Zeolite-Mg/Fe chloride dual enhanced coagulation is a cost-effective method for advanced treatment of swine wastewater, but the sludge generated after the enhanced coagulation remains to be a problem. In this study, the precipitate from a swine wastewater coagulation unit was regenerated by pyrolysis treatment in an O₂-limited environment to develop a high efficient adsorbent (biochar-mineral composite, BMC) for the removal of Pb(II) from wastewater. SEM images indicate that complex Mg/Fe oxides and sludge biochar gathered around zeolite particles. Effects of different influencing factors such as Pb(II) initial concentration, pH, adsorption time and ion concentration on the adsorption performance were investigated. The results show that the Langmuir isotherm model can better express the adsorption of Pb(II) on BMC than Freundlich model and Temkin model. BMC pyrolyzed at 500 °C showed the maximum adsorption capacity of 450.58 mg/g under experimental condition of 25 °C, 100 mg/L Pb(II) initial concentration and the initial pH of 5.6. The adsorption mechanisms on BMC mainly include ion exchange, electrostatic interaction. Therefore, it is a cost-effective and environmental-friendly strategy to obtain biochar-mineral composite from recycled sludge, which can efficiently remove Pb(II) from wastewater.

沸石-Mg / Fe氯化物双重强化混凝法是一种用于猪场废水深度处理的经济有效的方法，但是强化混凝后产生的污泥仍然是一个问题。在这项研究中，来自猪废水凝结装置的沉淀物通过在O _2中进行热解处理而再生。在有限的环境中开发出一种高效的吸附剂（生物炭-矿物复合材料，BMC）以从废水中去除Pb（II）。SEM图像表明，复杂的Mg / Fe氧化物和污泥生物炭聚集在沸石颗粒周围。研究了Pb（II）初始浓度，pH，吸附时间和离子浓度等​​不同影响因素对吸附性能的影响。结果表明，Langmuir等温模型比Freundlich模型和Temkin模型能更好地表达Pb（II）在BMC上的吸附。在25°C，100 mg / L Pb（II）初始浓度和初始pH值为5.6的实验条件下，于500°C裂解的BMC的最大吸附容量为450.58 mg / g。BMC的吸附机理主要包括离子交换，静电相互作用。因此，