Sewer and Tank Sediment Flushing: Case Studies

摘要

The objective of the report summarized here is to demonstrate that sewer system211u001eand storage tank flushing that reduces sediment deposition and accumulation is of 211u001eprime importance to optimizing performance, maintaining structural integrity, and 211u001eminimizing pollution of receiving waters. Results were based on the evaluation of 211u001e18 Europe and North American installations for cleaning accumulated sludge and 211u001edebris in storm sewer (SW), combined sewer (CS), and CS overflow (CSO) storage 211u001etanks. Sewage solids deposited in CS and SW systems during dry weather are major 211u001econtributions to the wet weather-pollution load. Innovative methods for cleaning 211u001eaccumulated sediments in CSO and SW systems and storage tanks have emerged by 211u001ecreating high speed flushing waves to resuspend deposited sediments. The aim of 211u001eflushing is to wash the resuspended sediments to a storage sump which will allow 211u001elater removal of the stored contents or to the wastewater treatment plant (WWTP).