The disposal of reverse osmosis (RO) concentrate (ROC) is a critical challenge impeding the application of RO-based wastewater reclamation. Herein, we proposed an enhanced biotreatment approach for the simultaneous removal of nitrogen, phosphorous, hardness, and methylisothiazolinone (MIT) from ROC by suspended-solid phase cultivation of Scenedesmus sp. LX1. Repeated carrier addition, guided by the developed optimal carrier addition model, efficiently enhanced algal growth and contaminant removal through dynamically controlling the suspended algal density by cell attachment. The maximum algal growth rate (212.2 mg/(L∙d)) increased by 41% compared with the control, and the time needed for reaching the maximum algal biomass (906.7 mg/L) was shortened by 1 d, attributing to the mitigation of density restriction. 91.8% of nitrogen (30.2 mg/L) was removed with 5.5 mg/(L∙d) accelerating removal rate, and phosphate (3.7 mg/L) was completely removed within 1 d. Hardness precursors calcium and inorganic carbon were also removed in large amounts, 268.4 and 128.2 mg/L, respectively. Moreover, suspended-solid phase cultivation significantly mitigated the growth inhibition caused by MIT toxicity, enabled the algae to completely biodegrade MIT of extremely high concentrations (4.7 mg/L and 11.4 mg/L) in a short time. Our results demonstrate the feasibility of suspended-solid phase algal cultivation for simultaneously and effectively removing multiple main contaminants from ROC.

中文翻译：

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通过悬浮固相培养Scenedesmus sp。增强反渗透浓缩物中同时去除氮，磷，硬度和甲基异噻唑啉酮的能力。LX1。

反渗透（RO）精矿（ROC）的处置是阻碍基于RO的废水回收应用的关键挑战。在这里，我们提出了一种增强的生物处理方法，用于通过悬浮固相培养Scenedesmus sp。同时从ROC中去除氮，磷，硬度和甲基异噻唑啉酮（MIT）。LX1。通过开发的最佳载体添加模型，重复进行载体添加，可通过动态控制细胞附着的悬浮藻密度，有效提高藻类生长和污染物去除能力。与对照相比，最大藻类生长速率（212.2 mg /（L∙d））增加了41％，达到最大藻类生物量（906.7 mg / L）所需的时间缩短了1 d，这归因于缓解密度限制。氮的91.8％（30。以5.5 mg /（L∙d）的加速去除率去除了2 mg / L），并在1 d内完全去除了磷酸盐（3.7 mg / L）。硬度前体钙和无机碳也分别被大量去除，分别为268.4和128.2 mg / L。此外，悬浮固相培养显着减轻了由MIT毒性引起的生长抑制，使藻类能够在短时间内完全生物降解极高浓度（4.7 mg / L和11.4 mg / L）的MIT。我们的结果证明了悬浮固相藻类培养可同时有效地去除ROC中的多种主要污染物的可行性。分别。此外，悬浮固相培养显着减轻了由MIT毒性引起的生长抑制，使藻类能够在短时间内完全生物降解极高浓度（4.7 mg / L和11.4 mg / L）的MIT。我们的结果证明了悬浮固相藻类培养可同时有效地去除ROC中的多种主要污染物的可行性。分别。此外，悬浮固相培养显着减轻了由MIT毒性引起的生长抑制，使藻类能够在短时间内完全生物降解极高浓度（4.7 mg / L和11.4 mg / L）的MIT。我们的结果证明了悬浮固相藻类培养可同时有效地去除ROC中的多种主要污染物的可行性。