| With the continuous enhancement of human activities, eutrophication process is being intensified, becoming one of the most significant environmental problems, water safety issues have became important factors which threaten human beings’ survival and development. Traditional wastewater treatment technology exists disadvantages, such as easy to introduce secondary pollution and handling high cost, and for sewage nitrogen, phosphorus and other nutrients treatment effect is ineffective, this is one of the important causes of the treated effluent to accelerate eutrophication. Periphytons as one of the freshwater ecosystems’s important primary producers, their population structure is complex, have a huge biofilm area, can be more rapidly exchange substances with water, their growth and proliferation process can consume a lot of nitrogen, phosphorus and other nutrient salts of water; and periphytons as a part of the food web, can be absorbed by scraped feeding water feeding fish or other small, miniature aquatic animals, nitrogen, phosphorus recycling into the ecosystem, not cause secondary pollution. Therefore, the use of raw periphytons eutrophic water ecosystem restoration has good prospects and development potential.This paper aims to study the periphytons in Lake Wuli bamboo on artificial substrate colonization patterns, explore the research community structure characteristics of periphytons colonization process, change the density, biomass and biodiversity over time to build the group and synchronize analyzes of different nitrogen and phosphorus levels and under different conditions on the removal of nitrogen and phosphorus than the raw correlation algal density, biomass and water physical and chemical indicators, and studied under laboratory conditions with periphytons manually configure wastewater nitrogen and phosphorus effect, with a view to the periphytons in the ecological restoration of water eutrophication process engineering to provide a scientific basis for the use of basic nature. At the same time, provide some reference to eutrophication causes and trends in Wuli Lake.By May 5,2013 to June 2,2013 with the birth of Wuli Lake 4-week study of periphytons colonization patterns on bamboo artificial substrates to explore the algal community structure colonization process, the dominant species, density biomass characteristics and the evolution of biological diversity. The results show that:the periphytons colonization process can be divided into four phases, namely pre-built base, exponential growth, maturity and decline of secondary season. Colonization process were identified with periphytons 35 genera and 55 species, including diatoms occupy a major advantage, a total of 12 genera and 29 species, 52.73% of the total number of species; followed by Chlorophyta,17 genera and 18 species, accounting 32.73%. Colonization during the first dominant species Navicula pupil, dominance size was 0.42;range of periphytons density is 0～20336.44 ind./mm2, the average density of 8993.12 ind./mm2, maximum density appear in the first 11 days; range of biomass is 0～5.84×10-2mg/mm2, average biomass was 2.54×10-2mg/mm2, the maximum in the 22th day. During the study period, the periphytons Shannon-Wiener diversity index, Pielou index ranges and species richness 0～3.88,0.51～1 and 1.47～2.81, respectively, indicating that the community structure of Wuli Lake periphytons complex species diversity is good.By simultaneous monitoring of construction sites cohort study of physical and chemical indicators of water, and with the periphytons density, biomass, and each day the number of algal species Pearson correlation analysis. The results showed that algal density, biomass and water environmental factors in CODMn, SD, TN, TP and PO43-P was a significant positive correlation (P<0.01), and NH4+-N was a significant positive correlation (P<0.05), and the relevance of other water bodies physical and chemical indicators were not significant; algal species number and TP and NH4+-N was a significant positive correlation (P<0.01), and water bodies SD, TN was a significant positive correlation (P<0.05), and other bodies of water physical and chemical indicators of correlation is not significant, indicating that the periphytons density, biomass and number of species of periphytons on the water changes significantly in response to environmental factors.Under laboratory conditions, the study of periphytons under different nitrogen and phosphorus levels and different conditions for the removal of nitrogen and phosphorus than manual configuration wastewater nitrogen and phosphorus. The results show that when a nitrogen content, the nitrogen removal rate algal communities with increasing concentration of phosphorus (P ratios decrease) increases; phosphorus ratio and the same case, the initial concentration of nitrogen is small, the raw higher nitrogen removal efficiency of periphytons; addition, the initial nitrogen content is large, removal is also larger. When certain phosphorus content of periphytons for phosphorus removal with decreasing concentration of nitrogen (nitrogen and phosphorus ratio decreases) increases; nitrogen and phosphorus ratio and the same conditions, the initial concentration of phosphorus is small, the larger the corresponding removal; higher initial levels of phosphorus removal of a large amount. |
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