Effect of Hydraulic Retention Time on the Performance of High-Rate Activated Sludge System: a Pilot-Scale Study

被引：0
作者：
H. Guven
M. E. Ersahin
R. K. Dereli
H. Ozgun
D. Sancar
I. Ozturk
机构：
[1] Istanbul Technical University,Civil Engineering Faculty, Environmental Engineering Department
来源：
Water, Air, & Soil Pollution | 2017年 / 228卷
关键词：
Energy efficiency; Energy neutral wastewater treatment plant; Flocculation; High-rate activated sludge system; Hydraulic retention time;
D O I：
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学科分类号：
摘要：
Conventional activated sludge (CAS) technology has been the most commonly applied technology for treatment of municipal wastewater for more than a century; however, a significant portion of energy content of the wastewater cannot be recovered by this technology. Therefore, different modifications can be applied to the CAS technology in order to increase the energy harvesting from wastewaters. In this paper, physically treated wastewater from a municipal preliminary wastewater treatment plant (WWTP) was treated at a pilot-scale high-rate activated sludge (HRAS) system. The HRAS system was operated under three different hydraulic retention times (HRTs) and the treatment performances were evaluated. Within this concept, HRTs of 130, 95, and 60 min were tested. The results revealed that total chemical oxygen demand (tCOD) removal of 59% was achievable and the effluent total suspended solids (TSS) concentration was 90 mg/L at the HRT of 60 min. Effluent COD and TSS concentrations decreased with the decrease in HRT by means of enhanced flocculation and sedimentation. This is confirmed by the improvement of sludge volume index (SVI) values at decreased HRTs. The calculated mass balance showed that more COD was diverted to sludge stream with decrease in HRT. Diversion of more COD to sludge can improve the energy balance of wastewater treatment by the application of anaerobic sludge digestion. By this way, HRAS process would be a promising technology in the concept of energy efficient wastewater treatment systems.
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  • [1] Barber WPF(2014)Influence of wastewater treatment on sludge production and processing Water and Environment Journal 28 1-10
  • [2] Boehnke B(1998)Cost-effective reduction of high-strength wastewater by adsorption-based activated sludge technology Water Engineering & Management 145 31-34
  • [3] Schulze-Rettmer R(2001)Co-conditioning and dewatering of chemical sludge and waste activated sludge Water Research 35 786-794
  • [4] Zuckut SW(2016)Full-scale highly-loaded wastewater treatment processes (A-stage) to increase energy production from wastewater: performance and design guidelines Environmental Engineering Science 33 571-577
  • [5] Chang CR(2013)Operating aerobic wastewater treatment at very short sludge ages enables treatment and energy recovery through anaerobic sludge digestion Water Research 47 6546-6557
  • [6] Liu JC(2016)Comparison of bacterial communities of conventional and A-stage activated sludge systems Scientific Reports 6 1-11
  • [7] Lee DJ(2014)Sustainable wastewater treatment—ways to achieve energy neutrality HKIE Transactions 21 240-252
  • [8] de Graaff MS(2005)Kinetics of removal of particulate chemical oxygen demand in the activated-sludge process Water Environment Research 77 437-446
  • [9] van den Brand TPH(2015)High-rate activated sludge system for carbon management-evaluation of crucial process mechanisms and design parameters Water Research 87 476-482
  • [10] Roest K(1996)Effect of wastewater composition on treatment performance of a column bioreactor with recycle Bioprocess Engineering 14 245-248
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