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Related Concept Videos

Quality of Water01:19

Quality of Water

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
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Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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Differences in dissolved organic matter between reclaimed water source and drinking water source.

Hong-Ying Hu1, Ye Du1, Qian-Yuan Wu1

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Summary

Dissolved organic matter (DOM) in reclaimed water poses greater risks than in drinking water sources. Reclaimed water DOM has higher concentrations and forms more disinfection byproducts, requiring careful treatment before blending.

Keywords:
Assimilable organic carbonDisinfection byproductsDissolved organic matterDrinking waterReclaimed water

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Area of Science:

  • Environmental Chemistry
  • Water Quality Management
  • Public Health

Background:

  • Dissolved organic matter (DOM) critically impacts drinking and reclaimed water quality.
  • Reclaimed water potable reuse is increasingly vital for augmenting water supplies globally.
  • Understanding DOM differences between drinking water sources (dDOM) and reclaimed water sources (rDOM) is crucial for safe water blending.

Purpose of the Study:

  • To compare the composition, transformation, and potential risks of dDOM and rDOM.
  • To evaluate the implications of DOM characteristics on water treatment and safety.
  • To assess the formation of disinfection byproducts (DBPs) and biotoxicity.

Main Methods:

  • Comparative analysis of DOM composition (aromaticity, fractions, molecular weight).
  • Assessment of disinfection byproduct formation potential (SDBPFP, THMs, HAAs) during chlorination.
  • Evaluation of assimilable organic carbon (AOC) and biotoxicity (genotoxicity, endocrine disruption).

Main Results:

  • rDOM showed higher dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) but lower aromaticity than dDOM.
  • rDOM contained more hydrophilic and low-molecular weight compounds, challenging removal during coagulation.
  • rDOM formed more total DBPs and exhibited higher absolute AOC and biotoxicity, despite lower specific AOC and SDBPFP.

Conclusions:

  • Reclaimed water DOM presents a greater potential risk than drinking water DOM due to higher contaminant load and toxicity.
  • The characteristics of rDOM necessitate careful treatment strategies when blending with drinking water sources.
  • Effective management of rDOM is essential to ensure the safety and quality of potable reuse water.