancement of people's environmental awareness, ecological concept and theimprovement of living standards. It is more and more urgent that resumptionof serious damaged river which is community's requirement. On the basis ofprevious research, illuminate the concept of ecological river restoration, learnfrom the experience of domestic and international river improvement, with theapplication of data analysis, site investigation Investigate Huangtuzhai basin'scurrent situation and analysis it's main ecological problems. On this basis,initially established a set of ecological river constructed system, and practicebuilding a typical engineering river ecosystem restoration project. After theconstruction of ecological river of typical reaches of Hongfeng reservoir, theobjectives' of this study are to identify the characteristics of the water nutrientsalt, plant community recovery,retention effect and the decline of the nitrogen, phosphorus of thewater, and retention effect of suspended particles and microbial denitrificationeffect on eutrophication. Research results are as follows:(1) Nitrogen and phosphorus pollution is main pollution in experimentalreaches, which is dramatic changes, while it is low levels and relatively stablein the upstream. Ammonia nitrogen, nitrate nitrogen are main form of nitrogencontent in the incoming water, and phosphorus exist in particulate form; Themain form of nitrogen nutrients in the effluent water is nitrite nitrogen, eachindex of water concentration significantly decreased before and afterconstruction. The effect of Eco-dich on river water quality improvement isobvious, and can effectively remove the mountain agriculture and ruralnon-point source pollutants, It is inflowing rivers pollution control technologyshould be promoted.?2? Under artificial assisted, the recovery of damaged river plantcommunities so as to improve the river self-purification ability of thetechnical route is feasible. The plant species of Hongfeng reservoir ecologyditches is scarce, mainly for emergent plants, including iris, water onion,yellow irises,its nitrogen and phosphorus removal capacity is good, is worthyof the dominant species. Experimental Zone of nitrogen, phosphorus nutritionelement analysis show, nutrient phosphorus excess, nitrogen is low and innitrogen limitation condition; Accounted for66%; aboveground nitrogen andphosphorus accumulation is far greater than the accumulation of nitrogen and phosphorus in the underground and if timely harvest some of the groundplants can be achieved good results; The decline wetland plants have ainfluence on water quality mainly in winter and spring and the impact cannot be ignored. Therefore, we must attach importance to the utilization ofaquatic plants harvest, so as to increase nutrient elements in the output, reducethe natural litter fall, litter decomposition caused by decreasing secondpollution, and reduce the deposition of biomass.?3?Microbial activity is also closely related to the removal of nitrogen andphosphorus, nitrite bacteria, denitrifying bacteria and ammonia waterindicators, TN are closely linked. Appropriate hydrophyte combinations canimprove the effects of nutrient removal. The combination of Acorus calamuswith Canna indica (MRJ+CP) had the highest removal rate of total nitrogen(TN), denitrification intensity and denitrifying bacteria has no significantcorrelation with total nitrogen removal. Acorus calamus with Canna indica(MRJ+CP) showed a significant effect for NH+4-N removal(96.75%),nitrification intensity and nitrite bacteria has significant positive correlationwith NH+4-N removal. The combination of Acorus calamus with Irispseudacorus (CP+HCP) had the highest removal rate of NO-3-N.?4?The dominant factor that have a influence on the river reservoirPurification of Water is the capacity of aquatic plant biomass, species diversityand plant configuration, microbial activity, and the correlation of humanactivities.