摘要
为了研究氢氧化镁对磷的吸附能力,考查了氢氧化镁用量,吸附时间,废水初始pH以及温度等因素对磷的去除率的影响,同时测定了氢氧化镁吸附磷时的吸附等温线.结果表明,氢氧化镁吸附磷符合Langmuir模型,并得出了其Langmuir吸附等温方程,属于典型的单分子层吸附;氢氧化镁处理含磷4 mg/L的废水时,氢氧化镁的最佳投入量为0.6 g/L,反应时间仅为5 min,可使得磷的去除率达到95%以上;温度对磷去除率的影响并不明显,可在室温下进行;且实验表明氢氧化镁具有较强的缓冲能力,此吸附可在较宽pH范围内进行;处理含磷废水后的氢氧化镁可循环使用.
The influence of dosage of magnesium hydroxide,adsorption time,initial pH value of wastewater and reaction temperature on phosphorus removal was researched,and the adsorption isotherm also was determined,in order to study the adsorption capacity of magnesium hydroxide on phosphorus.The results showed that adsorption behavior of magnesium hydroxide on the phosphorus was well fitted with the Langmuir model,the adsorption process was a typical single molecular layer adsorption.And the Langmuir adsorption isotherm equation was calculated.When the concentration of initial phosphorus-containing wastewater was 0.004 mg/mL,the dosage of magnesium hydroxide was 0.6 g/L,the reaction time was about just 5 minutes,the phosphorus removal could reach over 95%.The reaction can be occurred at room temperature,and effect of temperature on the phosphorus removal is weak,in addition,experiments show that magnesium hydroxide has strong buffering capacity,the adsorption could occurred in a wide pH range,magnesium hydroxide could be reused after that phosphorus-containing wastewater was purified.
出处
《武汉工程大学学报》
CAS
2012年第8期19-23,共5页
Journal of Wuhan Institute of Technology
关键词
氢氧化镁
含磷废水
去除率
吸附
magnesium hydroxide； phosphoretted waste water； removal rate； adsorption
