An odorous eliminator consists of the three systems： Firstly, an oxidation system by ozone gas obtained from an ozone generator, type corona discharge was used as an oxidizing agent. This gas has got enough concentra...An odorous eliminator consists of the three systems： Firstly, an oxidation system by ozone gas obtained from an ozone generator, type corona discharge was used as an oxidizing agent. This gas has got enough concentration to eliminate malodor and poisonous gas especially H2S. Alternatively, the excess concentration of ozone gas could be used for disinfection into an oxidized bag; Secondly, the odorous was trap and disinfection system by acid or base and water for disinfection air pollution from incomplete oxidation before transfer to an adsorption system; Finally, the adsorption system which is contained high efficiency activated carbon was used as an adsorbent. This research was undertaken to study the method of improving the adsorption capacity of coconut shell-based activated carbon for H2S by surface oxidation and metal addition techniques. The carbon sample treated with 6.0 M HNOs and Zn impregnation gave the highest adsorption capacity for H2S, with increased adsorption efficiency of 230% over that of the untreated sample at 45 ℃. The maximum increase of 180% adsorption efficiency over that of untreated sample was observed for the O3 oxidized sample impregnated with Zn.展开更多
In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditio...In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditions on the phenol removal rate were investigated. The test results showed that when the phenol concentration was 0.1 g/L, the ozone-containing air flow rate was 0.05 m3/b, the ozone concentration was 3.58 mg/L, the pH value was 7.5, and the treating time was 30 minutes, the phenol removal rate reached 99%, with the COD removal rate equating to 55%. The property of treated wastewater could comply with the first-grade effluent specified in ＂Comprehensive Wastewater Discharge Standard＂ （GB8978--1996）.展开更多
Orthogonal method was adopted to optimize the preozonation process and to minimize the bromate formation. Factors such as contact time, pH and ammonia concentration were investigated by orthogonal experiments to under...Orthogonal method was adopted to optimize the preozonation process and to minimize the bromate formation. Factors such as contact time, pH and ammonia concentration were investigated by orthogonal experiments to understand the interaction of various operation conditions on the formation of bromate and other disinfection byproducts(DBPs). Results showed that pH had the most significant influence on the minimization of bromate formation. The factors influencing the formation of bromate were in order of pH > contact time > ammonia concentration. For the formation of trihalomethanes(THMs) and haloacetic acids(HAAs), however, contact time significantly influenced their formation potential. In the practical preozonation process of waterworks, it is appropriate to set preozonation contact time to be 20 min. In order to minimize the formation of bromate, pH value of the raw water should be adjusted to 6. 0, and a certain concentration of ammonia could be added into the water to strengthen the minimization effect when the concentration of bromide in the raw water is higher than that in the experimental water.展开更多
文摘An odorous eliminator consists of the three systems： Firstly, an oxidation system by ozone gas obtained from an ozone generator, type corona discharge was used as an oxidizing agent. This gas has got enough concentration to eliminate malodor and poisonous gas especially H2S. Alternatively, the excess concentration of ozone gas could be used for disinfection into an oxidized bag; Secondly, the odorous was trap and disinfection system by acid or base and water for disinfection air pollution from incomplete oxidation before transfer to an adsorption system; Finally, the adsorption system which is contained high efficiency activated carbon was used as an adsorbent. This research was undertaken to study the method of improving the adsorption capacity of coconut shell-based activated carbon for H2S by surface oxidation and metal addition techniques. The carbon sample treated with 6.0 M HNOs and Zn impregnation gave the highest adsorption capacity for H2S, with increased adsorption efficiency of 230% over that of the untreated sample at 45 ℃. The maximum increase of 180% adsorption efficiency over that of untreated sample was observed for the O3 oxidized sample impregnated with Zn.
文摘In this study, the O3/BAC/TiO2 catalytic method was used to treat the phenolic wastewater. During the experiments the effects of initial phenol concentration, ozone concentration, pH value, catalyst and other conditions on the phenol removal rate were investigated. The test results showed that when the phenol concentration was 0.1 g/L, the ozone-containing air flow rate was 0.05 m3/b, the ozone concentration was 3.58 mg/L, the pH value was 7.5, and the treating time was 30 minutes, the phenol removal rate reached 99%, with the COD removal rate equating to 55%. The property of treated wastewater could comply with the first-grade effluent specified in ＂Comprehensive Wastewater Discharge Standard＂ （GB8978--1996）.
基金Supported by the National Natural Science Foundation of China(No.51008162)Natural Science Foundation of Tianjin(No.10JCYBJC03500)
文摘Orthogonal method was adopted to optimize the preozonation process and to minimize the bromate formation. Factors such as contact time, pH and ammonia concentration were investigated by orthogonal experiments to understand the interaction of various operation conditions on the formation of bromate and other disinfection byproducts(DBPs). Results showed that pH had the most significant influence on the minimization of bromate formation. The factors influencing the formation of bromate were in order of pH > contact time > ammonia concentration. For the formation of trihalomethanes(THMs) and haloacetic acids(HAAs), however, contact time significantly influenced their formation potential. In the practical preozonation process of waterworks, it is appropriate to set preozonation contact time to be 20 min. In order to minimize the formation of bromate, pH value of the raw water should be adjusted to 6. 0, and a certain concentration of ammonia could be added into the water to strengthen the minimization effect when the concentration of bromide in the raw water is higher than that in the experimental water.
