Ecological Restoration Technology And Applied Research Of Tidal River Heavily Polluted Area

Large and small tidal river in the Pearl River Delta Region have more than4,900, a length of about10000km. River in the Tidal River Networks is low and flat, and by tidal backwatering time effects, water reverberate back and forth, poor flowability, and water pollution become increasingly serious in recent years. The study is on the basis of analyzing pollution status and characteristics of tidal river in the Pearl River Delta Region, as well as accessing to related information of tidal river pollution problems, using to Floating-set aeration biological filter placed in the heavily polluted area of tidal river, new method of ecological restoration as the core of improving self-purification capacity of tidal river.The specific research content and conclusions are as follows:According to heavily polluted area of tidal river ecological deterioration, the ebb and flow, the water level variable, designed a Floating-set aeration biological filter system, which consisted of Geonet wrapping with mesh lightweight biological carrier, water distribution pipe, aeration tube, aeration head, float, fixing lever and other key components, and analyzed the various parts of the structure and material selection.Taking Four Square pond sewage of Xiaoxiang community of Dongguang city in heavily polluted area of the Pearl River Delta tidal river network as test water, experimental research on a pilot-scale (hanging membrane) for Floating-set aeration biological filter system is Carried out. The research results show that the adding efficient microbial flora can speed up the hanging membrane process of biological aerated filter, and when removal efficiency of NH3-N, CODcr, TN, TP and other pollutants were stable at83.63%,52.30%,49.01%,9.80%, indicating that the microorganisms hanging membrane stability.In order to test application effect of Floating-set aeration biological filter system, Select heavily polluting xia Lang creek tributary of Xiaoxiang community in Dongguang city as test point, In the case of not interception and not dredged sediment, conducted the practical application of engineering research for system. The results show that. Compared with the Blank river, various water pollutant indicators of Demonstration river improve markedly, eliminate basically black-odor of river. Average removal rate of ammonia nitrogen, CODcr, IP and suspended particulate matter can respectively reach71.57%,61.33%,56.22%,68.83%. system fully adapt to tidal characteristics of tidal river during operation, can improve river’s ecological environment in a short time, improve its ability of self-purification.By analyzing removal situation of pollutants as well as data processing, conducted exploratory research for purification mechanism and dynamic model of system, Provide auxiliary support for its promotion application. The results show that, system will be purified which analysis that mainly by the results of biological oxidation decomposition, carrier filtering role, hierarchical predator role of food chain as well as synergistic effect of microorganisms and carriers and other combined effects, And in the case assumption that system is the ideal plug-flow reactor, by setting test conditions to deduce CODcr kinetic model of system is ln(c/C0)=-0.000211(A/Q)C01.062H (R2=0.987)...