Water treatment method and water treatment apparatus

A water treatment method for treating raw water (water to be treated) containing organic wastewater, comprising:

• an aeration process including performing an initial adsorption treatment, by aerating the water to be treated in a plurality of aeration tanks;
• a filtration process including filtering the water to be treated which has been treated by the initial adsorption treatment in the aeration process;
• a digestion treatment process including digesting solids captured by the filtration process;
• a biological treatment process including denitrifying, with activated sludge, filtered water obtained through the filtration process;
• a sludge transfer process including sending the activated sludge from the biological treatment process to the aeration process;
• and
• an adjustment process including adjusting a number of the aeration tanks to which the activated sludge is sent via the sludge transfer process, based on a nitrogen concentration of treated water which has been biologically treated in the biological treatment process and has been filtered by a membrane separation device.

A water treatment method for treating raw water (water to be treated) containing organic wastewater, comprising:

• an aeration process including performing an initial adsorption treatment by aerating the water to be treated;
• a filtration process including filtering the water to be treated, which has been treated by the initial adsorption treatment in the aeration process, with a rotary filter having a rotating filtration surface;
• a digestion treatment process including digesting solids captured by the filtration process;
• a biological treatment process including denitrifying, with activated sludge, filtered water obtained through the filtration process;
• a sludge transfer process including sending the activated sludge from the biological treatment process to the aeration process;
• and
• an adjustment process including adjusting a rotation speed of the filtration surface based on a nitrogen concentration of treated water which has been biologically treated in the biological treatment process.

A water treatment apparatus for treating raw water (water to be treated) containing organic wastewater, comprising:

• an aeration device configured to perform an initial adsorption treatment by aerating the water to be treated;
• a filtration device configured to filter the water to be treated which has been treated by the initial absorption treatment in the aeration device;
• a digestion treatment device configured to digest solids captured by the filtration device;
• a biological treatment device configured to denitrify, with activated sludge, filtered water obtained though the filtration device;
• a sludge transfer device configured to send the activated sludge from the biological treatment device to the aeration device;
• and an adjustment device configured to adjust an amount of the activated sludge sent to the aeration device via the sludge transfer device, based on a nitrogen concentration of treated water that has been biologically treated by the biological treatment device and has been filtered by a membrane separation device.