Improvements in stream ammonia models by simultaneous computation of extremes in flow and water chemistry

Article Abstract:

A total of 12 different sites in Colorado were studied to determine the relationship between critical combinations of pH and temperature and critical low flows. The results showed that there is no strong relationship between low flow and a high percentage of un-ionized ammonia. This suggests that existing ammonia control requirements for point source discharges are based on an erroneous assumption and may be overly stringent.

Hydrogen-ion concentration

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Nitrous oxide emissions from municipal wastewater treatment

Article Abstract:

In-system nitrous oxide (N2O) emissions from a municipal wastewater treatment system were measured in a Durham, NH, facility. Bacterially mediated denitrification has emerged as the primary factor for N2O production in such a system. N2O is produced in both high and low areas of oxygen demand. The denitrification process is characterized by anaerobic conditions and low oxygen partial pressure.

Nitrous oxide, Water reuse

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Bile acids as a new class of sewage pollution indicator

Article Abstract:

Bile acids can serve as new indicators of specific sources of sewage pollution especially when used with coprostanol. Their persistence, which is often in characteristic distribution that reveals their predominantly human origin, indicate their usefulness as sewage pollution indicators. Moreover, bile acids appear to be more resistant to degradation during sewage treatment than coprostanol.

Administration of Air and Water Resource and Solid Waste Management Programs, Pesticide and Other Agricultural Chemical Manufacturing, Agricultural chemicals, not elsewhere classified, Herbicides, Water Pollution R&D, Bile acids, Water pollution research, Indicators (Biology), Biological indicators

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