L01974 Characterization and Treatment Evaluation of Hydrostatic Test Water Effluent

This investigation of the pollution aspects of the hydrostatic test effluent concerned three separate phases: (1) the study of the existing and new 1972 water pollution laws pertinent to this type of water pollution, (2) the characterization of the hydrostatic test water effluent as a possible pollutant, and (3) evaluation of treatment methods of the hydrostatic test water prior to its return to receiving waters. It was determined that the polluting parameters of the hydrostatic test water that were significant were iron and chemical oxygen demand (COD). In new pipelines concentrations of iron and COD are low in old pipelines the iron concentration is high for the entire dewatering period and will usually, therefore, require treatment before being returned to the receiving state waters.