The Study On The Treatment Of Ammonia Chloride Wastewater By The Small-scale Constructed Wetland Installation

With the development of industry in china, the influence to the environment that caused by the industrial wastewater with ammonium-chloride is more and more severe, the large amount of the discharge of ammonia-nitrogen and chlorine ion will do harm to the environment. If the concentration of ammonia-nitrogen is too high, it will cause the entrophication of the waters and do harm to the health of human being to some degree, the large amount of chlorine ion will also change the structure to the soil and do damages to the crops and underground buildings. However, to study the economical and efficient technology of dealing with the high strength ammonium-chloride industrial wastewater is much of important in reality.The author introduced the concept, classification, the decontaminate mechanism and the development statement and trend of constructed wetland in this paper, Meantime, overviewed the annual amount, proprieties of chemical and physical, the treatment technology of ammonia-chlorine wastewater. Bese on the treatment technology actuality of ammonium chloride wastewater and the economical environment constructed wetland, the author bring forward using the constructed wetland to treat the ammonia-chlorine wastewater, Going about how to constructed the wetlands,including substrate, plants and the size. In this thesis, the author choice two substrates of zeolite and cobble , two plants of cattail and canna as the metarials to construct the four research systems, they are the zeolite-cattail system(1 system), the cobble-cattail system(2 system), the cobble-cannna system (3 system)and the no-plants cobble system(4 system).This paper research object is three concentration of ammonium chloride wastewater, i.e low, mid and high-concentration phase, testing all of index in the three stage, including COD,TN,NH₃-N and Cl^-, the goal aimed to the best inlet concentration and the relation between COD,TN,NH₃-N,Cl^- and hydraulic retention time, receiving removal ratio of index and the removal mechanism. The result of this paper is the removal ratio in three of four research systems are attaining to 50% and above on. The experimental results is that 1 system's removal ratio is the best, 2 and 3 system's are the middle, the last is the 4, so the constructed wetlands is sensibility.To the chlorine ion removing, the author is also using three concentration of ammonium chloride to go about the best inlet concentration and the facts how to affect the removal ratio, including PH and temperature. From the result of the research, in the 1 and 2 systems, the removal efficiency in the low-concentration phase is the highest, and the high, mid-concentration phase is following, but in the third and fourth system the low-concentration phase is the lowest, and the mid-concentration phase, the high-concentration phase. When the pH value is 9.15, the chlorine removal ratio is the best while other facts are same. The same fact is the best temperature is 31℃if receiving the highest removal efficiency.