摘要:
A sewage treatment system is provided, for cleaning a sewage by filtering solid components in the swage through floating filter medium, wherein the filtration performance can be improved and the filtration cleaning can be performed efficiently. The sewage 18 is flowed into the treatment tank 12 in upward-flow, and filtered through the floating filter media layer 22 made of the meshy cylindrical floating filter medium 20 which have smaller specific gravity than the sewage 18. To wash floating filter medium 20, the air is jetted from the air jetting pipe 54 and the revolution flow is generated to scale solid components adhering to filter medium, and then the sewage 18, which has washed the floating filter medium 20, are discharged to the outside of the tank 12 while the air is jetted from the air jetting pipe 56 for full jetting to jet the floating filter media layer 22 in whole.
摘要:
A battery includes a power generation element, a case member that accommodates the power generation element, and an opening closure member that closes the case member. The opening closure member includes a case contact part for contacting an elongated opening edge of the case member around an entire periphery thereof, and a case inside part projecting toward an inside of the case member from a portion of a surface of the opening closure member on the case member side internally of the case contact part. The case inside part has two narrower portions positioned at both ends of the case inside part in a longitudinal direction of the elongated opening edge of the case member and spaced from an inner surface of the side of the case member, and a wider portion positioned between the two narrower portions and contacting an inner surface of the side of the case member.
摘要:
A sewage treatment system is provided for cleaning sewage by filtering solid components in the sewage through use of a floating filter medium, wherein the filtration performance can be improved and the filtration cleaning can be performed efficiently. The sewage flows upwardly in the treatment tank and is filtered through the floating filter media layer made of cylindrical mesh floating filter media which have a smaller specific gravity than the sewage. To wash the floating filter medium, air is jetted from the air jetting pipes to generate a circular flow to scape off solid components adhering to the filter medium. Then the waste, which has washed the floating filter medium is discharged to the outside of the treatment tank while the air is jetted from the air jetting pipe for full jetting of the floating filter media layer unidirectionally.
摘要:
A system for treating waste water using a particulate body formed by covering and fixing nitrifying bacteria. In the system, the particulate body is inserted in a nitrifying vessel which including therein an air diffusion device for supplying oxygen to the nitrifying bacteria and a particulate body separation device for preventing the outflow of the particulate body. The nitrifying vessel and the particulate body contained therein are used as a nitrifying vessel unit and one or more such nitrifying vessel units are arranged within a treating tank. Waste water is circulated between the nitrifying vessel and the other portions of the treating tank than the nitrifying vessel by means of the air lift effect of the air diffused from the air diffusion device.
摘要:
Microorganisms such as in activated sludge are immobilized by forming a mixture containing the microorganisms, a monomer or prepolymer and alginic acid or water soluble alignate, and dropping the mixture into a water solution of polyvalent metal ion and a polymerization initiator to form particles containing the microorganisms. Preferably, the monomer is an acrylamide monomer, the prepolymer is an ester of an acrylic acid group and polyethylene glycol and the polymerization initiator is a persultate. By this method, the microorganisms are protected from toxic substances such as the polymerization initiator during immobilization.
摘要:
Method for gas metal arc welding of very low carbon steel in which a crack-free region where high temperature cracking does not occur is obtained by controlling the carbon content of the weld metal.