Special Issue "Recycle of Drinking Water Treatment Residues"

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

Deadline for manuscript submissions: closed (4 February 2022) | Viewed by 1211

Special Issue Editor

Dr. Changhui Wang
E-Mail Website
Guest Editor
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Interests: drinking water treatment; aluminum sulfate; treatment residue; sediment-water interface; total dissolved phosphorus; organic phosphorus; dissolved organic matter; parallel factor analysis; aromaticity

Special Issue Information

Dear Colleagues,

The water treatment process used to produce safe drinking water produces a large amount of residual products, depending on the untreated water source, the chemicals used for purification, and the type of unit operation used. In the conventional coagulation-filtration process, by adding aluminum and iron salts as coagulants, suspended solids and natural organic matter are removed from the raw water, resulting in water treatment residues. The residues are often disposed of in landfill after the residue being dewatered or directly discharged into urban sewage systems or surface water (without being dewatered), both of which ether increase water treatment cost or enhance the potential risks to environment. Successful recycling of the residues would be beneficial to achieve economic cycle model.

The recycling of water treatment residues has been reported to involve in various fields, including construction industry, flocculants recovery, and especially environmental remediation. The research has greatly improved our understanding of the nature, environmental behavior, and potential uses of water treatment residues. Therefore, the research topics of this special issue include but are not limited to:

  • Current residual characteristics of water treatment;
  • Determine the potential of water treatment residues to control pollution for protection of underground water and surface water.
  • Show how water treatment residues affect microorganisms, micro-animals, insects and animals;
  • Review the negative and beneficial environmental impacts of water treatment residues in water environment remediation;
  • Determine the accumulation of much radioactivity in water treatment residues.

Dr. Changhui Wang
Guest Editor

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Keywords

  • drinking water treatment residue
  • recycle
  • environmental remediation
  • aquatic ecosystem
  • soil
  • wastewater
  • adsorption
  • phosphorus
  • nitrogen
  • metal

Published Papers (1 paper)

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Research

Article
Washing and Heat Treatment of Aluminum-Based Drinking Water Treatment Residuals to Optimize Phosphorus Sorption and Nitrogen Leaching: Considerations for Lake Restoration
Water 2021, 13(18), 2465; https://doi.org/10.3390/w13182465 - 08 Sep 2021
Cited by 1 | Viewed by 929
Abstract
Drinking water treatment residuals (DWTRs) generated during drinking water treatment have been proposed for use in lake restoration as a solid-phase sorbent to inactivate phosphorus (P) in lake sediment. However, treatments that minimize leaching of nitrogen (N) and optimize P sorption capacity may [...] Read more.
Drinking water treatment residuals (DWTRs) generated during drinking water treatment have been proposed for use in lake restoration as a solid-phase sorbent to inactivate phosphorus (P) in lake sediment. However, treatments that minimize leaching of nitrogen (N) and optimize P sorption capacity may be necessary prior to use. This study assessed seven different treatment methods, including washing and heat treatments at different temperatures and with and without oxygen limitation, among two DWTRs from Thailand. Results showed that oxygen-limited heat treatment at 600 °C substantially reduced N leaching (<0.2 mg/kg TKN) while also improving P sorption capacity (increase of 18–32% compared to untreated DWTR) to a maximum of 45.7 mg P/kg. Washing with deionized water reduced N leaching if a sufficient volume was used but did not improve P sorption. Heating at 200 °C with or without the presence of oxygen did not improve N leaching or P sorption. Regression of P sorption parameters from a two-surface Langmuir isotherm against physio-chemical properties indicated that oxalate-extractable (i.e., amorphous) aluminum and iron were significantly associated with total P sorption capacity (R2 = 0.94), but micropores and oxalate-extractable P modulated the P sorption from high-affinity to low-affinity mechanisms. In conclusion, this study confirmed the importance of amorphous aluminum in DWTRs for inactivating P, and the results suggest that high-temperature treatment under oxygen-limited conditions may be the most reliable way to optimize DWTRs for environmental remediation applications. Full article
(This article belongs to the Special Issue Recycle of Drinking Water Treatment Residues)
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