Chlorination Dynamics in Wastewater Effluents
Chlorine was found to be a very rapid acting disinfectant. Eight milligrams per liter of chlorine decreased the coliform count of wastewater effluents to less than 100 per 100 ml in some...

Hydrolysis of Lipids in Wastewater
Colloidal and supracolloidal lipid materials (grease) constitute an abundant, high-energy food source in biological wastewater treatment processes. Biochemical oxidation of these materials...

Probabilistic Variations in Ultimate First Stage BOD
Variations in the ultimate first stage BOD are found to be lognormally distributed under the hypothesis that the bacterial oxidation of organic matter is a first order reaction, and that...

Control of Bacterial Growths in Rapid Sand Filters
Nitrification has been observed in the rapid sand filters of many iron removal plants in Illinois. The biological oxidation of ammonia to nitrate by nitrifying organisms often results...

Peat and Muck Drainage Problems
Drainage of organic soils results in lowering of the surface (subsidence) by shrinkage due to drying, loss of the bouyant force of groundwater, compaction, wind erosion, burning, and biochemical...

Energy Concepts of Aerobic Microbial Metabolism
Three different energy concepts of cell yield are investigated using synthesis data measured in mixed aerobic cultures for 15 different substrates. These include, the energy-synthesis...

Predicting DO Variations Caused by Algae
Eutrophic environments are often dominated by planktonic algal populations (phytoplankton) which can cause diurnal variations in DO concentrations through respiratory activity and photosynthesis....

Evaluation of Nitrification in Streams
A simplified procedure for evaluating nitrification progression in a stream is given. Data are presented for the Clinton River between Pontiac and Rochester, Mich, which shows rapid inorganic...

Water Quality Analysis of the Delaware River Estuary
A mathematical model is developed for the Delaware River Estuary between Trenton and Reedy Island. The model provides a satisfactory engineering tool to assess the efficacy of various...

Filed Tests on Chlorination of Poliovirus in Sewage
Full-scale field tests on the chlorination of poliovirus in sewage were conducted using the effluent at a small trickling filter plant. A vaccine strain of poliovirus was taken as a model...

River and Laboratory BOD Rate Considerations
Differences observed between the laboratory bottle BOD rate, k1, and the river BOD rate, kr, motivated an...

Effects of CO2 and N2 on Anaerobic Digestion
Various agitation schemes used in digester operation have led to the possibility that carbon dioxide levels may have an effect on digester efficiency. Three digesters were set up in the...

Dichromate Versus Ceric Sulphate in COD Determinations
The oxidizing powers of dichromate and ceric sulphate are investigated with various catalysts. The study includes 32 pure organic compounds of various chemical structures. The highest...

Oxidation of Coal Mine Pyrite
The process of pyrite and marcasite decomposition as it occurs in coal mining regions is described as an electrochemical process analogous to the corrosion of iron. The polymorphic minerals,...

Survival of S. Typhi in Sewage Oxidation Ponds
Tests indicate that Salmonella typhi survive for longer periods in anaerobic than in facultative lagoons. Laboratory tests on the survival of Salmonella typhi were made in several columns,...

An Oxidation Pond as a Tertiary Treatment Device
Tertiary treatment is becoming necessary to effect greater removal of BOD, solids, and coliform organisms from the effluents of conventional secondary wastewater treatment facilities....

Evaluation of Two Aerated Lagoons
Field studies of two aerated lagoons treating domestic sewage over a 2-yr period yielded 63% BOD reduction with 1.7 days aeration and 78% BOD reduction with 7.1 days aeration. The use...

Free Energy as a Parameter in Biological Treatment
A basic approach to the problem of activated sludge synthesis and substrate oxidation has been taken by using the thermodynamic concept that free energy change is a measure of the maximum...

Oxygen Balance of an Estuary
Field data from estuarine surveys of Delaware and James Rivers; net seaward movement of organic impurities is due to displacement by land runoff and to longitudinal diffusion of tidal...

Oxygen Balance of an Estuary
Field data from estuarine surveys of Delaware and James Rivers; net seaward movement of organic impurities is due to displacement by land runoff and to longitudinal diffusion of tidal...

 

 

 

 

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