WASTEWATER TREATMENT APPARATUS

• Main Authors: UMEZAWA HIROYUKI, TACHIKI ETSUJI
• Format: Patent
• Language: English; Japanese
• Published: 30.03.2015
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; SEPARATION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus which recovers metals in wastewater by a simple treatment process.SOLUTION: In a wastewater treatment apparatus which recovers metals by a simple treatment process, hardly biodegradable substances contained in wastewater are degraded to easily degradable substances by air added with low-concentration ozone, the easily degradable substances are treated and metals contained in the wastewater are adsorbed and precipitated by biological treatment in a membrane separation activated sludge tank 7, and only the precipitated metal fine particles are recovered. 【課題】従来の難分解性物質の分解や貴金属の回収には、オゾンや晶析反応のための薬品を多量に使用するため、処理工程を正確に制御する必要があった。【解決手段】低濃度なオゾン添加空気により、排水に含まれる生物難分解性物質を易分解物質に分解し、膜分離活性汚泥槽７での生物処理により、易分解性物質を処理するとともに、排水に含まれる金属類を吸着析出する。更に析出した金属微粒子だけを回収することで簡単な処理工程で金属を回収する排水処理装置を提供する。【選択図】図１