Research On The Filtration System Of Farmland Drainage Ditch Construction And The Embankment Material

As the transitional zone of Agricultural Non-point Source Pollution Source and the receiving water such as river and lake, farmland drainage ditch has remarkable effect on the whole farmland ecosystem and circumjacent water ecosystem.According to the present situation of farmland drainage ditch, job of this thesis is devoted to the development and manufacture of new ditch embankment material which is a kind of Pervious-Straw Concrete. The organic combination of this embankment material and drainage blanket material can construct a complete Filtration System of Farmland drainage ditch, which can reduce the Agricultural Non-point Source Pollution and improve agricultural environment through physical absorption, plant absorption and microbiological degradation, etc.This paper research results as follows:(1) Puts forward a definition of Filtration System of Farmland Drainage Ditch, describes its connotation, also systemic analyzes the composition, characteristics and functions of this system.(2) Analyzing the relations of each physical properties indexes of Pervious-Straw Concrete by experimental study, finding main influence factors, and the value range of them, then arranging mix proportion to conduct the orthogonal test, so as to find a superior plan through analyzing the test results.(3) Discusses the functions and kinds of drainage blanket material, and analyzes from several aspects such as permeability performance, drainage effect, durability and economic practicality of farmland drainage channel materials by contrast test, then finally confirms the best com??tion of permeable and drainage materials.(4) Analyzing the alkali loss in this kind of permeable embankment materials surface by immersion test of Pervious-Straw Concrete. And analyzing the effects of this kind of embankment materials on the growth environment of microorganism community by microorganism adsorption test of Pervious-Straw Concrete. Then by simulation test of nitrogen and phosphorus interception, analyzing the influential action on agricultural ecological environment by the Filtration System of Farmland Drainage Ditch, which is made up of this permeable embankment materials. Study on the filtration system of farmland drainage ditch of this paper, enriches the research contents of farmland soil and water environment and ecosystem, and provides a new ideal for controlling and removing agricultural non-point source pollution.