In-Stream Deoxygenation Rate Prediction
Empirical relationships have been derived relating the stream deoxygenation rate, Kd, to indices relevant to stream hydraulic geometry. The data base was developed from available literature...

Secondary Treatment Alternatives: Suspended Growth
The modifications of conventional activated sludge capable of producing secondary effluent when followed by properly designed sedimentation units include extended aeration, oxidation ditches,...

Removal of Soluble Secondary-Effluent Organics
Data are presented on the removal of soluble organic nitrogen (SON) and soluble chemical oxygen demand (SCOD) by chemical coagulation, activated-carbon adsorption, ion exchange, lime precipitation,...

Mathematical Modeling of Dissolved Oxygen in Mixed Estuaries
One of the basic difficulties in modelling DO in a given estuary is the uncertainities involved in the BOD and reaeration rates. The oxidation of both carbonaceous and nitrogenous substances...

BOD Test Variables
It has been reported that the oxidation rate in a stream is higher than the corresponding rate obtained from the laboratory BOD test. This study was undertaken to observe the effect of...

Kinetics of Bacterial Deactivation with Chlorine
A power function relating coliform bacteria deactivation to the product of the chlorine contact time, t, and the initial chlorine residual concentration, R, is applied to disinfection...

European Water Treatment Practices — Their Experience with Ozone
Today, more than 1100 water treatment plants worldwide use ozone for some purpose. In Europe, it is always regarded as a water-treatment technique and seldom simply as a disinfectant....

Evaluation of the Nitrogen-Related Deoxygenation Process in a Polluted Water

Ozone Effect on Nitrogenous Matter in Effluents
A study of the effect of ozone on various nitrogenous compounds found in effluents was undertaken using two systems: (1)Effluents after lime treatment; and (2)solutions of specific nitrogenous...

Nitrifying Organism Concentration and Activity
A technique for estimating the concentration and activity of nitrifying microorganisms was developed. The oxidation rates of the nitrifying organisms were not affected by substrate concentration...

Dye Catalyzed Oxidation of Industrial Wastes
Dye sensitized aerobic photooxidation is a photochemical process by which a sensitizer dye absorbs visible light energy and transfers it to dissolved oxygen to form singlet oxygen. Singlet...

Proposed Design for Oxidation Ponds in Hot Climates
The proper collection, treatment, and disposal of domestic wastewaters is of vital importance in hot climates, particularly in those tropical developing countries where water-related diseases...

Physicochemical Properties of Dredge Spoil
Physicochemical changes resulting from the subaerial exposure of dredge spoil during land disposal were investigated using five fine-grain bottom sediment samples from the lower Great...

Oxygen Transfer at High Solids Concentrations
Oxygen transfer relationships have not been well defined for mixed liquors with high solids concentrations. This study evaluated the ability of a cage rotor to transfer oxygen in an operating...

Simulation of Water Quality in Tarawera River
The Tarawera River, New Zealand, receives effluent from two paper and pulp mills and exhibits a very high rate of deoxygenation. Attempts have been made to predict water quality in the...

Effect of Suspended Wastes on System Design
The optimum degree of primary treatment in an activated sludge process is investigated in this study. In this investigation, a so-called parallel biochemical oxidation kinetic model, which...

Oxidation and Heave of Black Shale
Heave of floor slabs and lightly loaded structures founded on black, pyritic shales has been a severe engineering problem in several places in the world. The geochemical processes responsible...

Effects of Iron on Activated Sludge Treatment
The importance of inorganic nutrients on activated sludge treatment has not been emphasized or studied extensively. Studies of the fundamentals of inorganic ions have been limited to nitrogen...

Effects of Dispersion on DO-Sag in Uniform Flow
Dispersion is found to have little effect on steady DO-sag. With periodic supply of BOD at outfall, the amplitude of fluctuations may be significantly reduced along stream by dispersion....

Oxidation of Sulfide by O2: Catalysis and Inhibition
Reaction rates between sulfide and oxygen in the presence of extraneous substances were studied. Divalent metal ions and organic substances such as phenols and aldehydes were found to...

 

 

 

 

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