Pro: High removal in a ...
Published by jeremy dudley, Senior engineer at WRc plc
Pro:
High removal in a small footprint.
Cost-effective way to upgrade an existing plant
Cost-effective on sites that have footprint issues, such as coastal sites
May enhance the removal of suspended solids
Con:
May perform badly if flows exceed design maximum
Will perform badly if sludge blanket is allowed to get high and enter tubes
Tubes may break
Tube less easy to clean than plates, if they get fouled
UK experience is that they require regular cleaning, so may impose greater operational cost
Shorter life than conventional concrete-based settling tanks
Typically produce larger volumes of sludge, with lower DS, than conventional systems