WASTEWATER TREATMENT APPARATUS, WASTEWATER TREATMENT METHOD, WASTEWATER TREATMENT SYSTEM, CONTROL DEVICE, AND CONTROL METHOD

摘要

A wastewater treatment apparatus includes an air diffusing unit, a denitrification confirming unit, a nitrification confirming unit, a gas supply-amount control unit. The air diffusing unit supplies gas to nitrogen-containing water. The denitrification confirming unit provided at a first predetermined position confirms a denitrification state whether a desired proportion of the nitrate has been denitrified. The nitrification confirming unit provided at a second predetermined position confirms a nitrification state whether a desired proportion of the ammonia has been nitrified. The gas supply-amount control unit controls a gas supply amount at least on an upstream side of the denitrification confirming unit, so that the desired proportion of the nitrate is denitrified at the first predetermined position, and controls the gas supply amount at least on an upstream side of the nitrification confirming unit, so that the desired proportion of the ammonia is nitrified at the second predetermined position.

主权项

1. A wastewater treatment apparatus comprising:
an air diffusing unit that supplies gas to nitrogen-containing water throughout substantially a whole area in a flow direction of the nitrogen-containing water, so that ammonia contained in the nitrogen-containing water is nitrified to nitrate according to a flow of the nitrogen-containing water in a reaction tank, and each desired proportion of nitrate is denitrified at each position along the flow direction; a denitrification confirming unit provided at a first predetermined position along the flow direction of the nitrogen-containing water between an upstream-side denitrification zone for obtaining a requisite minimum denitrified nitrogen amount and a downstream-side nitrification zone for obtaining ultimately required nitrified water quality, which follows the upstream-side denitrification zone on a downstream side thereof, to confirm a denitrification state whether a desired proportion of the nitrate has been denitrified at the first predetermined position; a nitrification confirming unit provided at a second predetermined position, which is on a downstream side in the downstream-side nitrification zone, to confirm a nitrification state whether a desired proportion of the ammonia has been nitrified at the second predetermined position; and a gas supply-amount control unit that controls a gas supply amount from the air diffusing unit at least on an upstream side of the denitrification confirming unit along the flow direction of the nitrogen-containing water, so that the desired proportion of the nitrate is denitrified at the first predetermined position based on the denitrification state confirmed by the denitrification confirming unit, and controls the gas supply amount from the air diffusing unit at least on an upstream side of the nitrification confirming unit along the flow direction of the nitrogen-containing water, so that the desired proportion of the ammonia is nitrified at the second predetermined position based on the nitrification state confirmed by the nitrification confirming unit.