JP2016140838A5 - - Google Patents

Claims (11)

A wastewater treatment method in which wastewater containing organic matter is introduced into a treatment tank to perform activated sludge treatment, and the wastewater after activated sludge treatment is separated into solid and liquid by a separation membrane installed in the treatment tank, and the treated water is taken out. , Improving the clogging state of the separation membrane, measuring the clogging state of the separation membrane while predominating microorganisms belonging to the genus Bacillus, and based on the measured clogging state of the separation membrane A wastewater treatment method characterized by performing a treatment of adding an iron compound and / or a magnesium compound to wastewater to be treated with activated sludge in the treatment tank as the microorganism activation treatment.   The wastewater treatment method according to claim 1, wherein when the index indicating the clogging state of the separation membrane exceeds a predetermined threshold, the microorganisms are activated.   The indicator showing the clogged state of the separation membrane is a water pressure of treated water solid-liquid separated by the separation membrane, and when the water pressure value falls below a predetermined value, the microorganism is activated. The waste water treatment method according to 2.   The wastewater treatment method according to any one of claims 1 to 3, wherein the microorganism that improves the clogging state of the separation membrane includes a microorganism that secretes at least a proteolytic enzyme or a carbohydrate degrading enzyme to the outside of the cell.   The wastewater treatment method according to any one of claims 1 to 4, wherein the activation treatment of the microorganism is a treatment including an increase in a proteolytic enzyme and / or a carbohydrate degrading enzyme secreted by the microorganism outside the cell. The said microorganisms activation process is a waste water treatment method as described in any one of Claims 1-5 including the process which adds a silicon compound further to the waste_water | drain processed by the activated sludge in the said processing tank. The wastewater treatment method according to any one of claims 1 to 6 , wherein the state of clogging of the separation membrane is measured after backwashing or bubbling of the separation membrane. A wastewater treatment apparatus that introduces wastewater containing organic substances into a treatment tank to perform activated sludge treatment, and separates the wastewater after activated sludge treatment with a separation membrane installed in the treatment tank, and takes out the treated water. ,
A means for supplying an activator of a microorganism belonging to the genus Bacillus, which improves the clogging state of the separation membrane, and comprising at least an iron compound or a magnesium compound ;
Means for measuring the state of clogging of the separation membrane;
A wastewater treatment apparatus comprising control means for controlling the supply amount of the activator into wastewater to be treated with activated sludge in the treatment tank based on the clogged state of the measured separation membrane. . The wastewater treatment apparatus according to claim 8, wherein the microorganism that improves the clogging state of the separation membrane is a microorganism that secretes at least a proteolytic enzyme or a carbohydrate-degrading enzyme outside the cell. The waste water treatment apparatus according to claim 8 , wherein the microbial activator further contains a silicon compound. The wastewater treatment apparatus according to any one of claims 8 to 10 , wherein the means for measuring the clogged state of the separation membrane includes a means for measuring a water pressure of the treated water solid-liquid separated by the separation membrane.