A tannin-based agent for coagulation and flocculation of municipal wastewater as a pretreatment for biofilm process
A tannin-based agent for coagulation and flocculation of municipal wastewater as a pretreatment for biofilm process
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DOI：
10.1016/j.jclepro.2018.02.044
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发表时间：
2018-05-01
影响因子：
11.1
通讯作者：
Suja, Fatihah
中科院分区：
文献类型：
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作者：
Hameed, Yasir Talib;Idris, Azni;Suja, Fatihah
在生物膜法中试装置上考察了单宁类混凝剂和絮凝剂(Tanflc)处理城市污水的效果。整个中试装置的流速分别为10、14和18 L/分钟，另外两个流量22和24 L/分钟仅用于絮凝和沉淀过程。絮凝效果没有明显恶化，即使在24 L/min的条件下，絮凝时间也只有7.5min。就澄清过程而言，强化效果非常好，特别是在高流量时。在没有丹皮絮凝剂的情况下，澄清池对浊度、总悬浮物、生化需氧量和总磷的去除效率分别低于20%、40%、22%和8%。同时，使用Tanflc时，对相同污染物的降解率分别为75%、61%、60%和16%。当使用Tanflc时，曝气池中的溶解氧水平显著增加(保证在曝气过程中节省能源)。例如，在没有使用丹氟酚的实验中测得的溶解氧水平为3毫克/L，当使用丹氟酚时，溶解氧水平上升到6毫克/L。此外，当使用Tanflc时，曝气池中的挥发性悬浮固体浓度降低(有望减少污泥的产生)。不加单氟的总悬浮物(mg/L)、化学需氧量(mg/L)和生化需氧量(mg/L)分别在12-36、60-104和24-50范围内。值得注意的是，Tanflc能够将这些测量降低到(9-26)、(28-68)和(7-24)的低水平。综上所述，研究结果表明，丹氟克是一种很有前途的生物处理单元澄清剂。鉴于这一改进，Tanflc可用于升级现有的处理厂或设计紧凑型处理单元。(C)2018爱思唯尔有限公司。保留所有权利。
The effects of a commercially produced Tannin-based coagulant and flocculant (Tanfloc) in a biofilm process pilot plant treating municipal wastewater were investigated. The investigated flow rates were 10, 14 and 18 L/min for the entire pilot plant, with two additional flows of 22 and 24 L/min were used for flocculation and sedimentation processes only. There was no clear deterioration in flocculation efficiency; even at 24 L/min, where the flocculation time was only 7.5 min. In terms of the clarification process, the enhancement was remarkably good; especially at high flows. Without Tanfloc, the removal efficiencies in the clarifier were less than 20%, 40%, 22% and 8% for turbidity, total suspended solids, biochemical oxygen demand and total phosphate, respectively. Meanwhile, when Tanfloc was used, they achieved 75%, 61%, 60% and 16% for the same respective pollutants. A significant rise in dissolved oxygen level in the aeration tank was observed when Tanfloc was applied (promising saving of energy during aeration). For instance, a dissolved oxygen level of 3 mg/L measured in experiments without Tanfloc, witnessed a climb to 6 mg/L when Tanfloc was used. In addition, volatile suspended solids concentration in the aeration tank decreased when Tanfloc was used (promising less production of sludge). Other measurements of total suspended solids (mg/L), chemical oxygen demand (mg/L) and biochemical oxygen demand (mg/L) in the experiments without Tanfloc were in the range (12-36), (60-104) and (24-50), respectively. Remarkably Tanfloc was able to reduce these measurements to low levels of (9-26), (28-68) and (7-24). In conclusion, the results suggest Tanfloc as promising agent to enhance the performance of clarification in a biological treatment unit. In light of this enhancement, Tanfloc could be used to upgrade existing treatment plants or design compact treatment units. (c) 2018 Elsevier Ltd. All rights reserved.