Wastewater is domestic, municipal, or industrial liquid waste products. Depending on their origin, wastewaters can be classed as sanitary, commercial, industrial, or surface runoff.
Sanitary sewage: The spent water from residences and institutions, carrying body wastes, ablution water, food preparation wastes, laundry wastes, and other waste products of normal living, are classed as domestic or sanitary sewage.
Commercial wastes: Liquid-carried wastes from stores and service establishments serving the immediate community, termed commercial wastes, are included in the sanitary or domestic sewage category if their characteristics are similar to household flows.
Surface runoff: It is also known as storm flow or overland flow, is that portion of precipitation that runs rapidly over the ground surface to a defined channel. Precipitation absorbs gases and particulates from the atmosphere, dissolves and leaches materials from vegetation and soil, suspends matter from the land, washes spills and debris from urban streets and highways, and carries all these pollutants as wastes in its flow to a collection point. Discharges are classified as point-source when they emanate from a pipe outfall, or non-point-source when they are diffused and come from agriculture or unchanneled urban land drainage runoff.
Any sewage discharged from a vessel will be either one of the following two categories, (i) treated sewage or (ii) untreated sewage.
See the following pages in cultivation of algae in sewage:
Sanitary sewage: The spent water from residences and institutions, carrying body wastes, ablution water, food preparation wastes, laundry wastes, and other waste products of normal living, are classed as domestic or sanitary sewage.
Commercial wastes: Liquid-carried wastes from stores and service establishments serving the immediate community, termed commercial wastes, are included in the sanitary or domestic sewage category if their characteristics are similar to household flows.
Surface runoff: It is also known as storm flow or overland flow, is that portion of precipitation that runs rapidly over the ground surface to a defined channel. Precipitation absorbs gases and particulates from the atmosphere, dissolves and leaches materials from vegetation and soil, suspends matter from the land, washes spills and debris from urban streets and highways, and carries all these pollutants as wastes in its flow to a collection point. Discharges are classified as point-source when they emanate from a pipe outfall, or non-point-source when they are diffused and come from agriculture or unchanneled urban land drainage runoff.
Any sewage discharged from a vessel will be either one of the following two categories, (i) treated sewage or (ii) untreated sewage.
Treated sewage
Treated sewage is sewage that has passed through an onboard sewage treatment system and has three distinct grades, that is, Grade A, Grade B and Grade C treated sewage. Grade C is the lowest level of treatment, Grade B is a higher level of treatment and Grade A is the highest level of treatment. Macerated sewage is not treated sewage.Untreated sewage
Untreated sewage (or raw sewage) is all sewage that is not treated sewage - sewage that has not passed through a treatment system. This is sewage that is discharged directly from a toilet into a waterway (in areas where discharge is permitted) or contained in an onboard holding tank. Any untreated sewage that is discharged, in areas where the discharge of untreated sewage is permitted, must first pass through a macerator. Macerated sewage is untreated sewage.See the following pages in cultivation of algae in sewage:
