Study On The Treatment Of High Concentration Cephalosporin Swage From A Pharmaceutical Factory In ZIBO

Synthetic pharmaceutical wastewater, with high CODCr, high salt content and ammonia -nitrogen at high concentration, is very hard to be treated in the sewage disposal field. A pharmaceutical factory in Zibo, Shandong Province, the main products was cephalosporins intermediates, which produces 180 ton waste water per day and owns a sewage treatment plant which has a daily capacity of 500 ton. But after the treatment, the water quality cannot meet the discharge demand. Various water quality indexes (i.e. pH, CODCr) were used to figure out the problems existing in the treating process. Firstly, the four shares original sewages were treated respectively according to their characteristics to reduce the content of ammonia nitrogen and salt. Then Fenton-iron carbon micro electrolysis and Fenton-flocculation precipitation were applied to reducing CODCr content. At last, by comparing the efficiency and the cost, the new treating process was choosed and applied to solve the practical problems.For reducing the ammonia nitrogen, blow off method was adopted. Previous study revealed that pH, temperature and reaction time were the main factors controlling the reduce efficiency. To find out the most suitable experimental condition, a orthogonal experiment was designed and the results showed that 94.5% ammonia nitrogen was removed under the conditions of pH=12.0,35℃,120 min.The results of Fenton treatment showed that 39.75% of CODCr was reduced when pH=4.0,H2O2:Fe2+ ratio of 3:1,20mL/L of H2O2, reaction time for 60 min. Then, the Fenton-iron carbon micro-electrolysis method was applied to treating the swage, and 57.35% of CODCr was reduced under the conditions of pH=4.0, iron carbon ratio of 2:1, reaction time for 60 min.At last, the mixed swage in pre-adjusting tank was removed by Fenton-flocculation precipitation. The results showed that the removal rate of CODCr was reduced 52.19% under the optimum treatment condition (i.e., 10mL/L PAFC reacted for 25 min).Taking degradation performance and reagent cost in consideration, concluded that the Fenton-iron carbon micro-electrolysis method was superior to other methods. After Fenton-iron carbon micro-electrolysis treatment the BODs/CODCr of swage was increased form 0.17 to 0.42, which means the sewage could be more bio-available to microorganisms. And the sewage discharges achieve the standard of ’sewage discharged into urban sewer discharge standard’(CJ343-2010) after microorganism degradation. In addition, the sewage treatment facilities were analyzed in the safety risk and then corresponding emergency measures were made to minimize the safety risk.