Method and system of cleansing a filter bed
US4617131A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1985 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Jul 29, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D24/4647
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved method of cleansing a filter bed is herein provided utilizing a backwash pump (12) having an inlet line (14) and an outlet line (16). The improved method and system includes two cycle operations. Initially, the filter bed is backwashed to remove contaminants from the filter bed with the backwash pump (12) drawing liquid from an effluent channel (26). A portion of the liquid passing on backwash pump outlet line (26) is passed through a bypass adjustment valve (34) for egress on an outlet line (38) for recirculation to the effluent channel (26). The second stage of the cleansing operation is through a purging cycle where the filter bed is purged subsequent to the backwashing operation for removal of further contaminants from the filter bed. In the purging cycle, a closed loop system is formed between the backwash pump (12) and the backwash shoe (28) with a portion of liquid being diverted through a purge adjustment valve member (44) for egress on an outlet line (46) external to the system or to a separate filter member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.