Study On The Biodegradation Characteristics Of Nitrobenzzene In Weihe Water Sample And The Medium

The Weihe River,one of the main tributaries of the Yellow River, accounts for 18% of the water resources in Shaanxi Province. However, it has accepted 80% of the industrial wastewater and domestic sewage of the whole province. In recent years, along the Weihe River water quality due to industrial and mining enterprises increased rapidly increasing urban population, a large number of domestic wastewater and industrial wastewater discharged into, making the Weihe River pollution concern. In order to understand the organic pollutiong of the Weihe water sample and its medium biodegration of organic pollutants,the experimetation based on nitrobenzene as the typical organic pollutants,and studied on the biodegration of nitrobenzene in Weihe water sample and the medium.The three main simulation experiments take silt, river sand, sediment samples one meter from the river channel, and flood plain sand as the media for biodegradation experiments in the water sample to study the best conditions and regular patterns of the biodegradation of low-concentration nitrobenzene.The results show that:(1) whether there exists medium or not, biodegradation of nitrobenzene is applicable to Monod equation;(2) In terms of the maximum consumption rate of biological degradation under different conditions, there is silt> river sand> sediment samples one meter from the river channel> floodplain sand;(3) In both sterile and non-sterile conditions, the rank according to the maximum consumption rate is fine sand>medium sand> coarse sand; (4) Under conditions of 7 in pH value and 14℃, the maximum consumption rate of nitrobenzene reaches a maximum of 0.6243, thus it can be concluded that it is the best degradation conditions; While alkaline conditions inhibit microbial growth;(5) in 14℃,pH=9 conditions,in the medium nitrobenzene cannot completely degration,so we can see inhibit microbial growth in alkalion condition;(6) Under the change of nitrobenzene concentration the maximum consumption rate changed significantly;(7) Non-sterile medium enables nitrobenzene to degrade completely in the period of degradation under the best biodegradation conditions. And the maximum consumption rate of the nitrobenzene solution with non-sterile media is greater than that of the nitrobenzene solution with sterile medium;(8) The maximum consumption rate under the conditions of medium is greater than that without media.