Abstract: An object is to provide a degrading bacteria-immobilized carrier on which a 1,4-dioxane-degrading bacterium is supported, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier. As a means for achieving the object, a degrading bacteria-immobilized carrier comprising a porous carrier and a 1,4-dioxane-degrading bacterium supported on the porous carrier, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier, are provided.

Abstract: Provided is a sterilization method for a water system, the sterilization method being capable of suppressing the production amount of a nitrosamine compound while exhibiting a sufficient sterilization effect in precursor-containing water that contains a nitrosamine compound precursor. In the sterilization method for a water system, a stabilizing composition containing a bromine-based oxidizing agent or a chlorine-based oxidizing agent and a sulfamic acid compound is added to the precursor-containing water that contains the nitrosamine compound precursor.

Abstract: An object is to provide a degrading bacteria-immobilized carrier on which a 1,4-dioxane-degrading bacterium is supported, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier. As a means for achieving the object, a degrading bacteria-immobilized carrier comprising a porous carrier and a 1,4-dioxane-degrading bacterium supported on the porous carrier, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier, are provided.

Abstract: Provided is a method for forming aerobic granules in which a semibatch reactor for forming granules is used, the method involving repeatedly carrying out an inflowing step for causing organic-matter-containing wastewater that includes organic matter to flow in, a biological treatment step for biologically treating substances to be treated in the organic-matter-containing drainage water by using microbial sludge, a settling step for allowing the microbial sludge to settle out, and a discharge step for discharging biologically treated water which has been biologically treated, wherein the reaction time is adjusted such that the value obtained by dividing the total cycle time by the reaction time and multiplying the resulting quotient by the ratio of the MLSS concentration to the BOD load charged into the semibatch reactor is within a range of 0.05 to 0.25 kgBOD/kgMLSS/d, and the sludge is drawn such that the sludge retention period is 5 to 25 days.

Abstract: A granule-forming method using a semi-batch reaction tank, wherein: operation cycles of a first operation cycle for performing a biological treatment step at a first sludge load and after the first operation cycle, a second operation cycle for performing the biological treatment step at a second sludge load are performed repeatedly; the first sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the first operation cycle does not decrease to a threshold value or less; and the second sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the second operation cycle is at or below the threshold value.

Abstract: A granule-forming method using a semi-batch reaction tank, wherein: operation cycles of a first operation cycle for performing a biological treatment step at a first sludge load and after the first operation cycle, a second operation cycle for performing the biological treatment step at a second sludge load are performed repeatedly; the first sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the first operation cycle does not decrease to a threshold value or less; and the second sludge load is set so that the soluble BOD concentration in the semi-batch reaction tank at the time of completion of the biological treatment step of the second operation cycle is at or below the threshold value.

Abstract: Provided is a method for forming aerobic granules in which a semibatch reactor for forming granules is used, the method involving repeatedly carrying out an inflowing step for causing organic-matter-containing wastewater that includes organic matter to flow in, a biological treatment step for biologically treating substances to be treated in the organic-matter-containing drainage water by using microbial sludge, a settling step for allowing the microbial sludge to settle out, and a discharge step for discharging biologically treated water which has been biologically treated, wherein the reaction time is adjusted such that the value obtained by dividing the total cycle time by the reaction time and multiplying the resulting quotient by the ratio of the MLSS concentration to the BOD load charged into the semibatch reactor is within a range of 0.05 to 0.25 kgBOD/kgMLSS/d, and the sludge is drawn such that the sludge retention period is 5 to 25 days.

Abstract: A unidirectional relay device includes a first port that receives communication data from one network, a first physical layer circuit that performs a protocol process of a physical layer, a first MAC layer circuit that performs a protocol process of a MAC layer, a second MAC layer circuit that is connected to the first MAC layer circuit through a signal line to perform a protocol process of a MAC layer, a second physical layer circuit that performs a protocol process of a physical layer, and a second port that transmits communication data to the other network. The signal line is a signal line that transmits data unidirectionally to the second MAC layer circuit from the first MAC layer circuit, and a signal line for transmitting data from the second MAC layer circuit to the first MAC layer circuit is opened or is connected to a ground.

Abstract: A cable and a cable stripping method which facilities the stripping of an intermediate part of a cable having a cable core covered by a plastic sheath provided around the outer periphery without damaging the cable core. In a cable having a plastic sheath 2 on a cable core 1, either a groove 2a is provided in the inner surface of the plastic sheath 2 extending in the longitudinal direction of the cable. A ripcord 3 is either fitted in the groove 2a or adhered to the inner surface of the plastic sheath. In either case, the position-indicating means 2b showing the position of the ripcord is provided on the outer surface of the plastic sheath 2 at the point where the ripcord 3 is fitted.

Abstract: A cable and a cable stripping method which facilitates the stripping of an intermediate part of a cable comprising a cable core covered by a plastic sheath provided around the outer periphery without damaging the cable core. In a cable having a plastic sheath 2 on a cable core 1, either a groove 2a is provided in the inner surface of the plastic sheath 2 extending in the longitudinal direction of the cable and a ripcord 3 is fitted in the groove 2a or a ripcord 3 is adhered to the inner surface of the plastic sheath, and in either case the position-indicating means 2b showing the position of the ripcord is provided on the outer surface of the plastic sheath 2 at the point where the ripcord 3 is fitted.

Abstract: In a method of manufacturing a self-support optical cable, a support wire and an optical cable body arranged in parallel are fed with each other; a sheath into an eight figure shape is extruded by an extruder to collectively coat the outer circumferences of the support wire and the optical cable body with the sheath, and thereafter, the self-support optical cable is cooled before hardening while the cable passes through a plurality of guide wheels so that an excess length is given to the optical cable body.

Abstract: An apparatus for biological treatment of water in which a water containing organic matter (e.g. waste water, recovered water, or untreated water in water treatment works) is biologically treated to decompose and remove the organic matter, which apparatus comprises a formed material comprising a felt-like activated carbon fiber cloth, accomodated in the treatment vessel as a packing medium, which has a ratio of surface area (cm.sup.2) of felt-like activated carbon fiber cloth to effective volume (cm.sup.3) of the treatment vessel, of 0.5-50 cm.sup.2 /cm.sup.3, and which is arranged so that the cloth surface is vertical and the cloth-to-cloth distance is 0.5-2.0 cm, thereby shortening the rise time from operation start to stable operation, and efficiently operating over a long period of time.