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Powdered activated carbon full-scale addition to the activated sludge reactor of a municipal wastewater treatment plant: Pharmaceutical compounds control and overall impact on the process
Journal of Water Process Engineering ( IF 6.3 ) Pub Date : 2022-07-09 , DOI: 10.1016/j.jwpe.2022.102975
Margarida Campinas , Rui M.C. Viegas , Cristina M.M. Almeida , António Martins , Catarina Silva , Elsa Mesquita , Maria Rosário Coelho , Sofia Silva , Vítor Vale Cardoso , Maria João Benoliel , Maria João Rosa

Powdered activated carbon (PAC) dosing to a conventional activated sludge (AS) reactor is a low-investment option for controlling pharmaceutical compounds (PhCs) in municipal wastewater treatment, but its advantages and limitations in real operating environments are not fully assessed. A 3-week PAC-AS full-scale test was conducted in an oxidation ditch plant to assess PAC impact on effluent quality (PhCs, dissolved organic carbon (DOC) and other parameters), energy consumption, sludge production and costs. DOC-normalized PAC doses of 0.7–2.6 mgPAC/mgDOC significantly reduced recalcitrant PhC discharge (e.g. by 63–83 % for carbamazepine and 67–69 % for diclofenac), the higher dose yielding a more reliable effluent quality. Effluent quality for total phosphorus, colour, organic matter and transmittance was also enhanced and no interference with nitrification, oxidation-reduction potential or dissolved oxygen in the oxidation ditch was observed, resulting in no energy consumption increase. PAC had no impact on effluent turbidity and mixed liquor suspended solids settleability, showing a positive effect on dewatered sludge dry weight and ultimately a 7–9 % increase on final sludge production. After stopping PAC dosing, PAC remaining in the return sludge presented adsorption capacity for some PhCs until it was completely out of the system. Estimated costs for PAC addition to AS-reactor compare favourably with literature data for PAC and GAC post-treatment and similarly with post-ozonation.



中文翻译:

将粉状活性炭全面添加到市政污水处理厂的活性污泥反应器中:药物化合物控制和对工艺的整体影响

将粉末活性炭 (PAC) 投加到传统的活性污泥 (AS) 反应器中,是控制城市废水处理中药物化合物 (PhC) 的一种低投资选择,但其在实际操作环境中的优势和局限性尚未得到充分评估。在氧化沟厂进行了为期 3 周的 PAC-AS 全面测试,以评估 PAC 对出水质量(PhC、溶解有机碳 (DOC) 和其他参数)、能源消耗、污泥产量和成本的影响。0.7-2.6 mgPAC/mgDOC 的 DOC 标准化 PAC 剂量显着减少了顽固性 PhC 排放(例如,卡马西平减少 63-83%,双氯芬酸减少 67-69%),更高的剂量产生更可靠的出水质量。总磷、颜色、出水水质 有机物和透光率也有所提高,对氧化沟内的硝化作用、氧化还原电位或溶解氧没有干扰,因此没有增加能耗。PAC 对出水浊度和混合液悬浮固体沉降性没有影响,显示出对脱水污泥干重的积极影响,最终使最终污泥产量增加 7-9%。停止 PAC 投加后,残留在返回污泥中的 PAC 对某些 PhC 具有吸附能力,直到完全脱离系统。将 PAC 添加到 AS 反应器的估计成本优于 PAC 和 GAC 后处理的文献数据,并且与臭氧后处理类似。从而不会增加能耗。PAC 对出水浊度和混合液悬浮固体沉降性没有影响,显示出对脱水污泥干重的积极影响,最终使最终污泥产量增加 7-9%。停止 PAC 投加后,残留在返回污泥中的 PAC 对某些 PhC 具有吸附能力,直到完全脱离系统。将 PAC 添加到 AS 反应器的估计成本优于 PAC 和 GAC 后处理的文献数据,并且与臭氧后处理类似。从而不会增加能耗。PAC 对出水浊度和混合液悬浮固体沉降性没有影响,显示出对脱水污泥干重的积极影响,最终使最终污泥产量增加 7-9%。停止 PAC 投加后,残留在返回污泥中的 PAC 对某些 PhC 具有吸附能力,直到完全脱离系统。将 PAC 添加到 AS 反应器的估计成本优于 PAC 和 GAC 后处理的文献数据,并且与臭氧后处理类似。残留在回流污泥中的 PAC 对某些 PhC 具有吸附能力,直到完全脱离系统。将 PAC 添加到 AS 反应器的估计成本优于 PAC 和 GAC 后处理的文献数据,并且与臭氧后处理类似。残留在回流污泥中的 PAC 对某些 PhC 具有吸附能力,直到完全脱离系统。将 PAC 添加到 AS 反应器的估计成本优于 PAC 和 GAC 后处理的文献数据,并且与臭氧后处理类似。

更新日期:2022-07-10
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