Faculty of Engineering and Technology (Civil Engineering), R.S.T.M Nagpur University, Nagpur Maharashtra, India.
Water Sci Technol. 2010;61(2):463-72. doi: 10.2166/wst.2010.831.
This article discusses a combined treatment system comprising electrocoagulation (EC) as a pre-treatment followed by anaerobic fixed film fixed bed reactor (AFFBR) for treatment of high strength pharmaceutical wastewater. The effect of various operating parameters such as pH, current density and electrolysis duration on COD, BOD and colour removal was studied. The maximum removals for COD, BOD and colour under optimal operating conditions i.e. pH 7.2, current density (CD) of 80 A/m(2) and electrolysis time of 25 minutes were 24%, 35% and 70.25% respectively. Increase in current density has resulted in decrease in electrolysis duration with marginal improvement in treatment efficiency. The efficiency of removal is discussed in terms of kg COD(r) A(-1)m(-2)h(-1) and energy consumption as Wh kg(-1)COD(r). The effluents obtained after EC were treated by AFFBR at various organic loading rates (OLRs) and hydraulic retention times (HRTs). The results indicated removals in the range of 80-90% for COD and 86-94% for BOD respectively, at OLRs between 0.6 to 4.0 Kg COD/m(3) d at an HRT of 2 days. The total gas quantity increased with increase in both HRT and OLR up to a loading of 6 Kg COD/m(3)/d but it did not commensurate with organic load. The results indicated that the combined treatment option is competitive and can be used effectively for high strength wastewaters.
本文讨论了一种组合处理系统，该系统包括电凝聚 (EC) 作为预处理，然后是厌氧固定膜固定床反应器 (AFFBR) 用于处理高强度制药废水。研究了各种操作参数（如 pH 值、电流密度和电解时间）对 COD、BOD 和色度去除的影响。在最佳操作条件下（即 pH 值为 7.2、电流密度为 80 A/m²和电解时间为 25 分钟），COD、BOD 和色度的最大去除率分别为 24%、35%和 70.25%。增加电流密度会导致电解时间减少，处理效率略有提高。去除效率以 kg COD(r) A(-1)m(-2)h(-1)和 Wh kg(-1)COD(r) 为单位进行讨论。将 EC 后的废水在不同的有机负荷率 (OLR) 和水力停留时间 (HRT) 下用 AFFBR 进行处理。结果表明，在 OLR 为 0.6 至 4.0 Kg COD/m(3) d、HRT 为 2 天时，COD 和 BOD 的去除率分别在 80-90%和 86-94%之间。随着 HRT 和 OLR 的增加，总气量增加，但与有机负荷不成比例。结果表明，组合处理方案具有竞争力，可有效用于处理高强度废水。
