为解决湖北某厂以偶氮染料为主的碱性印染废水可生化性差、色度高、COD高等问题,采用絮凝、Fenton试剂和臭氧氧化的预处理方法对其进行处理,比较了3种方法的处理效果。结果表明:3种方法中,臭氧氧化预处理效果最好,但处理成本太高;硫酸...为解决湖北某厂以偶氮染料为主的碱性印染废水可生化性差、色度高、COD高等问题,采用絮凝、Fenton试剂和臭氧氧化的预处理方法对其进行处理,比较了3种方法的处理效果。结果表明:3种方法中,臭氧氧化预处理效果最好,但处理成本太高;硫酸亚铁和聚合硫酸铁复合使用时,于100 mL印染废水中投加0.05 g硫酸亚铁和1.00 mL 8%聚合硫酸铁,COD去除率达49.35%,色度去除率为87.50%,B/C升高至0.34,效果次之;Fenton试剂预处理,效果最差。综合考虑,适合此废水的预处理方法为硫酸亚铁和聚合硫酸铁复合使用的絮凝法。展开更多
For the recovery of arsenic in waste acid water produced in copper smelting,a two-stage operation was investigated,in which arsenic from waste acid water was first precipitated by ferrous sulfide,then lime was used to...For the recovery of arsenic in waste acid water produced in copper smelting,a two-stage operation was investigated,in which arsenic from waste acid water was first precipitated by ferrous sulfide,then lime was used to adjust the pH,and arsenic was removed further.The experiment showed that the parameters including dosage of material,pH of solution,reaction and aeration time affected the efficiency of arsenic removal.The experimental results indicated that the first stage required 3 h for the precipitation by ferrous sulfide at room temperature,the second stage required 30 min for aeration,and the best dosage of ferrous sulfide was two times of the calculated molar quantity.In this condition,after the two-stage treatment,the arsenic concentration in waste acid water was reduced from 6240 mg·L-1 to 0.5 mg·L-1.The average removal rate of arsenic from waste acid water was more than 99.9%,and the content of arsenic in the sludge was above 15%.展开更多
A new method of recovery of phosphorus from high concentration phosphorous-containing pharmaceutical industry wastewater with composite calcium was proposed.It was found that the efficiency of phosphorous removal from...A new method of recovery of phosphorus from high concentration phosphorous-containing pharmaceutical industry wastewater with composite calcium was proposed.It was found that the efficiency of phosphorous removal from the wastewater was affected by dosage of composite calcium,pH of solution,and the mole ratio of calcium chloride and calcium oxide in the composite calcium.The production of phosphorus residue,the available phosphorus(calculated as P2O5)and N,N-dimethylformaide(DMF)in the phosphorus residue were also determined.The content of phosphorus in the wastewater could be reduced from 31000 mg·L-1 to less than 0.5 mg·L-1,and the content of the available phosphorus in the phosphorous residue was about 18%,approaching the national standard for superior grade product of phosphorus fertilizer.Furthermore,the poisonous material DMF was not detectable in the residue by GC-MS and spectra photometry.展开更多
文摘为解决湖北某厂以偶氮染料为主的碱性印染废水可生化性差、色度高、COD高等问题,采用絮凝、Fenton试剂和臭氧氧化的预处理方法对其进行处理,比较了3种方法的处理效果。结果表明:3种方法中,臭氧氧化预处理效果最好,但处理成本太高;硫酸亚铁和聚合硫酸铁复合使用时,于100 mL印染废水中投加0.05 g硫酸亚铁和1.00 mL 8%聚合硫酸铁,COD去除率达49.35%,色度去除率为87.50%,B/C升高至0.34,效果次之;Fenton试剂预处理,效果最差。综合考虑,适合此废水的预处理方法为硫酸亚铁和聚合硫酸铁复合使用的絮凝法。
文摘For the recovery of arsenic in waste acid water produced in copper smelting,a two-stage operation was investigated,in which arsenic from waste acid water was first precipitated by ferrous sulfide,then lime was used to adjust the pH,and arsenic was removed further.The experiment showed that the parameters including dosage of material,pH of solution,reaction and aeration time affected the efficiency of arsenic removal.The experimental results indicated that the first stage required 3 h for the precipitation by ferrous sulfide at room temperature,the second stage required 30 min for aeration,and the best dosage of ferrous sulfide was two times of the calculated molar quantity.In this condition,after the two-stage treatment,the arsenic concentration in waste acid water was reduced from 6240 mg·L-1 to 0.5 mg·L-1.The average removal rate of arsenic from waste acid water was more than 99.9%,and the content of arsenic in the sludge was above 15%.
文摘A new method of recovery of phosphorus from high concentration phosphorous-containing pharmaceutical industry wastewater with composite calcium was proposed.It was found that the efficiency of phosphorous removal from the wastewater was affected by dosage of composite calcium,pH of solution,and the mole ratio of calcium chloride and calcium oxide in the composite calcium.The production of phosphorus residue,the available phosphorus(calculated as P2O5)and N,N-dimethylformaide(DMF)in the phosphorus residue were also determined.The content of phosphorus in the wastewater could be reduced from 31000 mg·L-1 to less than 0.5 mg·L-1,and the content of the available phosphorus in the phosphorous residue was about 18%,approaching the national standard for superior grade product of phosphorus fertilizer.Furthermore,the poisonous material DMF was not detectable in the residue by GC-MS and spectra photometry.
