WATER TREATMENT METHOD

• Main Authors: TAKEDA MASARU, AWAI EIJI, KAWAMURA KAZUSHIGE
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2016
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a water treatment method capable of relatively easily coping with a load fluctuation, even if a processing load, such as the amount of wastewater to be treated and the concentration of oil, fluctuates during water treatment of oil-containing wastewater to be treated using an ozone-containing gas.SOLUTION: In a water treatment method, a gas containing ozone is introduced into wastewater to be treated to coagulate oil (a coagulation step 2), thereby separating the coagulated oil by floatation (a floatation separation step 3). When the oil is coagulated by the ozone, an acid is added to the wastewater to be treated. Consequently, the pH of the wastewater to be treated is adjusted so as to be decreased within a range from the pH before the acid addition to pH 3.5.SELECTED DRAWING: Figure 1 【課題】オゾン含有ガスを用いた油分を含む被処理排水の水処理に際し、当該被処理排水の水量、当該油分の濃度等の処理負荷に変動があっても、負荷の変動に比較的容易に対応可能な水処理方法を提供する。【解決手段】この水処理方法では、被処理排水に、オゾンを含むガスを導入して油分を凝集（凝集工程２）させることにより、凝集した油分を浮上分離（浮上分離工程３）させる。油分をオゾンにより凝集させる際に、被処理排水に酸を添加する。被処理排水のｐＨを、酸の添加前のｐＨからｐＨ３．５までの範囲内でｐＨが下がるように調整する。【選択図】図１