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Dissolved Organic Matter in Sludge
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Dissolved Organic Matter in Sludge

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: closed (15 July 2024) | Viewed by 6523

Special Issue Editor

Dr. Keke Xiao

E-Mail Website
Guest Editor
School of Environmental Science & Engineering, Guangdong Technion-Israel Institute of Technology, Shantou, China
Interests: sludge dewatering; anaerobic sludge digestion; dissolved organic matter; humic substances; anammox
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Dissolved organic matter in sludge has received considerable attention from many scientists of different disciplines. In sludge, the presence of dissolved organic matter may affect the biodegradation efficiency of anaerobic sludge digestion, the affinity towards bound water for sludge dewatering, sludge composting and sludge landfill treatment. As with many other areas of research, the progress made in one discipline may be limited by the current techniques, knowledge, or even dogma of another.

This Special Issue seeks to understand (1) the characteristics of dissolved organic matter in sludge; (2) current techniques for the determination of dissolved organic matter in sludge; (3) the influences of dissolved organic matter on the biochemical process during sludge treatment and disposal; and (4) the influences of humic substances on anaerobic sludge digestion. We welcome original papers addressing research themes including, but not limited to, the following:

  • The distribution and diversity of dissolved organic matter in sludge;
  • Methods for monitoring dissolved organic matter in sludge;
  • Effects of dissolved organic matter on anaerobic sludge digestion, sludge dewatering, sludge composting, and sludge landfill treatment;
  • Opinions on the measurements of humic substances in sludge: its extraction, distribution and dynamics;
  • The impacts of humic substances on sludge treatment and disposal;
  • Humic substances in sludge and the relationship with soil fertility.

Yours,

Dr. Keke Xiao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • dissolved organic matter
  • proteinaceous compounds
  • amino acids
  • humic substances
  • sludge treatment and disposal

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Published Papers (3 papers)

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Research

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11 pages, 2211 KiB  
Article
Simultaneous Mixotrophic Nitrate Removal and Phosphorus Removal in a Sponge-Iron Denitrifying Filter
by Xiangyu Sun, Chunyu Wang, Junbo Zhang, Zhongtai Chen, Ting Yu, Guangjing Xu and Jingni Xiao
Water 2023, 15(12), 2248; https://doi.org/10.3390/w15122248 - 15 Jun 2023
Cited by 1 | Viewed by 1947
Abstract
Due to stricter municipal wastewater discharge standards, there is an increased need for further treatment of nitrate in the secondary effluent of wastewater treatment plants. This is achieved through denitrification by the addition of external carbon sources, which leads to increased costs in [...] Read more.
Due to stricter municipal wastewater discharge standards, there is an increased need for further treatment of nitrate in the secondary effluent of wastewater treatment plants. This is achieved through denitrification by the addition of external carbon sources, which leads to increased costs in wastewater treatment. The aim of this study was to examine the possibility of simultaneous removal of nitrate and phosphorus from simulated secondary effluent by employing a sponge-iron-based denitrifying filter at room temperature. The results indicate that at hydraulic retention times of over 2 h, more than 60% of the nitrate was reduced to ammonia and nitrite via iron-based abiotic nitrate reduction. However, sponge iron easily scaled after two months of operation. Therefore, a little glucose was added to the influent, resulting in a final COD/N ratio of 1:1. Mixotrophic nitrate reduction was observed, and the rust of sponge iron was successfully dissolved. Batch test results demonstrate that biological nitrate denitrification accounted for 70.0% of the total nitrate reduction. Additionally, high-efficiency phosphorus removal through the chemical reaction of released iron and phosphorus was achieved throughout the entire experiment, with removal efficiencies of more than 90% at hydraulic retention times of over 2 h. Moreover, high-throughput sequencing data show that the species diversity obviously increased after adding organic carbon, suggesting the coexistence of heterotrophic and autotrophic denitrifiers. Hence, the sponge-iron denitrifying filter has considerable prospects in the field of secondary effluent treatment and is likely to be the future direction of zero-valent iron application in sewage treatment. Full article
(This article belongs to the Special Issue Dissolved Organic Matter in Sludge)
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10 pages, 1799 KiB  
Communication
Study on the Treatment of Simulated Recirculating Mariculture Wastewater by Thiosulfate-Based Autotrophic Denitrification
by Fan Gao, Ting Yu, Zhongtai Chen, Junbo Zhang, Huchun Xu, Guangjing Xu and Cuiya Zhang
Water 2023, 15(11), 2076; https://doi.org/10.3390/w15112076 - 30 May 2023
Viewed by 1621
Abstract
In this study, a sulfur-based autotrophic denitrifying filter (SADF) was developed for the purpose of removing nitrate from simulated recirculating mariculture wastewater. Results showed that over 90% of the nitrate could be effectively eliminated by utilizing thiosulfate as the electron donor, with a [...] Read more.
In this study, a sulfur-based autotrophic denitrifying filter (SADF) was developed for the purpose of removing nitrate from simulated recirculating mariculture wastewater. Results showed that over 90% of the nitrate could be effectively eliminated by utilizing thiosulfate as the electron donor, with a molar ratio of thiosulfate-S to nitrate molar ratio of 2:1 or greater. Additional batch tests confirmed that thiosulfate was a suitable sulfur source for nitrate removal even without prior accumulation of the biomass to nitrite. Excess thiosulfate had a minor impact on N-removal efficiency, so an external sulfur source was not required for nitrate removal, however, it could still help to reduce nitrate accumulation and water replacement to some extent. High-throughput sequencing results illustrated that Thiomicrospira and Thioalkalivibrio were the dominant autotrophic denitrifying genera in the SADF, while Thiomicrospira was more significantly affected in the case of insufficient sulfur sources. As the issue of nitrate accumulation in the mariculture recirculating system has been resolved, only a small amount of water needs to be added to the system daily. Therefore, the thiosulfate-based SADF process has the potential to be implemented for nitrate removal in mariculture systems, which could present a promising sustainable solution to the nitrate pollution issue. Full article
(This article belongs to the Special Issue Dissolved Organic Matter in Sludge)
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Review

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17 pages, 883 KiB  
Review
A Mini-Review on Safe Treatment and Valorization of Salt Waste in Chemical Production Processes in China
by Yang Lv, Yi Wang, Dapeng Zhang, Chaoyue Wu, Jun Zhang, Zehua Zhao, Mohammad Nabi, Xuan Luo and Keke Xiao
Water 2024, 16(11), 1620; https://doi.org/10.3390/w16111620 - 5 Jun 2024
Cited by 1 | Viewed by 2058
Abstract
In chemical production processes in China, a huge volume of salt waste is produced, contributing to environmental pollution due to the lack of proper treatment procedures to manage this waste effectively. With the current lack of proper treatment methods for salt waste disposal, [...] Read more.
In chemical production processes in China, a huge volume of salt waste is produced, contributing to environmental pollution due to the lack of proper treatment procedures to manage this waste effectively. With the current lack of proper treatment methods for salt waste disposal, landfill emerges as the predominant disposal approach adopted in China, exacerbating environmental concerns associated with the accumulation of such waste. In addition, this method fails to reuse and recycle salt waste. This review paper presents pertinent research on the safe disposal and utilization of salt waste in China. Well-known valorization methods, such as oxidation, thermal treatment, washing separation, precipitation, and evaporation crystallization, are comprehensively reviewed. The current technologies for recovering resources from salt waste and recommendations for its treatment and valorization are analyzed. This research work offers a reference for future resource utilization of industrial salt waste. Full article
(This article belongs to the Special Issue Dissolved Organic Matter in Sludge)
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