Research On Photo-Fenton And Miobiological Treatment Coupling For Nitrobenzene Removal From Water

Nitrobenzene compounds,a highly toxic compound,is very difficult to be degraded and its chemistry property is very stabilizing. Many countries have ranked this kind of waste water as the first restraining contaminant .The treatment of nitrobenzene compounds contaminated water causes great environmental concern. In this work,The coupling of photo-Fenton (chemical) and biological treatments has been used for the removal of nitrobenzene compounds from water. The chemical reaction was employed as a pre-treatment step for the conversion of the toxic and non-biodegradable nitrobenzene into biodegradable intermediates that were subsequently removed by means of biological treatments.The Major Research Paper including nitrobenzene wastewater treatment by photo-Fenton Process :it was in order to understand the effect rule which were begotten by initiative pH value,H₂O₂ andFe²⁺ concentration; Biodegradability of the treated solutions was investigated. Rhodococcus erythropolis and Pseudomonas for the main study, carried out by the growth conditions and the conditions of degradation of nitrobenzene. In optimal conditions,The coupling of photo-Fenton and biological treatments degraded nitrobenzene. The conclusions were as follows:1. The optimal operating conditions of photo-Fenton determined in the Concentration of nitrobenzene 200mg/L under are as following: the initial concentrations of 200 mg/L for H₂O₂ and 30 mg/L for Fe²⁺,and 30 min at pH =3.In optimal conditions,Nitrobenzene degradation efficiency can be achieved 50%.2. Experimental results showed a considerable increase in treated solution biodegradability. BOD5/COD was increased from 0.05 for untreated solution up to 0.463 at the point were all NB was eliminated from the solution,3. The most suitable degradation condition is:temperature is 30℃,the shaking rate of the culture flasks is 130 r/min,initial pH is 8.0, the concentration of NaCl is 0.5%,The degradation rate of petroleum by single strain is more than 60%4. The combined photo-Fenton and biological process can remove 50% nitrobenzene from water when this is treated with [Fe²⁺] =30 mg/L and [H₂O₂] = 202 mg/L during 30 min of UV irradiation. After this, complete removal has been achieved in 24 h of biological treatments .