Behavior of Sludge Dewaterability and Nutrient Contents after Treatment with Cellulose-Based Flocculants with Combined PTS and Catalytic Behavior of Sludge towards Tetracycline Degradation

IF 3.6 Q2 ENVIRONMENTAL SCIENCES

Resources Pub Date : 2023-01-17 DOI:10.3390/resources12020017

Jannatul Rumky, Ekaterina Bandina, Eveliina Repo

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引用次数: 1

Abstract

Wastewater treatment plants are increasingly interested in adopting inorganic coagulants and organic flocculants in their sludge treatment process since sludge disposal costs more than half of the overall operational costs. This study synthesized poly titanium sulfate (PTS) by different molar ratios and used the best one with cellulose-based flocculants for sludge conditioning. PTS synthesized with a 1:2 molar ratio showed the lowest capillary suction time (CST) of sludge and was selected for further studies with cellulose-based flocculants. As bio-based flocculants have gained popularity due to current environmental problems, cationized cellulose-based flocculants (Ce-CTA) were used in this work with or without PTS for sludge treatment. After coagulation–flocculation, dewaterability of sludge enhanced, and the Lowry and Anthrone method was used to assess proteins and polysaccharides. Next, metal content and nutrients such as total phosphorus, phosphate, and nitrate were measured by ICP-OES and IC, and we found promising results of phosphate especially at pH 3. Higher total phosphorus content was found at pH 3 and 9, and even at pH 6 after PTS or PTS+Ce-CTA treatment. In addition, PTS-treated sludge materials also showed catalytic behavior, suggesting a new research avenue for future development. Based on this study, the PTS+Ce-CTA combination is promising for sludge treatment and nutrient recovery, along with the possibility for the further valorization of the sludge materials.

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纤维素基絮凝剂联合PTS处理后污泥脱水性能和养分含量的变化及污泥对四环素降解的催化行为

污水处理厂对在污泥处理过程中采用无机混凝剂和有机絮凝剂越来越感兴趣，因为污泥处理成本占总运营成本的一半以上。本研究以不同的摩尔比合成聚硫酸钛(PTS)，并将最佳的一种与纤维素基絮凝剂混合用于污泥处理。以1:2摩尔比合成的PTS对污泥的毛细吸力时间(CST)最低，可用于纤维素基絮凝剂的进一步研究。由于当前的环境问题，生物基絮凝剂得到了广泛的应用，在本研究中，阳离子化纤维素基絮凝剂(Ce-CTA)在加或不加PTS的情况下用于污泥处理。混凝-絮凝处理后，污泥脱水能力增强，采用Lowry - Anthrone法测定蛋白质和多糖含量。接下来，用ICP-OES和IC测量了金属含量和营养成分，如总磷、磷酸盐和硝酸盐，我们发现磷酸盐的结果很有希望，特别是在pH为3的情况下。PTS或PTS+Ce-CTA处理后，pH为3和9时总磷含量较高，pH为6时也较高。此外，pts处理的污泥材料也表现出催化行为，为未来的发展提供了新的研究途径。基于本研究，PTS+Ce-CTA组合有望用于污泥处理和营养物质回收，以及污泥材料进一步增值的可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resources Environmental Science-Nature and Landscape Conservation

CiteScore

7.20

自引率

6.10%

发文量

审稿时长

11 weeks

期刊介绍： Resources (ISSN 2079-9276) is an international, scholarly open access journal on the topic of natural resources. It publishes reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and methodical details must be provided so that the results can be reproduced. There are, in addition, unique features of this journal: manuscripts regarding research proposals and research ideas will be particularly welcomed, electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Subject Areas: natural resources, water resources, mineral resources, energy resources, land resources, plant and animal resources, genetic resources, ecology resources, resource management and policy, resources conservation and recycling.