Department of Chemical and Biochemical Sciences, Mohammed VI Polytechnic University, Benguerir, Morocco E-mail:
Water Sci Technol. 2020 Jan;81(2):199-209. doi: 10.2166/wst.2020.071.
Sterile phosphate (SP) was investigated for phosphorus removal from wastewater using batch adsorption experiments. The novel adsorbent is a mining by-product obtained from the phosphate mining plants having a strong affinity with phosphorus ions present in wastewater. The results of the batch adsorption experiments indicated that 30 min of contact time between the adsorbent and wastewater was sufficient for attaining equilibrium. The phosphorus removal from wastewater increased with increasing initial phosphorus concentration, adsorbent dose and temperature, while it decreased with increasing initial pH values. The maximum phosphorus removal efficiency was noted to be 94.4%. It was achieved in slightly acidic conditions (pH = 4), with an adsorbent dose and initial phosphorus concentration of 3 g L and 20 mg L, respectively, and at room temperature. Kinetic analysis showed that phosphorus adsorption onto sterile phosphate was best fitted with the pseudo-second order kinetic model. The adsorption equilibrium data fitted well to the Langmuir model equation, indicating monolayer coverage of the adsorbent. The adsorption capacity calculated from the Langmuir model equation was found to be 7.962 mg g. Comparing with some industrial products and natural mineral adsorbents, sterile phosphate was found to be the most efficient adsorbent for phosphorus removal from wastewater.
采用批式吸附实验研究了无菌磷酸盐（SP）从废水中去除磷。这种新型吸附剂是一种从磷矿开采厂获得的矿业副产品，对废水中存在的磷离子具有很强的亲和力。批式吸附实验结果表明，吸附剂与废水接触 30 分钟即可达到平衡。废水中磷的去除率随初始磷浓度、吸附剂用量和温度的增加而增加，而随初始 pH 值的增加而降低。最大磷去除效率为 94.4%。在略微酸性条件（pH=4）下，吸附剂用量和初始磷浓度分别为 3 g/L 和 20 mg/L，在室温下达到。动力学分析表明，磷在无菌磷酸盐上的吸附最符合准二级动力学模型。吸附平衡数据很好地符合朗缪尔模型方程，表明吸附剂的单层覆盖。从朗缪尔模型方程计算得到的吸附容量为 7.962mg/g。与一些工业产品和天然矿物吸附剂相比，无菌磷酸盐被发现是从废水中去除磷的最有效吸附剂。
