Study On The Effect Of Rural Domestic Sewage Treatment By Soil-Plant Leakage System And The Effect Of Vegetable Waste Retting

This paper was supported by the key program of Hunan Provincial Department of science and technology support (project number:2010NK2006). Soil and plant leak this choice in different ecological areas of Hunan province2007～2010has implemented a model village of rural cleaning project of the purifying pool several, through field location sampling method, respectively, in the4seasons are all built a sewage treatment pool of water inlet and outlet, water, pH value, ammonia nitrogen, chemical oxygen demand. Determination of the content of total phosphorus index (COD), total nitrogen, soil and plants, study the percolation pond for rural domestic sewage treatment in Hunan province; and the simple natural retting method, studied the effect of the spring and summer season stacking leafy vegetable waste, through the above study, in order to comprehensively promote the construction of Regional Rural Clean Engineering, construction and provide scientific basis for technology and model of Hunan rural domestic waste harmless treatment and resource utilization. The main conclusions are as follows:(1) in different ecological districts, each year, each season, soil and plant lysimeter corresponding to export the192water samples, no significant difference in pH values, are in the national wastewater discharge standard (pH6-9) range; COD content at the outlet water samples are standard; the treatment efficiency of total nitrogen export water is better, decrease the rate of up to98.3%, the Taoyuan summer, spring, summer, autumn, Heshan, Ningxiang summer, winter, can all the standards, other ecological zone, seasonal compliance rate is more than75%; the treatment efficiency of ammonium nitrogen water export good, reduce the ratio reached86.3%, compliance rate was up to91%; processing efficiency the poor export water total phosphorus, although the lower rate is not low, but still appear compliance is low or not up to the standard of all. To sum up, removal of phosphorus by soil plant percolation pond treated sewage indicators has good treatment effect, even if not required, but because its content is low, can be directly used for farmland irrigation, so this technology is suitable for popularization and application in Hunan province.(2) the cabbage in spring and summer and summer bud white waste using bottled simple retting method retting15days after the treatment, the pH value in the neutral pH, soluble nitrogen to total nitrogen ratio of49-76%(ammonium nitrogen to total nitrogen of42～72%),soluble phosphorus and potassium were accounted for total phosphorus,total potassium and the ratio of26～43%and22～40%. Among them, summer bud white individual processing decomposition faster, content and cabbage separate treatment of the more high, the two mixed center. So in the average temperature of25～29℃, from protect environment and prevent volatilization loss of nitrogen as the premise, above the average content of ammonium nitrogen waste compost of leafy vegetables in total nitrogen treatment50%may be the end of retting, namely the retting time to10～15days is appropriate (high water content such as summer bud white leafy vegetables retting time can also lead to about10days).