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      Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

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          Abstract

          Swine wastewater contains high concentrations of organic compounds, nutrients (nitrogen and phosphorus), heavy metals, and residual antibiotics, amongst others, that have negative impacts on the water environment. The main aim of this work was to remove nutrients from anaerobically digested swine wastewater using an intermittent cycle extended aeration system (ICEAS). The effects of operational parameters such as cycle time, organic loading rate, C/N ratio, and aeration/mixing ratio on the pollutant removal efficiencies of ICEAS were studied and compared with the performance of a conventional sequencing batch reactor (SBR). The following optimal conditions were obtained: cycle time, 6 h; organic loading rate, 0.86 kg COD m −3 day −1; C/N ratio, 2.49–2.82; and aeration/mixing ratio, 1.57. The pH was maintained in the range of 6.0–8.0. The total organic carbon (TOC), total nitrogen (TN), ammonium (NH 4 +), total phosphorus (TP), and color removal efficiencies of ICEAS were higher than those of the conventional SBR, with removal efficiencies of 95.22, 88.29, 97.69, 85.81, and 97.84%, respectively, compared to 94.34, 81.16, 94.15, 77.94, and 96.95%, respectively, observed in the SBR. TOC, TN, NH 4 +, TP, and the color removal efficiencies of ICEAS were higher by 0.88, 7.13, 3.54, 7.87, and 0.95%, respectively, than the conventional SBR. The good results from this study show that ICEAS is a promising technology for the removal of organic contaminants and nutrients from anaerobically digested swine wastewater and that the effluent water quality meets the Vietnamese discharge standard (QCVN 62-MT:2016/BTNMT) for swine wastewater effluents.

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          Landfill leachate treatment: Review and opportunity.

          S Renou, J.G. Givaudan, S Poulain … (2008)
          In most countries, sanitary landfilling is nowadays the most common way to eliminate municipal solid wastes (MSW). In spite of many advantages, generation of heavily polluted leachates, presenting significant variations in both volumetric flow and chemical composition, constitutes a major drawback. Year after year, the recognition of landfill leachate impact on environment has forced authorities to fix more and more stringent requirements for pollution control. This paper is a review of landfill leachate treatments. After the state of art, a discussion put in light an opportunity and some results of the treatment process performances are given. Advantages and drawbacks of the various treatments are discussed under the items: (a) leachate transfer, (b) biodegradation, (c) chemical and physical methods and (d) membrane processes. Several tables permit to review and summarize each treatment efficiency depending on operating conditions. Finally, considering the hardening of the standards of rejection, conventional landfill leachate treatment plants appear under-dimensioned or do not allow to reach the specifications required by the legislator. So that, new technologies or conventional ones improvements have been developed and tried to be financially attractive. Today, the use of membrane technologies, more especially reverse osmosis (RO), either as a main step in a landfill leachate treatment chain or as single post-treatment step has shown to be an indispensable means of achieving purification.
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            Occurrence of antibiotics in water, sediments, aquatic plants, and animals from Baiyangdian Lake in North China.

            Wenhui Li, Yali Shi, Lihong Gao … (2012)
            This study investigated the presence and distribution of 22 antibiotics, including eight quinolones, nine sulfonamides and five macrolides, in the water, sediments, and biota samples from Baiyangdian Lake, China. A total of 132 samples were collected in 2008 and 2010, and laboratory analyses revealed that antibiotics were widely distributed in the lake. Sulfonamides were the dominant antibiotics in the water (0.86-1563 ng L(-1)), while quinolones were prominent in sediments (65.5-1166 μg kg(-1)) and aquatic plants (8.37-6532 μg kg(-1)). Quinolones (17.8-167 μg kg(-1)) and macrolides [from below detection limit (BDL) to 182 μg kg(-1)] were often found in aquatic animals and birds. Salvinia natans exhibited the highest bioaccumulation capability for quinolones among three species of aquatic plants. Geographical differences of antibiotic concentrations were greatly due to anthropogenic activities. Sewage discharged from Baoding City was likely the main source of antibiotics in the lake. Risk assessment of antibiotics on aquatic organisms suggested that algae and aquatic plants might be at risk in surface water, while animals were likely not at risk. Copyright © 2012 Elsevier Ltd. All rights reserved.
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              Water analysis: emerging contaminants and current issues.

              Thomas A. Ternes, Christopher D. Richardson (2011)
              Article 0 comments Cited 75 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Journal
                Journal ID (nlm-ta): Front Microbiol
                Journal ID (iso-abbrev): Front Microbiol
                Journal ID (publisher-id): Front. Microbiol.
                Title: Frontiers in Microbiology
                Publisher: Frontiers Media S.A.
                ISSN (Electronic): 1664-302X
                Publication date (Electronic): 16 October 2020
                Publication date Collection: 2020
                Volume: 11
                Electronic Location Identifier: 576438
                Affiliations
                [1] 1Department of Chemical Engineering, Nong Lam University , Ho Chi Minh City, Vietnam
                [2] 2Department of Environmental Engineering and Water Technology, IHE Delft Institute for Water Education , Delft, Netherlands
                [3] 3Master Program in Water Program Technology, Reuse and Management, Vietnamese German University , Thu Dau Mot, Vietnam
                Author notes

                Edited by: Byong-Hun Jeon, Hanyang University, South Korea

                Reviewed by: Jiu-Qiang Xiong, Ocean University of China, China; Shashi Kant Bhatia, Konkuk University, South Korea; Gaurav Saxena, Jawaharlal Nehru University, India; El-Sayed Salama, Lanzhou University, China

                *Correspondence: Tran Le Luu, luu.tl@ 123456vgu.edu.vn

                This article was submitted to Microbiotechnology, a section of the journal Frontiers in Microbiology

                Article
                DOI: 10.3389/fmicb.2020.576438
                PMC ID: 7596319
                SO-VID: f1773ab3-23eb-4f8b-8e2f-d7d51ca014ef
                Copyright © Copyright © 2020 Dan, Rene and Le Luu.
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                Date received : 29 June 2020
                Date accepted : 18 September 2020
                Page count
                Figures: 6, Tables: 1, Equations: 6, References: 73, Pages: 11, Words: 8664
                Funding
                Funded by: Vietnam National Foundation for Science and Technology Development (NAFOSTED)
                Award ID: 105.08-2019.22
                Categories
                Subject: Microbiology
                Subject: Original Research

                ScienceOpen disciplines: Microbiology & Virology
                Keywords: swine wastewater,intermittent cycle extended aeration system,nutrient,biological,anaerobic
                Data availability:
                ScienceOpen disciplines: Microbiology & Virology
                Keywords: swine wastewater, intermittent cycle extended aeration system, nutrient, biological, anaerobic

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