Immobilization of Zinc oxide (ZnO) nanoparticle for simultaneous photocatalyic and biological treatmment of organic pollutant to degrade phenol organic compound in wastewater

Abstract

Phenol is one of the most common toxic environmental pollutants that originate mainly from industrial processes. It is a recalcitrant and hazardous compound, which is toxic at relatively low concentration and hence, USEPA has set a limit of 0.1mg/L of phenol as the permissible limit in the water bodies. It must be removed from the environment. The combine treatment methods for the treatment of phenol contaminated wastewater are more effective and less costly. The use of microbial and photocatalytic in the purpose has advanced significantly during the past three decades and it has been found that large numbers of microbes coexist in almost all natural environments, particularly in wastewater. Most of the studies were done on the water treatment is were to characterize phenol, to investigate the effect of operating parameter such as initial concentration of phenol, aeration, immobilization ZnO onto substance, and to study of effectiveness of combine of photocatalytic and biological treatment to degrade different phenol. This study in condition of under UV light irradiation within six hours of reaction time. In addition find the alternative substance to calcinate ZnO into the sponge make it immobilize to degrade different phenol concentration. The results show that the photocatalytic degradation by zinc oxide and UV light show high removal efficiency of increasing phenol. For 10mg/l shows removal efficiency about 83.12%, 79.32%, 74.66%, and 64.96% respectively from 1st until 4th cycle. While for 20mg/l show removal efficiency about 87.51%, 84.72%, 77.55%, and 71.26% respectively. Furthermore, combine photocatalytic with biological treatment which using microbial to degrade phenol in synthetic wastewater also show high efficiency. The presence 50mg/l show high removal of phenol which is 89%, 92% 93%, and 95% respectively. Based on this study, it proved combine treatment can degrade well phenol in wastewater.