| In recent years, with the rapid development of our agriculture, the agricultural product processing rise rapidly. However, with the rapid development of agricultural product processing, a rapid release of sewage wastewater occurs day by day and environmental pollution problems are growing increasingly prominent. The agricultural products processing enterprises are consisting mainly of dispersion small processing enterprises, they are in a serious shortage of environmental attention. The agricultural products processing wastewater with a large number of organic discharged to canals and rivers without treatment., so the river and underground water are seriously polluted, water quality of rivers and ponds is in the black, stinking change, fish and shrimp disappeared, the ecological environment is destroyed seriously. Agricultural product processing waste pollution has become the "bottleneck" of ecological agriculture development and sustainable social and economic development.This research addresses the research status and some existing problems in the vegetable processing wastewater reuse ,it is themed with energy conservation and emission reduction, and sustainable utilization of water resources and ecological environment protection, guided by the sustainable development theory, it chose eight lake town hedong district as areas of interest. In order to study coordinated and balanced program of development of the regional society, economy, resources and ecological environment, this paper starts with obtaining firsthand material by means of field survey, collection, monitoring and experiment. It's based on the composite system containing the social economy and ecological environment and water resources of the research area, using modern science and technology method, systematically studies wastewater utilization technology and related countermeasures in the vegetables processing enterprise of eight lake town. Through systematic analysis and experimental research, the main achievements in theory, technology , method, mode and measures countermeasures are as follows:(1) Through the analysis of the wastewater treatment and utilization situation in the world, the practice application, the research direction ,development trend, the existing problems and the actual conditions of our country and social development needs, it points that wastewater reuse is the inevitable requirement of society sustainable development, and it's one of the urgent items to be resolved in our reality.(2) Through the study and analysis of regional basic research, it reveals the order of nature and economic and social development, especially the vegetable processing enterprise's development evolution discipline and development trend, it gets that it's an urgent affair to carry out water reuse in regional areas, and it's already have good basic conditions and superiority. (3) Based on the systematic research on technical theory , method, practical experience and performance model of vegetables processing wastewater treatment and utilization, and analysis on the practical experience of local farms using vegetables processing wastewater to irrigate. It for the first time puts forward the idea that using the lotus pond wetland to purify and use vegetables processing wastewater, and tests it's possibility from theory, the theory, technology, economy , method and measures, and it gets that the idea is feasible.(4) This paper analyzes the source and features of the garlic processing wastewater, makes the feasible process flow of vegetables(garlic) processing wastewater treatment and utilization, identifies experiment content and purpose, fixes the actual experiment crop cultivation technique, production management measures, and other production management conditions, divides the experimental area, designs the contrast experiments and puts forward the necessary experimental observation and methods.The results of the experiment indacated that: (1) the wastewater of garlic processing are mainly produced during peeling garlic skins ,rinsing the peeled garlic, dehydrating the slices, and rinsing the workshop.It's kind of organic wastewater, contents higher level of organic matter and nutrient, whth almost none toxic substance or heavy metal material. (2)the wastewater of garlic processing contains higher concentrations of COD, if were discharged into the environment,it will cause environment pollution. Also it was harmful to lotus root by uesing biological purification in wetland directly, so, to achieve certain ecological effect, the wastewater must be disposed, then it can be uesed in the wetland.(3) the pretreatment facilities of this experiment, was invested small, handled easily, with yield faster results, the wastewater was preliminary and effectively purified for the lotus pond, laid groundwork for further biological purify using.(4)the lotus wetland can efficient get rid of organic pollutants,such as COD,BOD,SS.The function of absorpting NH3-N was effectivity, PH value was stable.(5)When wastewater infuse into wetland, nutrient component such as N,P,K and organic matter content was increased, improving the lotus pond sediment fertility.The content of metallic elements in the lotus pond sediment,such as effectively copper, zinc, iron, manganese, boron and the whole boron, zinc, lead, cadmium,was scarcely changed.It proved that using garlic processing wastewater to irrigate lotus will not cause heavy metal pollution.(6)The pretreatmented garlic processing wastewater was innocent to lotus root, lotus root that irrigated by wastewater were growing more luxuriantly. During the whole growth period no insect damage happened. It proved that wastewater content more nutrients and organic matter, was not only benefit to the growth of the lotus, also uesful for the pest control.(7)Irrigating the wetland with right amout of wastewater of garlic processing, can increase the yield, the nutritional value also achieve a good level. and the no harmful heavy metal was checked out, so it's safe to consumption. (8) Purifing garlic processing wastewater by using the lotus pond, can improve soil structure and composition, improve soil fertility, beneficial to the growth of vegetation, prevent soil erosion, improve the eco-environment,and maintain ecological balance. 9when purifing garlic processing wastewater by using the lotus pond, the right amount of wastewater must be irrigated at right time.(5)In this paper benefits of purifing garlic processing wastewater was analysed and calculated, the results showed that economic benefits was notable ,and the indirect economic benefit,the social effect and environmental benefits was considerable.(6)based on sufficient research and argument and according to the requirements of the development of the society, also,combining the actual situation of the Bahu Town, this paper has put forward technology mode of wastewater resourcesing and water resource recycling ,aimed to develope ecocycle economy.In conclusion, this research widened the field of constructed wetland purifying wastewater, and this research make further efforts on the mechanism of action about high density wastewater treatment, scientifically practiced on wastewater and rural environment for agricultural product processing enterprise (especially those small ones scattered in the rural).Also, this researchi provide scientific basis for decision-making for Bahu Town in wastewater reuse and the ecological towns construction.
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