Optimization of process conditions for phosphorus removal using lanthanum calcium modified sludge/wheat straw hydrothermal carbon
The research focuses on the removal of phosphorus from municipal sludge,with potassium dihydrogen phosphate as the target pollutant.Multi-metal modified sludge/wheat straw hydrothermal char is prepared using alkali precipitation and one-step hydrothermal method.To obtain the optimal preparation conditions for high unit adsorption capacity,the effects of La/Ca molar ratio,sludge/wheat straw mass ratio,hydrothermal temperature,hydrothermal time,and solid-liquid ratio on unit adsorption capacity are studied.Based on single-factor experiments,response surface methodology is applied to optimize the conditions.The optimal hydrothermal temperature is determined to be 170℃,hydrothermal time 8.5 hours,and solid-liquid ratio 0.02.Under these conditions,the unit adsorption capacity of the biochar is 84.19 mg/g,which closely matches the predicted value of 82.21 mg/g.
municipal sludgehydrothermal carbonizationbiocharresponse surface methodologyphosphorus removal
NETL
NSTL
万方数据
