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Physical Treatment of Municipal Sewage and Drinking Water
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Physical Treatment of Municipal Sewage and Drinking Water

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

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 5214

Special Issue Editors

Dr. Jinyi Tian

E-Mail Website
Guest Editor
School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China
Interests: physical separation; hydrocyclone; water treatment; water source heat pump; CFD simulation; granular sludge; circular economy
Dr. Xiaobin Tang

E-Mail Website
Guest Editor
School of Environment, Harbin Institute of Technology, Harbin, China
Interests: membrane fouling; membrane-based water treatment; membrane fabrication; drinking water treatment; water reuse; decentralized water treatment; iron and manganese removal; heavy metals removal
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The 100-year-old biological treatments based on ‘activated-sludge process’ has made historic contributions to human wastewater treatment. However, it mineralizes rather than recovers wastewater resources. It emits carbon dioxide, methane, and nitrous oxide, and wastes thermal energy in wastewater. The micropollutants (e.g., SARS-CoV-2 and microplastics) cannot be removed by using biological treatments. As a result, a large amount of disinfectant, which can produce carcinogenic and even genotoxic disinfection by-products, needs to be put into wastewater. Conversely, physical treatments are considered to be clean water treatment technology. Because physical treatments do not need to add additional chemicals, nor do they have biological pollution and other issues. Therefore, it is urgent to develop advanced insoluble-pollutants physical separators and soluble-pollutants physical separators with high separation efficiency and low energy consumption. In this Special Issue we welcome not only experimental studies, but also theoretical and numerical simulation studies on physical treatment of municipal sewage and drinking water. In particular, the following topics are encouraged: (1) novel approaches and practices on insoluble-pollutants physical separators; (2) novel approaches and practices on soluble-pollutants physical separators; (3) novel approaches and practices on source separators; (4) wastewater heat recovery devices; and (5) novel approaches and practices on physical disinfection.

Dr. Jinyi Tian
Dr. Xiaobin Tang
Guest Editors

Manuscript Submission Information

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Keywords

  • membrane
  • sedimentation
  • hydrocyclone
  • filtration
  • adsorption
  • desorption
  • separation
  • nanotechnology
  • fluid dynamics
  • artificial intelligence

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Published Papers (2 papers)

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11 pages, 3358 KiB  
Article
Effect of Reactor Stages in Series in the Main Anoxic Section on Anoxic Phosphorus Absorption Performance of Modified A2O Process
by Bojiao Yan, Jing Luo, Xiaoling Wang and Hai Lu
Water 2022, 14(24), 4082; https://doi.org/10.3390/w14244082 - 14 Dec 2022
Cited by 1 | Viewed by 1765
Abstract
Based on the kinetics of the treatment process of the completely mixed reactor in series, this study reveals the relationship between the reactor stages and the treatment efficiency, and it was applied to the simultaneous nitrogen and phosphorus removal process. The strengthening effect [...] Read more.
Based on the kinetics of the treatment process of the completely mixed reactor in series, this study reveals the relationship between the reactor stages and the treatment efficiency, and it was applied to the simultaneous nitrogen and phosphorus removal process. The strengthening effect of the reactor stages of the main anoxic sections on the anoxic phosphorus absorption efficiency and the contribution to improving the treatment effect were investigated. Using sewage with a low carbon-to-nitrogen ratio as the research object and keeping the operation parameters of the improved anaerobic–anoxic–oxic (A2O) process unchanged, the experimental research was carried out under the condition that reactor stages in series of the main anoxic section were one, two, three and four, respectively. The results showed an increase in the number of reactors in series in the main anoxic zone. The total phosphorus (TP) concentration in the effluent of the main anoxic stage decreased significantly, and the phosphorus uptake increased from 4.411 g/d (when n; the number of reactor stages in series was one) to 5.086 g/d when n was 4. Additionally, the nitrate nitrogen (NO3−–N) concentration in the effluent decreased, from 12.53 mg/L when n was one, to 9.62 mg/L when n was four, the removal rate of total nitrogen (TN) increased, from 56.86% when n was one to 65.98% when n was four, and the reduction power of nitrate nitrogen increased, and the denitrification rate increased. The increase in the number of reactors in series enhanced the anoxic phosphorus absorption and denitrification performance. Therefore, the main anoxic section of the synchronous nitrogen and phosphorus removal system can be designed and operated as reactors in series. Full article
(This article belongs to the Special Issue Physical Treatment of Municipal Sewage and Drinking Water)
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Review

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15 pages, 1853 KiB  
Review
Preparation, Properties, and Application of Biochar for Improving Sewage Sludge Dewatering Performance: A Review
by Huan Deng, Hongyan Wei, Lizhu Chen, Shujie Li, Hongxu Liu and Hai Lu
Water 2023, 15(9), 1796; https://doi.org/10.3390/w15091796 - 8 May 2023
Cited by 5 | Viewed by 2985
Abstract
Biochar is a widely available carbon-based material that has been used for soil remediation and sewage treatment. However, in recent years, biochar has received more attention as a conditioning agent to improve the dewatering performance of sewage sludge. The sludge from the secondary [...] Read more.
Biochar is a widely available carbon-based material that has been used for soil remediation and sewage treatment. However, in recent years, biochar has received more attention as a conditioning agent to improve the dewatering performance of sewage sludge. The sludge from the secondary sedimentation tank of wastewater treatment plants has high microbial activity and poor dewatering performance, which poses a challenge to sludge dehydration. Biochar and modified biochar can be injected into sludge as a skeleton to effectively reduce sludge compressibility, increase permeability, and release bound water, thus improving the dewatering performance of sludge. In this review, the preparation and characteristics of biochar are described, the current methods of sludge dewatering and the properties of sludge are introduced, and the research on the application of biochar in sludge conditioning is summarized. In addition, the existing problems and future development directions of biochar in sludge conditioning are discussed. Full article
(This article belongs to the Special Issue Physical Treatment of Municipal Sewage and Drinking Water)
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