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Enhanced Reverse Osmosis Concentrate Disposal and Nutrients Conversion to Microalgae Bioenergy with a Gradient-Fed Strategy
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-08 , DOI: 10.1021/acssuschemeng.0c07696 Rui Hu 1 , Haixing Chang 1 , Yajun Zou 1 , Haowen Feng 1 , Haihua Wu 1 , Wenbo Wu 1 , Nianbing Zhong 2 , Xuejun Quan 1 , Sha Zhao 3 , Jing Yang 1 , Shuo Zhang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-08 , DOI: 10.1021/acssuschemeng.0c07696 Rui Hu 1 , Haixing Chang 1 , Yajun Zou 1 , Haowen Feng 1 , Haihua Wu 1 , Wenbo Wu 1 , Nianbing Zhong 2 , Xuejun Quan 1 , Sha Zhao 3 , Jing Yang 1 , Shuo Zhang 1
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Reverse osmosis concentrate (ROC) disposal with microalgae has attracted increasing interest because of its intrinsic advantages, like simultaneous wastewater remediation and bioenergy production. But these processes are currently suffering from inefficient nutrients removal and poor microalgae growth due to ROC toxicity. A gradient-fed strategy is proposed to enhance ROC disposal and nutrients conversion to microalgal Chlorella vulgaris lipid by adjusting the ROC feeding. Time-evolving profiles of nutrients and chemical oxygen demand (COD) during experiments as well as their influences on microalgae growth and metabolism have been investigated. Results indicate that the removal of NH4+ and COD using the gradient-fed process was improved by 104.3% and 214.2% compared to those obtained in batch mode, generating a high-quality ROC effluent with N and P nutrients almost totally removed. Microalgae biomass and lipid content were simultaneously enhanced with the gradient-fed process. Energy production analysis showed that the highest energy yield was achieved with use of the gradient-fed process at 30%–70%–100% as 39.0 kJ/L, which was higher than the volumetric heat value of natural gas (about 36.0 kJ/L) and significantly higher than that obtained in batch mode (21.6 kJ/L). This work provides a practical strategy for large-scale microalgae cultivation with ROC.
中文翻译：
梯度喂养策略增强了反渗透浓缩液的处理并将营养物转化为微藻生物能
利用微藻处理反渗透浓缩液（ROC）吸引了越来越多的关注，因为它具有内在优势，例如同时进行废水修复和生物能源生产。但是，由于ROC毒性，这些过程目前遭受营养去除效率低下和微藻生长不良的困扰。提出了一种梯度饲喂策略，可通过调整ROC饲喂量来提高ROC处置能力，并将养分转化为微藻小球藻脂质。已经研究了实验过程中养分和化学需氧量（COD）随时间变化的概况以及它们对微藻生长和代谢的影响。结果表明，NH 4 +的去除与以分批方式获得的COD相比，使用梯度进料工艺的COD分别提高了104.3％和214.2％，从而产生了高质量的ROC废水，其中N和P养分几乎被完全去除。微藻生物量和脂质含量通过梯度饲喂过程同时提高。能源生产分析表明，使用梯度进料工艺以30％–70％–100％的比例达到39.0 kJ / L可获得最高的能源产量，高于天然气的体积热值（约36.0 kJ / L）。 L），并且明显高于批处理模式（21.6 kJ / L）。这项工作为利用ROC进行大规模微藻培养提供了实用的策略。
更新日期：2021-01-18
中文翻译：
梯度喂养策略增强了反渗透浓缩液的处理并将营养物转化为微藻生物能
利用微藻处理反渗透浓缩液（ROC）吸引了越来越多的关注，因为它具有内在优势，例如同时进行废水修复和生物能源生产。但是，由于ROC毒性，这些过程目前遭受营养去除效率低下和微藻生长不良的困扰。提出了一种梯度饲喂策略，可通过调整ROC饲喂量来提高ROC处置能力，并将养分转化为微藻小球藻脂质。已经研究了实验过程中养分和化学需氧量（COD）随时间变化的概况以及它们对微藻生长和代谢的影响。结果表明，NH 4 +的去除与以分批方式获得的COD相比，使用梯度进料工艺的COD分别提高了104.3％和214.2％，从而产生了高质量的ROC废水，其中N和P养分几乎被完全去除。微藻生物量和脂质含量通过梯度饲喂过程同时提高。能源生产分析表明，使用梯度进料工艺以30％–70％–100％的比例达到39.0 kJ / L可获得最高的能源产量，高于天然气的体积热值（约36.0 kJ / L）。 L），并且明显高于批处理模式（21.6 kJ / L）。这项工作为利用ROC进行大规模微藻培养提供了实用的策略。
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