Treatment Of Typical PPCPs In Biological Electrode Method

Pharmaceuticals and personal care products PPCPs are widely used in human lives, but the vast majority of PPCPs can not fully be used or absorbed. As sewage treatment plants can not treatment these substances, which are hard to ecological environment and human healthy by a large number of PPCPs into the environmentBiological treatment and biological-electrode treatment are used to remove typical PPCPs. Results show that the biological treatment is not effect to remove diclofenac; the ibuprofen removal efficiency by the biological treatment can reach more than 30%. In the same water quality conditions, biofilm treatment is more efficient than activated sludge treatment to remove the typical PPCPs; biofilm electrode treatment is more efficient than activated sludge-electrode treatment. Biological-electrode treatment method, can significantly improve the removal efficiency of diclofenac and ibuprofen; diclofenac removal efficiency is increased by more than 50%; ibuprofen removal efficiency is increased by more than 20%. Considering influent loading, current intensity, concentration, reaction period, pH and ionic strength,the best operation conditions of removing the typical PPCPs in biological method are:influent loading of 1.5 kg·(m3·d)-1,2 cycles a day, PPCPs concentration of 1.0 mg·L-1,pH 7 and ionic strength of 0.01 mol·L-1. The best operation conditions of removing the typical PPCPs in biological-electrode method are:influent loading of 1.5 kg·(m3·d)-1, current intensity of 10mA, 3 cycles a day, PPCPs concentration of 1 mg·L-1, pH 7 and ionic strength of 0.01 mol·L-1.Degradation dynamic models of typical PPCPs in biological method and biological-electrode method have been built in this research. Biological method removing diclofenac is an adsorptive reaction that conforms to the pseudo-second order kinetic. Biological method to remove ibuprofen is a biodegradation that conforms to the first-order kinetic. Degradation of diclofenac and ibuprofen conforms to the first-order kinetic by biological-electrode method.