Optimizing performance efficiency of algal-bacterial-based wastewater treatment system using response surface methodology

IF 4.9 Q2 ENGINEERING, ENVIRONMENTAL Groundwater for Sustainable Development Pub Date : 2024-07-04 DOI:10.1016/j.gsd.2024.101273
Samar A. El-Mekkawi , Sayeda M. Abdo , Marwa A. Youssef , Gamila H. Ali
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Abstract

Developing wastewater treatment technologies is crucial for enhancing treatment efficiency and promoting the reuse of treated water. In this article, the Algal-Bacterial integrated system (ABIS) is employed to treat municipal wastewater collected from the Zenin wastewater treatment plant in Giza governorate, Egypt. This system relies on the synergy between heterotrophic bacteria and microalgae to form a biofilm capable of absorbing contaminants from the wastewater. The main objective of this study is to optimize the factors influencing the treatment efficiency using response surface methodology derived from the experimental design software of Design Expert 6.0.8. The optimal results revealed that using an absorber amount of 0.18 g/L for a hydraulic retention time of 1.4 d provides removal efficiency of BOD, COD, TSS, and turbidity are 88.57%, 82.7 %, 94.90%, and 95.91%, respectively. These findings were experimentally and statistically verified with an accuracy exceeding a 95% confidence interval and 95% prediction interval. The physicochemical characteristics, algal community structure, as well as the density of total coliform, fecal coliform, and Escherichia coli (E. coli), were determined for the treated wastewater and compared to the Egyptian code of practice for the use of treated municipal wastewater for agricultural purposes to assess its suitability for unrestricted irrigation.

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利用响应面方法优化藻类-细菌废水处理系统的性能效率
开发废水处理技术对于提高处理效率和促进处理后水的再利用至关重要。本文采用藻类细菌综合系统 (ABIS) 处理从埃及吉萨省泽宁污水处理厂收集的城市污水。该系统依靠异养细菌和微藻之间的协同作用形成生物膜,能够吸收废水中的污染物。本研究的主要目的是利用 Design Expert 6.0.8 实验设计软件中的响应面方法优化影响处理效率的因素。优化结果表明,在水力停留时间为 1.4 d 时,吸收剂用量为 0.18 g/L,对 BOD、COD、TSS 和浊度的去除率分别为 88.57%、82.7%、94.90% 和 95.91%。这些结果经过实验和统计验证,准确率超过了 95% 的置信区间和 95% 的预测区间。对处理后废水的理化特性、藻类群落结构以及总大肠菌群、粪大肠菌群和大肠埃希氏菌(E. coli)的密度进行了测定,并与埃及将处理后的城市污水用于农业目的的操作规范进行了比较,以评估其是否适合用于无限制灌溉。
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来源期刊
Groundwater for Sustainable Development
Groundwater for Sustainable Development Social Sciences-Geography, Planning and Development
CiteScore
11.50
自引率
10.20%
发文量
152
期刊介绍: Groundwater for Sustainable Development is directed to different stakeholders and professionals, including government and non-governmental organizations, international funding agencies, universities, public water institutions, public health and other public/private sector professionals, and other relevant institutions. It is aimed at professionals, academics and students in the fields of disciplines such as: groundwater and its connection to surface hydrology and environment, soil sciences, engineering, ecology, microbiology, atmospheric sciences, analytical chemistry, hydro-engineering, water technology, environmental ethics, economics, public health, policy, as well as social sciences, legal disciplines, or any other area connected with water issues. The objectives of this journal are to facilitate: • The improvement of effective and sustainable management of water resources across the globe. • The improvement of human access to groundwater resources in adequate quantity and good quality. • The meeting of the increasing demand for drinking and irrigation water needed for food security to contribute to a social and economically sound human development. • The creation of a global inter- and multidisciplinary platform and forum to improve our understanding of groundwater resources and to advocate their effective and sustainable management and protection against contamination. • Interdisciplinary information exchange and to stimulate scientific research in the fields of groundwater related sciences and social and health sciences required to achieve the United Nations Millennium Development Goals for sustainable development.
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