Incompleteness of wastewater dechlorination

Article Abstract:

Chlorine is widely used in many waste water treatment plants in the US as a disinfectant. However, residual chlorine poses a considerable hazard to aquatic organisms living in waters receiving effluents from such plants. To prevent this scenario, treatment plant operators have installed sulfur(IV) dechlorination equipment which can remove 87% to 98% of residual chlorine. The remaining 2% to 13%, however is reduced very slowly. This findings prove the existence of sulfur(IV)-resistant residual chlorine, indicating that many plants using dechlorination do not meet EPA standards for total chlorine.

Administration of Air and Water Resource and Solid Waste Management Programs, Other Commercial and Service Industry Machinery Manufacturing, Water Pollution Control, Service industry machinery, not elsewhere classified, Water & Waste Treatment Equip, Health aspects, Laws, regulations and rules, United States. Environmental Protection Agency, Water treatment plants

---

Rates of reduction of N-chlorinated peptides by sulfite: relevance to incomplete dechlorination of wastewaters

Article Abstract:

An evaluation of sulfite and sulfur dioxide use in wastewater treatment reveals that these chemicals require longer reaction times of more than 0.5 hours at environmentally acceptable doses and pH levels. These chemicals are often used to reduce N-chloropeptides by 75% or more to protect aquatic life. This strategy has been found to incompletely eliminate residual chlorine species.

Sewage Systems, Sewage Treatment Facilities, Sewerage systems, Sewer systems, Environmental aspects, Sewage, Disinfectants, Sulfur compounds, Chlorine and derivatives as disinfectants, Biological sewage treatment

---

Osmium isotopes demonstrate distal transport of contaminated sediments in Chesapeake Bay

Article Abstract:

Researchers from Maryland, USA, conducted a regional survey of Osmium isotopes and disclosed unanticipated anthropogenic Os sources like biomedical research institutions, notably from Baltimore, and evidence of seaward movement of Os and other contaminants flowing towards Chesapeake Bay.

United States, Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Osmium, Research, Pollution, Chesapeake Bay, Precious metals industry, Precious metal products

Similar abstracts:

• Abstracts: Influence of structural features on sorption of NOM-analogue organic acids to goethite. Competitive sorption of simple organic acids and sulfate on goethite
• Abstracts: Radionuclide bioconcentration factors and sediment partition coefficients in Arctic Seas subject to contamination from dumped nuclear waste
• Abstracts: Biotransformations of selenium oxyanion by filamentous cyanophyte-dominated mat cultured from agricultural drainage waters
• Abstracts: Concentrations of Ames mutagenic chlorohydroxyfuranones and related compounds in drinking waters. Sediment management: deciding when to intervene. (contaminated sediments in the Great Lakes Basin)
• Abstracts: East Central Europe: an environment in transition. Effect of two electron acceptors on atrazine mineralization rates in soil

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.