原始名称记载: ORGANO CORPORATION

Provided is a method for producing a slime-suppressing auxiliary agent which is for a reverse osmosis membrane and which contains an iodide and suppresses the release of iodine. This method for producing a slime-suppressing auxiliary agent for a reverse osmosis membrane includes adding an iodide and an alkali agent to water having a free chlorine concentration of 0.2 mg/L or less.

A wastewater treatment apparatus included: a reaction tank which performs biological treatment of raw water, which is organic wastewater; an adding device that adds a nutrient substance to the raw water; a meter that measures the concentration of at least a volatile organic compound in gas released from water in the reaction tank; and a control device for controlling an additive amount of the nutrient substance by the adding device based on a measured value of the concentration obtained by the meter.