Coagulation/flocculation process in the treatment of abattoir wastewater
Coagulation/flocculation process in the treatment of abattoir wastewater
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DOI：
10.1016/j.desal.2005.10.039
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发表时间：
2006-09-05
期刊：
影响因子：
9.9
通讯作者：
Alade, A.
中科院分区：
文献类型：
--
作者：
Amuda, O. S.;Alade, A.
采用混凝-絮凝工艺对屠宰废水中的化学需氧量（COD）、总悬浮物（TSS）和总磷（TP）进行了实验室规模的去除研究。废水被允许沉降24小时，TSS和TP的去除率分别达到65%和32%。在混凝过程中使用明矾、氯化铁和硫酸铁。明矾被证明更有效地减少TSS和TP存在于废水中，而硫酸铁是更有效地减少COD。当明矾投加量增加到750 mg/l时，TP的去除率可达45%。TP的去除率随明矾剂量的增加而线性增加，导致在1000 mg/l明矾剂量下TP的去除效率为98%。在95%的置信区间内，明矾投加量、混凝速度梯度/快速混合时间（混凝Gt）和絮凝速度梯度/慢速混合时间（絮凝Gt）对TSS去除率无显著影响，但明矾投加量对TP去除率有显著影响。在无机混凝剂中加入絮凝剂，可有效降低COD、TSS和TP，减少混凝剂用量，降低混凝/絮凝工艺成本。通过使用明矾，产生了显著程度的颗粒尺寸消除;这在添加明矾后进一步改善。
The coagulation/flocculation process was used at laboratory bench scale for the removal of chemical oxygen demand (COD), total suspended solids (TSS) and total phosphorus (TP) in abattoir wastewater. The wastewater was allowed to settle for 24 h and TSS and TP removal efficiencies of 65% and 32% were achieved, respectively. Alum, ferric chloride and ferric sulfate were employed during the coagulation/flocculation process. Alum proved more effective in the reduction of TSS and TP present in the wastewater, whereas ferric sulfate was more effective in the reduction of COD. Increasing the dose of alum to 750 mg/l caused the removal efficiency of TP to reach 45%. The rate of removal of TP linearly increased with increasing doses of alum, resulting in a 98% removal efficiency of TP at 1000 mg/l dose of alum. At a 95% confidence interval, alum dose, coagulation velocity gradient/rapid mixing time (coagulation Gt) and flocculation velocity gradient/slow mixing time (flocculation Gt) were not significant for TSS removal efficiency, but alum dose was significant for TP removal. The addition of a polyelectrolyte to an inorganic coagulant proved effective in the reduction of COD, TSS and TP, cut the amount of coagulant used and reduced the cost of the coagulation/flocculation process. A significant degree of particle elimination by size was produced by using alum; this improved further with the addition the polyelectrolyte.