Abstract: An organic wastewater treatment apparatus for biologically treating nitrogen-containing organic wastewater in activated sludge includes: a biological treatment tank at least including an anoxic tank and an aerobic tank, the aerobic tank having a membrane separator immersed in activated sludge therein, the membrane separator being configured to repeat a filtration operation and a filtration pause; a sludge return path configured to return activated sludge from the aerobic tank to the anoxic tank; an air release pipe provided to the aerobic tank; and a switching mechanism configured to switch between supplying air to an aerator provided to the membrane separator and supplying air to the air release pipe. The apparatus is configured to, based on a DO value of the aerobic tank, supply air selectively either to the air release pipe or to the aerator via the switching mechanism during a filtration pause of the membrane separator.

Abstract: A management method for a water treatment device that serves as a management method for water treatment equipment provided with a plurality of water treatment devices on each of which a plurality of water treatment members is mounted includes performing life expectancy estimation processing to estimate a life expectancy of each water treatment member based on history information of each water treatment member, the history information being updatable as needed, and performing external life expectancy homogenization processing to replace corresponding water treatment members with each other among a plurality of water treatment devices at a predetermined period so that other water treatment members each having a life expectancy within a predetermined range with respect to the life expectancy of each water treatment member estimated in the life expectancy estimation processing are mounted in an identical water treatment device.

Abstract: A history management method for water treatment members includes: a first step of, during a shipping process of placing each water treatment member in the accommodating member, registering each water treatment member identification information in the information recording section of an information management device in association with accommodating member identification information for the accommodating member and attaching, to the accommodating member, a tag from which the accommodating member identification information is readable; and a second step of, during a receiving process of attaching each water treatment member accommodated in the accommodating member to the water treatment apparatus, registering the water treatment member identification information, which is obtained from the information recording section based on the accommodating member identification information read from the tag, in the information recording section in association with water treatment apparatus identification information for t

Abstract: A water treatment method treats raw water (water to be treated) containing organic wastewater. The method includes (i) an aeration process performs an initial absorption treatment by aerating the water to be treated, (ii) a filtration process for filtering the water to be treated which has been treated by the initial absorption treatment in the aeration process, (iii) a digestion treatment process for digesting solids captured by the filtration process, (iv) a biological treatment process for denitrifying, with activated sludge, filtered water obtained through the filtration process, (v) a sludge transfer process for sending the activated sludge from the biological treatment process to the aeration process, and (vi) an adjustment process for adjusting an amount of the activated sludge sent to the aeration process via the sludge transfer process based on a nitrogen concentration of treated water which has been biologically treated by the biological treatment process.

Abstract: An organic wastewater treatment apparatus biologically treats organic wastewater containing nitrogen using a treatment tank storing activated sludge. A top-bottom partition member divides the treatment tank in into an upper space and a lower space. A plurality of anoxic tanks are formed in the lower space, while a plurality of aerobic tanks, each of which having an immersion-type membrane separation device, are formed in the upper space. A raw water supply path divides and supplies the organic wastewater to each anoxic tank. A plurality of denitrifying liquid transfer paths repeatedly transfers the activated sludge from the anoxic tanks to the aerobic tanks, while a plurality of nitrifying liquid transfer paths repeatedly transfer the activated sludge from the aerobic tanks to the anoxic tanks, whereby the activated sludge is circulated throughout the treatment tank.

Abstract: An organic wastewater treatment apparatus is operated by switching between a first operation mode and a second operation mode. The first operation mode includes supplying organic wastewater to a dual-use tank and performing an anaerobic treatment process therein, performing a nitrification-denitrification process in a membrane bioreactor treatment tank, and extracting membrane-permeated water from a membrane separation device arranged in the membrane bioreactor treatment tank as treated water.

Abstract: An organic wastewater treatment device includes a biological treatment tank having a plurality of biological treatment units connected in series, where each biological treatment unit includes a pair of an anoxic tank disposed on an upstream side and an aerobic tank disposed on a downstream side along a flow of the organic wastewater, where a membrane separation device is immersed in activated sludge in the aerobic tank, a sludge return path from the aerobic tank on the most downstream side to the anoxic tank on the most upstream side, and an anaerobic tank for anaerobically treating the organic wastewater, which is then divided and supplied to the anoxic tank of each biological treatment unit. By repeating the denitrification in the anoxic tank and the nitrification in the aerobic tank. The membrane-permeated liquid from the membrane separation device in each biological treatment unit is discharged as treated water.