Title:
【発明の名称】二段廃水処理
Document Type and Number:
Japanese Patent JP2732536
Kind Code:
B2
Abstract:
A two-stage process for purifying wastewater containing organic and adsorbable pollutants includes the steps of first aerating the wastewater in the presence of a powdered adsorbent, such as activated carbon, and biologically active solids in the aeration zone of a primary treatment zone (10) which also includes a quiescent zone (14). The thus-treated water passes from the aeration zone (10) to the quiescent zone (14) where it is retained a sufficient time for a substantial portion of the suspended solids to settle by gravity. The partially-treated wastewater overflowing from the quiescent zone (14) is introduced into one or more contact zones (30) wherein it is agitated, preferably by aeration, in the presence of a powdered adsorbent, agitation is terminated and the solids are allowed to settle by gravity and, after completion of settling, clarified, substantially solids-free water is withdrawn from each contact zone.
Inventors:
UIRIAMU EMU KOPA
TOOMASU JEI UORUSUTETSUDO
TOOMASU JEI UORUSUTETSUDO
Application Number:
JP33271788A
Publication Date:
March 30, 1998
Filing Date:
December 28, 1988
Export Citation:
Assignee:
JINPURO PASABANTO ENBAIRONMENTO SHISUTEMUZU INC
International Classes:
C02F3/00; C02F3/12; C02F3/08; (IPC1-7): C02F3/08; C02F3/12
Domestic Patent References:
| JP5864190A | ||||
| JP6279900A | ||||
| JP5575794A | ||||
| JP46140A |
Other References:
Ａｄａｍ Ｎｇ．ｅｔ ａｌ．，″Ｎｉｔｒｉｆｉｃａｔｉｏｎ ｅｎｈａｎｃｅｍｅｎｔ ｉｎ ｔｈｅ ｐｏｗｄｅｒｅｄ ａｃｔｉｖａｔｅｄ ｃａｒｂｏｎ−ａｃｔｉｖａｔｅｄ ｓｌｕｄｇｅ ｐｒｏｃｅｓｓ ｆｏｒ ｔｈｅ ｔｒｏａｔｍｅｎｔ ｏｆ ｐｅｔｒｏｌｅｕｍ ｒｅｆｉｎｅｒｙ ｗａｓｔｅｗａｔｅｖｓ″，ＪＯＵＲＮＡＬ ＷＡＴＥＲ ＰＯＬＬＵＴＩＯＮ ＣＯＮＴＲＯＬ ＦＥＤＥＲＡＴＩＯＮ，（ＵＳ），１９８７，ｖｏｌ５９，ｎｏ４，ｐ１９９−２１１
Attorney, Agent or Firm:
Jun Tsuda (3 others)