Water Science & Technology

Volume 19 Number 3-4

Contents

Erratum ..........vii

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Economic and Environmental Benefits from Froth Flotation Recovery of Titanium, Zirconium, Iron and Rare Earth Minerals from Oilsand Tailings

M. T. Ityokumbul, W. Bulani and N. Kosaric ..........323–331

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Examination of the Zinc Cementation of Cadmium in Aqueous Solutions

J. P. Gould, I. B. Escovar and B. M. Khudenko ..........333–344

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Biological Treatment for Low-Activity Nuclear Wastewaters

R. Ramadori, F. Fenoglio and L. Pozzi ..........345–353

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Biodegradation of Oil on Drilled Cuttings

T. Bilstad, T. Bosdal and E. Toerneng ..........355–369

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The Fight against Industrial and Urban Pollution in the Artois - Picardie Basin

Yvon Raak ..........371–379

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Photocatalysed Oxidation of Toxic Organics

M. Brett Borup and E. Joe Middlebrooks ..........381–390

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A Study on the Use of Bipolar-Particles-Electrodes in Decolorization of Dyeing Effluents and Its Principle

Zhou Ding, Cai Wei Min and Wang Qun Hui ..........391–400

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Development of Environmental Engineering Education in Developing Countries

Shamin Ahmad ..........401–407

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Removal of Hazardous Organic Pollutants by Adsorption on Microbial Biomass

J. P. Bell and M. Tsezos ..........409–416

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Biological Decomposition of Trace Organic Compounds

M. Shibata, K. Nakamura and Y. Miyaji ..........417–427

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Chlorinated Hydrocarbons in Biological Sewage Purification — Fate and Difficulties in Balancing

H. Fr. Schröder ..........429–438

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Prediction of Soluble Nickel Removal by Activated Sludge Using Free Metal Ion Concentrations

Jeppe S. Nielsen, Steve E. Hrudey and Frederick F. Cantwell ..........439–448

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Behaviour of Alkylphenol Polyethoxylate Surfactants and of Nitrilotriacetate in Sewage Treatment

W. Giger, M. Ahel, M. Koch, H. U. Laubscher, C. Schaffner and J. Schneider ..........449–460

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Response of Phthalate Esters-Acclimated Activated Sludge to 2,4-Dinitrophenol

R. Yucel Tokuz ..........461–470

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Fate of Toxic Organic Compounds in Activated Sludge and Integrated PAC Systems

W. J. Weber, Jr., B. E. Jones and L. E. Katz ..........471–482

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Performance Evaluation of Rotating Biological Contactor Process

K. Tanaka, A. Oshima and B. E. Rittmann ..........483–494

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The Significance of Segregation of Biomass in Biofilms

W. Gujer ..........495–503

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Application of Batch Kinetic Data to the Sizing of Continuous-Flow Activated Sludge Reactors

André van Niekerk, David Jenkins and M. G. Richard ..........505–516

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A Critical Evaluation of Microbial Product Formation in Biological Processes

B. E. Rittmann, W. Bae, E. Namkung and C.-J. Lu ..........517–528

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Molecular Weight Distributions of Soluble Organic Matter in Various Secondary and Tertiary Effluents

Gary L. Amy, Curtis W. Bryant, Jr. and Mosen Belyani ..........529–538

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Reduction of Microbial Indicators and Viruses in a Cypress Strand

P. R. Scheuerman, S. R. Farrah and G. Bitton ..........539–546

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Survival of Indicator Organisms in a Detention Pond Receiving Combined Sewer Overflow

Lambertus Lijklema, Barbara Habekotté, Christine Hooijmans, Roelof H. Aalderink and Arie H. Havelaar ..........547–555

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Disinfection Efficiency and Problems Associated with Maturation Ponds

R. J. Macdonald and A. Ernst ..........557–567

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The Removal of Excreted Bacteria and Viruses in Deep Waste Stabilization Ponds in Northeast Brazil

J. I. Oragui, T. P. Curtis, S. A. Silva and D. D. Mara ..........569–573

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Waterborne Outbreaks in Sweden — Causes and Etiology

Y. Andersson and T. A. Stenström ..........575–580

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Dimensioning of Combined Sewer System Detention Basins by Long Term Simulation of Storm Water Runoff

F. Sieker and A. Durchschlag ..........581–588

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Infiltration Rates for Separate Sewage Collection Systems

J. B. Murray ..........589–601

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Maintenance Strategies for Sewerage Systems

A. S. Camara, D. Pereira, A. Fonseca and S. Sequeira ..........603–611

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Activated Sludge Settlers: Design and Optimization

P. F. C. Catunda and A. C. van Haandel ..........613–623

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Low-Cost Wastewater Treatment with the Use of an Intrachannel Clarifier in Oxidation Ditches

O. R. Vélez and J. Foil ..........625–632

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Socio-Technological Aspects of Automation in Public Works Activities

William F. Garber ..........633–643

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Oxidation-Reduction Potential (ORP) Regulation: A Way to Optimize Pollution Removal and Energy Savings in the Low Load Activated Sludge Process

J. Charpentier, M. Florentz and G. David ..........645–655

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Computer Aided Control of Nitrogen Removal in Small Activated Sludge Wastewater Treatment Plants

G. Bahre ..........657–667

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Field Verification of On-Line Instrumentation at a Municipal Wastewater Treatment Plant

Gordon W. Speirs and Robert D. Hill ..........669–680

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