Study On Degradation Of Nonylphenol Ethoxylates By Actived Sludge Process

Nonylphenol Ethoxylates are accomplished by Nonyl Phenol and Ethylene Oxide. Surface activity mainly comes from the sparse ability in swimming in nonylphenol and hydrophily of an Repeating element in Second oxygen base on contrapuntal go ahead replacing long-chain. Because it has some stability characteristics such as Acid proof alkali, Applied to industry broadly such as Spinning and weaving, Spinning and weaving, making plastic and paper, and agriculture and daily life such as clearing melt articles using family. After entering the wave environment, it may dislodge second oxygen base part loving water after living things degradation, and form centre supersession outcome. Compared with mother's body compound, Nonylphenol have property characteristics such as difficult degradation, the sparse ability in swimming, The grease dissolves nature and bioaccumulation. It shows estrogen activity to the living things body,the grease dissolves nature, was of Endocrine Disrupting Chemicals,EDCs.In the experiment, A/O process is considered. It works under optimal conditions. And micro-biological degradation of NPnEO by A/O process is evaluated. In the same time, NPnEO degradation flora is cultured and analysed. The experimental results show that the state of activated sludge will be affected with increase of NPnEO in raw water. But with the adaption of activated sludge, the state will gradually be improved and indicators of the state of activated sludge will be more stable. When the density of NPnEO becomes higher, various indicators of water quality will also be impacted. Removal rate of COD and TN will drop. With the concentration of NPnEO being stable, removal rate of COD will rebound and removal rate of TN will also be stable. Removal of NPnEO by A/O process is obvious after a short-term acclimation. But change of concentration of NPnEO will lead to substantial change of removal rate. During the course, ultimate micro-biological degradation of NPnEO will happen and the structure of benzene ring will be destroyed. Both ultimate micro-biological degradation and adsorption of activated sludge lead to satisfying removal rate.In this study, modern molecular biology techniques are used such as PCR and DGGE to analysis structural changes of microbial flora in the process. It is found that with concentration changes of NPnEO in raw water structure of microbial flora will change too. The number of bands in DGGE will decrease. Dice coefficient of both of the two pools will be smaller. However, with the stability of concentration of NPnEO, dice coefficient of the two pools will increase. The structure of microbial flora will be relatively stable. And ultimately we get the microbial flora that adapt for degradation of NPnEO and its intermediate products.