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首页> 外文会议>International Water Association(IWA) Conference; 20050518-20; Xi'an(CN) >Physico-chemical activated sludge enhanced treatment in CEPT process
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Physico-chemical activated sludge enhanced treatment in CEPT process

机译：CEPT工艺中的理化活性污泥强化处理

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The elevated chemical cost is one of main concerned issues in the Chemically Enhanced Primary Treatment (CEPT) nowadays. The sludge gotten from the coagulation-flocculation-sedimentation process shows a high concentration of ions and high potential of adsorption capability. Therefore, the sludge after activated with acid or aeration could be reused to enhance flocculation in CEPT process. In this study, CEPT sludge produced after sedimentation was recycled after aerated and adjusted pH to reduce fresh ferric chloride dose and promote the organic removal efficiency. It was found that the enhanced removal efficiencies of turbidity, UV254, COD, total phosphorus (TP) and PO_4-P were about 98%, 66%, 51%, 96% and 100% respectively as 16 mg/L of ferric chloride and 75 mg/L aerated chemical sludge were added, which exceeded the chemical flocculation process by 13%, 32%,8.6%, 3.7% and 1.3%, respectively. The pH played a significant role in the sludge reuse process. Experiments showed that the ferric ions could be dissolved out richer from the sludge at initial pH 3-4.
机译：化学费用的上涨是当今化学强化初级处理（CEPT）的主要关注问题之一。混凝-沉淀-沉淀工艺得到的污泥离子浓度高，吸附能力高。因此，经酸或曝气活化后的污泥可再利用，以增强CEPT工艺的絮凝效果。在这项研究中，沉淀后产生的CEPT污泥经充气和调节pH值后被回收，以减少新鲜氯化铁的用量并提高有机去除效率。结果发现，当氯化铁和氯化铁为16 mg / L时，浊度，UV254，COD，总磷（TP）和PO_4-P的去除效率分别约为98％，66％，51％，96％和100％。添加了75 mg / L的充气化学污泥，分别超过化学絮凝工艺的13％，32％，8.6％，3.7％和1.3％。 pH在污泥再利用过程中起着重要作用。实验表明，在初始pH 3-4时，铁离子可以从污泥中富集出来。

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