| untreated total | It is possible that the reporting unit (a municipal sewage-treatment plant) reports in the report OS-5 that the amount of purified municipal and rural waste water was larger than the amount of water discharged into sewage network. This can occur in the following circumstances: 1. the treatment plant receives the waste water with a separate collector from a plant or municipal/rural waste water is being discharged into a plant collector, 2. the plant collector plays the role of a sewerage network but was not acquired by the entities that run the water-sewerage network, 3. waste water is being transported into the treatment plant in vehicles, 4. the method of determining of municipal sewage discharged into the sewerage network is based on water meter readouts, and assumes that the amount of waste water is equal to the amount of water supplied and uses the information about lump amounts discharged into sewerage network. The amount of non-purified waste water is calculated as difference between the waste water flowing into the plant and the amount of purified waste water. This could result in negative values in the non-purified waste water field. |
| untreated, discharged through sewerage system | It is possible that the reporting unit (a municipal sewage-treatment plant) reports in the report OS-5 that the amount of purified municipal and rural waste water was larger than the amount of water discharged into sewage network. This can occur in the following circumstances: 1. the treatment plant receives the waste water with a separate collector from a plant or municipal/rural waste water is being discharged into a plant collector, 2. the plant collector plays the role of a sewerage network but was not acquired by the entities that run the water-sewerage network, 3. waste water is being transported into the treatment plant in vehicles, 4. the method of determining of municipal sewage discharged into the sewerage network is based on water meter readouts, and assumes that the amount of waste water is equal to the amount of water supplied and uses the information about lump amounts discharged into sewerage network. The amount of non-purified waste water is calculated as difference between the waste water flowing into the plant and the amount of purified waste water. This could result in negative values in the non-purified waste water field. |
| treated biologically, chemically and with increased biogene removal in % of wastewater requiring treatment | Chemically purified waste water - concerns only industrial waste water. |