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- W2468522079 abstract "Precipitation was integrated with hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membrane process for the removal of manganese and ammonia in electrolytic manganese wastewater. Different precipitants, including NaOH, poly aluminum chloride, polyacrylatnide and NH(4)HCO(3), were added into wastewater and reacted with manganese to form precipitation for manganese removal. It was found that NH(4)HCO(3) showed the highest manganese removal efficiency (up to 98.8%) compared with the other three precipitants. The concentration of manganese decreased from 15420 to 182.5 mg/L when the dosage of NH(4)HCO(3) was 12 g/L and the settling time was 2 h. In addition, the formed MnCO(3) is an important industrial material. Subsequent membrane process provided a hydrophobic barrier for residual manganese and a stripping channel for ammonia. Ammonia diffused through membrane pores to the stripping solution containing sulfuric acid. Such hydrophobic PVDF membrane process enabled 99.9% removal of ammonia. During a long-term performance of membrane process, ammonia decreased sharply and stabilized at about 203 mg/L, with the removal efficiency of 99.4%. Acceleration caused by ammonia stripping to the permeate flux was found; however, it may disappear accompanied with the reduction of ammonia. Membrane fouling caused by manganese and magnesium was also found and led to a permeate flux decline. Manganese was not detected during the whole performance, showing that PVDF exhibited a good hydrophobicity and stability." @default.
- W2468522079 created "2016-07-22" @default.
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- W2468522079 date "2011-01-01" @default.
- W2468522079 modified "2023-09-24" @default.
- W2468522079 title "TREATMENT OF ELECTROLYTIC MANGANESE WASTEWATER BY PRECIPITATION AND HYDROPHOBIC HOLLOW FIBER MEMBRANE PROCESS" @default.
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