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In−situ sludge reduction and carbon reuse in an anoxic/oxic process coupled with hydrocyclone breakage
Water Research ( IF 12.8 ) Pub Date : 2018-05-09 , DOI: 10.1016/j.watres.2018.05.010
Yinxiang Xu , Yuanyuan Fang , Zhenhua Wang , Dan Guo , Yi Liu , Yuan Huang , Pengbo Fu , Juehui Jin , Chenwen Wei , Hualin Wang , Tao Zeng

The long−term performance of an anoxic−oxic−hydrocyclone (AOH) process with an in−situ hydrocyclone treatment unit in the mixed liquid return line for sludge reduction and carbon reuse has been observed, in comparison with a conventional anoxic−oxic (AO) process. Three parallel side−stream systems, including one AOH25 system with a 25−mm hydrocyclone, one AOH35 system with a 35−mm hydrocyclone and one AO system, were built and fed with real wastewater for a comparative study in a wastewater treatment plant. The results demonstrated that the hydrocyclone in the AOH process was able to break macro−flocs into smaller flocs. And the desorption of the extracellular polymeric substance from return activated sludge (AS) leaded to an average increase of 62.97% and 36.36% in SCOD in the AOH25 and AOH35 system, respectively. In addition, shear force, centrifugal force of revolution and flocs’ rotation in the hydrocyclone were proposed to be the main influence mechanism of hydrocyclone treatment on AS property. Compared with the AO process, the SCOD concentration in the effluent of the AOH processes presented a decrease of 12.0 mg/L and the TN was reduced by 21.50% owing to the released carbon sources reuse. Moreover, the sludge production was reduced by 36.81% and 35.92% in the AOH25 and AOH35 process, respectively. By contrast, the AOH25 system is better than the AOH35 system.



中文翻译:

缺氧/有氧过程中原位污泥的减少和碳的再利用以及水力旋流器的破损

与传统的缺氧-氧气(AO)相比,已观察到在混合液体回流管线中采用原位水力旋流器处理单元的缺氧-氧气-水力旋流器(AOH)工艺的长期性能) 过程。三个平行侧流系统,包括一个带有25毫米水力旋流器的AOH 25系统,一个AOH 35建造了一个带有35毫米水力旋流器和一个AO系统的系统,并注入了真实的废水,用于在废水处理厂进行比较研究。结果表明,AOH过程中的水力旋流器能够将宏观絮凝物分解成较小的絮凝物。回流活性污泥(AS)对细胞外聚合物的解吸导致AOH 25和AOH 35的SCOD平均增加62.97%和36.36%系统。此外,提出了水力旋流器中的剪切力,旋转离心力和絮状物的旋转是水力旋流器处理对AS性能的主要影响机理。与AO工艺相比,AOH工艺出水中的SCOD浓度降低了12.0 mg / L,而TN由于碳源的释放而减少了21.50%。此外,在AOH 25和AOH 35工艺中,污泥产生分别减少了36.81%和35.92%。相反,AOH 25系统优于AOH 35系统。

更新日期:2018-05-09
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