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Land treatment system is a wastewater treatment ecological engineering technology, the principle is through farmland, woodland, reed and other soil - microorganisms - plant systems biology, chemistry, physics and other fixed and degradation (such as soil filtration, soil particles and plant roots adsorption, biological oxidation, ion exchange, microbial degradation) of pollutants in sewage purification and sewage and realization of nitrogen, phosphorus and other resources to be exploited, and ultimately stabilized sewage harmlessness and resource, is a low-cost, low-power water purification methods. This article from laboratory and field test consisting of two parts, the main research land treatment system for a typical river of sewage purification, as well as pollutants in sewage treatment systems in land concentration inside and analyzed the water load on the system, the treatment effect . The results showed that: (1) indoor trials at different depths within the model changes in the concentration of each pollutant is more complex. In the model the water during the pollutant concentration of each point varies greatly. At the appropriate water flow rate, concentration of pollutants each point is relatively stable, and similar trends. The test different depths in the soil, the concentration of pollutants each point there is no obvious correlation. (2) in the indoor model test, the first paragraph along four models of ammonia, COD has stable and high removal efficiency, removal rates were 80% and 90%, along relatively large changes in phosphorus effluent concentration With the influent concentration change, the final removal of 50% to 80%. (3) Depending on the season and the wild slopes of different influent loading, along each pollutant removal efficiency is also different. November, plants and gravel slope slope of ammonia nitrogen removal rate of 90%, mainly in the removal of the first paragraph; two kinds of slopes within the COD concentration is along the linear decline, and ultimately the removal rate of 50% to 75% ; gravel slope on the color removal rate of 80%, while only 35% of plants sloping removal; two kinds of slope for nitrate removal rate is about 50%. July, two kinds of slopes along the ammonia concentration fluctuations, but the final effluent concentrations lower than 50% removal rate; two kinds of slopes within the COD concentration is along the linear decline, and ultimately the removal rate of 50% to 75 % between; gravel slope on the color removal rate of 80%, while only 50% of plants sloping removal; two kinds of slope for nitrate removal is only 20% to 30%. (4) laboratory and field tests, the influent load for each pollutant removal efficiency greater than the impact. The results showed that nitrogen removal influent loading effect is greater than the COD removal, so choose a reasonable influent loading, can be nitrogen as the main design parameters.
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