PROBLEM TO BE SOLVED: To provide a water purification method which improves the removal efficiency of suspended solids, and a foam separation apparatus using the method which can improve the removal efficiency of suspended solids and reduce cost.SOLUTION: In the water purification method, a bubble supply part generates gas-liquid mixed water containing a large amount of fine bubbles in water to be purified, under pressure, a suspended solids-adsorbing part expands the bubbles and makes foams by adsorbing the suspended solids on a large amount of the bubbles whose surface area has been increased, and a foam removal part generates further large stable foams to discharge them outside the apparatus. The foam separation apparatus comprises a water conveying pump, a self-air feeding ejector with a Venturi tube, an air supply pipe, a screw blade attached to the inside of a water pipe, a cylindrical initial reaction vessel with no lid, having an inside diameter 2-4 times the bore of the water pipe, and a foam separation vessel incorporating the initial reaction vessel, being larger and deeper than the initial reaction vessel, and opening at the top narrowed in the form of a funnel, and a water level regulating tank.COPYRIGHT: (C)2009,JPO&INPIT【課題】懸濁物の除去効率を高めた水の浄化方法とその方法に用いる装置で、懸濁物の除去効率を向上させ、コストを低減できる泡沫分離装置の提供。【解決手段】気泡供給部では浄化対象水中に加圧下で微細な気泡を多量に含む気液混合水を生成し、懸濁物吸着部では気泡を膨脹させ、表面積を大きくした多量の気泡に懸濁物を吸着させて泡沫化し、泡沫除去部ではさらに大きな安定泡沫を形成させて装置外へ排出する水の浄化方法。送水ポンプと、ベンチュリ管を備えた空気自吸式のイジェクターと、空気供給管と、送水管内に取り付けてある螺旋状の羽根と、送水管の口径の2~4倍の内径を有する蓋のない円筒状の初期反応槽と、初期反応槽を内蔵してあり、初期反応槽よりも大きくて深く、最上部を漏斗状に狭めて開口してある泡沫分離槽と、水位調整槽とを備えた泡沫分離装置。【選択図】 図1
