uv fenton法处理高浓度印刷线路板油墨废水研究.docx

Abstract
Printed Circuit Board (PCB) ink wastewater with high COD concentration contains lots of positions, which is non-biodegradable, whose COD, metal ions (especially copper) and salty concentrations are extremely high. At present, there are rare methods to treat this wastewater, and this paper proposed and investigated the UV Fenton process to treat this water.
This paper investigated the effect of different UV sources on the degradation of CODcr in the wastewater and determined a high-intensity and high electro-optical conversion efficiency spherical UV lamp as the light source of the apparatus. Then, according to the light source, the reactor was designed and manufactured.
The optimal conditions for CODcr 9000mg/L wastewater are showing as below: H2O2 (30%) is 6%, Fe2+:H2O2 (molar ratio) at 1:200, initial temperature at 55℃,pH
at , treating 180min. Upon the optimal conditions, the CODcr can be reduced to lower than 100mg/L. Additionally, several different kinds of ink wastewater CODcr with initial ranging from 2500mg/L to 5000mg/L can be lower than 100mg/L. This method is suitable widely.
The research on the removal of copper shows: the lower CODcr in the outflow, the lower copper ion. Only when the outflow CODcr was lower than 200mg/L, the copper ion could reduce from 200mg/L to by adjusting the pH high than , fulfilling the electroplating industries’ wastewater discharging standard. Struvite (ammonium magnesium phosphate) and aeration stripping were investigated to remove ammonia from outflow, too. Aration stripping is better than the other, and ammonia can be reduced to 14mg/L from initial 540mg/L after 3 hours at pH and airflow 30L/min.
Good results can be achieved using the UV Fenton process to treat PCB ink
wastewater. Meanwhile, copper ion can be removed effectively. In addition, good results can be also achieved using the process to treat others ink wastewater. This method provides a new feasible and perspective path in the are