Report No FR0090

DESIGN GUIDELINES FOR ACTIVATED SLUDGE PROCESS

FR0090

Apr 1990

SUMMARY

I OBJECTIVES

To produce a report describing the present state of knowledge on the causes and control of activated sludge bulking.

This report is intended to form part of the manual on activated sludge systems.

II REASONS

WRc has completed a wide range of research projects on activated sludge systems over a number of years. The results have led to an increased understanding of the process. Full-scale application of recent developments will be greatly facilitated by the production of a comprehensive set of design guidelines in the form of a manual.

III RESUME OF CONTENTS

The phenomenon of sludge bulking is defined and described and options available for its control are listed. The control strategies are listed in a logical sequence with reference to the underlying causes of the problem.

Conclusions are summarised as implications for the design of new activated sludge plants and for the modification of existing systems.

A description of recent developments in research into sludge settleability is given.

Copies of the report are available from FWR, price 25.00, less 20% to FWR Members.