Abstract: An aerobic biological treatment apparatus includes a reaction tank (tank body), a water permeation plate horizontally installed in a lower part of the reaction tank, a large-diameter particle layer formed on an upper side of the water permeation plate, a small-diameter particle layer formed on an upper side of the large-diameter particle layer, an oxygen dissolution membrane module disposed on an upper side of the small-diameter particle layer, a receiving chamber formed on a lower side of the water permeation plate, a raw water dispersion pipe supplying raw water into the receiving chamber, a diffuser pipe installed to perform gas diffusion in the receiving chamber and the like. A condensed water drainage pipe branches from an exhaust pipe from the oxygen dissolution membrane module, and a valve is provided.

Abstract: Oxygen permeable membrane modules are provided in a reactor in multiple stages. An oxygen-containing gas from a blower B is sequentially circulated through the oxygen permeable membrane modules via pipes and is discharged from a pipe. Raw water flows out into a bottom part of the reactor through a plurality of nozzles, and a fluidized bed F of a biological carrier such as activated carbon is formed inside the reactor. Treated water flows out of a trough via an outflow port.

Abstract: An aerobic biological treatment apparatus includes a reaction tank (tank body), a water permeation plate horizontally installed in a lower part of the reaction tank, a large-diameter particle layer formed on an upper side of the water permeation plate, a small-diameter particle layer formed on an upper side of the large-diameter particle layer, an oxygen dissolution membrane module disposed on an upper side of the small-diameter particle layer, a receiving chamber formed on a lower side of the water permeation plate, a raw water dispersion pipe supplying raw water into the receiving chamber, a diffuser pipe installed to perform gas diffusion in the receiving chamber and the like. A condensed water drainage pipe branches from an exhaust pipe from the oxygen dissolution membrane module, and a valve is provided.

Abstract: Oxygen permeable membrane modules are provided in a reactor in multiple stages. An oxygen-containing gas from a blower B is sequentially circulated through the oxygen permeable membrane modules via pipes and is discharged from a pipe. Raw water flows out into a bottom part of the reactor through a plurality of nozzles, and a fluidized bed F of a biological carrier such as activated carbon is formed inside the reactor. Treated water flows out of a trough via an outflow port.

Abstract: Provided is an aerobic biological treatment method for treating water to be treated with aerobic organisms by dissolving oxygen in the water to be treated within a reaction tank using an oxygen dissolution membrane module disposed in the reaction tank, wherein a bioadhesive carrier within the reaction tank is suspended or fluidized to prevent adhesion of organisms to the oxygen dissolution membrane module.

Abstract: A ships' ballast water treatment agent is obtained by blending phosphate and sodium hydroxide into a hypochlorite solution and has pH of 10 to 13. A blending amount of phosphate is preferably such that a weight ratio of effective chlorine to phosphate acid (PO4) (effective chlorine:phosphate acid) is 30:1 to 2:1. A ships' ballast water treatment agent as such has excellent performance in killing bacteria and microorganisms, such as plankton, included in ships' ballast water and has stability and an anticorrosion property.

Abstract: Provided is a method for producing a feed additive raw material that can be used as a raw material of a feed additive for improving the palatability of feed and is capable of stably culturing animalcules containing a large amount of amino acids. A method for producing a feed additive raw material, comprising: a first biological treatment step of preparing a first biologically treated liquid containing dispersible bacteria by introducing an organic wastewater containing 40 wt % or more of protein to a first biological treatment tank and performing aerobic biological treatment with bacteria; a second biological treatment step of preparing a second biologically treated liquid by introducing the first biologically treated liquid to a second biological treatment tank and performing activated sludge treatment; and a sludge separation step of taking out part of the tank sludge from the second biological treatment tank as the feed additive raw material.

Abstract: Provided are an inexpensive feed additive including a metazoan animal as a feeding stimulant, and a mixed feed including the additive. The feed additive contains a metazoan animal or an aerobically biotreated sludge containing a metazoan animal. The content of the metazoan animal in the feed additive is 1 wt % or more on dry basis, and the content of a free amino acid in the feed additive is 0.5 wt % or more on dry basis. The metazoan animal is preferably based on rotifers. The mixed feed includes the feed additive and a feedstuff with the content of the feed additive of 0.1 to 30 wt % on dry basis.

Abstract: A ships' ballast water treatment agent is obtained by blending phosphate and sodium hydroxide into a hypochlorite solution and has pH of 10 to 13. A blending amount of phosphate is preferably such that a weight ratio of effective chlorine to phosphate acid (PO4) (effective chlorine:phosphate acid) is 30:1 to 2:1. A ships' ballast water treatment agent as such has excellent performance in killing bacteria and microorganisms, such as plankton, included in ships' ballast water and has stability and an anticorrosion property.

Abstract: In a water treatment method, raw water supplied from a water supply reservoir for reserving the raw water is biologically treated by a biological treatment means before being supplied to a primary pure water apparatus. Thereafter, urea or a urea derivative and/or an ammoniacal nitrogen source (NH3—N) are added before the biological treatment means. In such a treatment flow, it is preferred that a reduction treatment means is provided after the biological treatment means and before the primary pure water apparatus. According to the water treatment method, the TOC, in particular urea, in the raw water can highly be decomposed.