Significant rise in concentration of saline wastewater entering the treatment plants has been resulting in many problems in the biological treatment processes. On the other hand, the specific conditions of physicochemical treatment methods for saline and hyper saline wastewater have limited their application on a large-scale. Over the past few decades, Sequencing Batch Reactor (SBR) process has been widely used as an efficient, well-designed and practical approach for treatment of domestic and industrial wastewater due to its cost-effectiveness and simplicity. SBR Performance can enhance by providing simultaneous suspended and attached growth of microorganisms which act as a hybrid growth. In this study, a lab-scale Hybrid Sequencing Batch Reactor (HSBR) with 6.4 l working volume was used to examine the effect of salinity (NaCl), increased from 0 to 6.7% (g NaCl/ L wastewater), on the biological treatment. Therefore, COD, MLSS, MLVSS and SVI parameters have been measured over a period of 7 months of operation. The operational parameters namely pH, dissolved oxygen (DO) and temperature were 7.5-8.5, 1.5-6.8 mg /L and 20-25 °C respectively during whole experiment. Influent COD of synthetic wastewater was maintained at 650 ± 25 mg/L. The HSBR Cycle time including, influent feeding, React, Settling and effluent discharge were 1/20/1/1 h respectively. Results indicated that by increasing salt concentration from 0 to 67.7 g NaCl/L, the COD removal efficiency reduced from 94.22 to 53.69%. Moreover, as the NaCl concentration increased, MLSS rose up to 69%, while MLVSS almost stayed constant and SVI dropped by 83%. The results indicated that the simultaneous use of suspended and attached growth of microorganisms and gradual increasing of salt content of wastewater could lead to greater biomass concentration and ultimately improvement in the degradation of organic matter. Besides, settling performance and its velocity were noticeably improved by increasing salinity.

中文翻译：

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在盐和高盐条件下杂交测序批处理反应器的性能评估。

进入处理厂的盐水废水浓度的显着上升已经导致生物处理过程中的许多问题。另一方面，生理盐水和高盐废水的物理化学处理方法的具体条件限制了它们的大规模应用。在过去的几十年中，测序间歇反应器（SBR）工艺因其成本效益和简便性而被广泛用作处理生活和工业废水的高效，精心设计和实用的方法。SBR性能可以通过同时提供微生物的悬浮和附着生长（作为杂种生长）来增强。在这项研究中，实验室容量为6.4 l的混合测序间歇反应器（HSBR）用于检查盐度（NaCl）的影响，经生物处理后，从0增加到6.7％（g NaCl / L废水）。因此，已在运行7个月的时间内测量了COD，MLSS，MLVSS和SVI参数。在整个实验过程中，pH，溶解氧（DO）和温度等操作参数分别为7.5-8.5、1.5-6.8 mg / L和20-25°C。合成废水的进水COD保持在650±25 mg / L。HSBR循环时间（包括进料，反应，沉降和废水排放）分别为1/20/1/1 h。结果表明，通过将盐浓度从0增加到67.7 g NaCl / L，COD去除效率从94.22降低到53.69％。此外，随着NaCl浓度的增加，MLSS上升至69％，而MLVSS几乎保持恒定，而SVI下降83％。结果表明，微生物的悬浮生长和附着生长的同时使用以及废水含盐量的逐步增加可以导致更高的生物量浓度并最终改善有机物的降解。此外，盐度的提高显着提高了沉降性能及其速度。