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5.
Method (3) (the use of ferric chloride for phosphorus removal ahead of
the secondary clarifiers) was found to be relatively inexpensive, both
in i~itial cost and in operation. Total project cost is estimated at
$3,162,000, a savings in initial investment of $4,566,000. Operating
cost~ for phosphorus removal by ferric chloride are estimated to be $2,975
per day at a flow of 45 MGD (which included $286 for digested sludge handling).
This also compares to the $2,770 per day at a flow of 45 MGD estimated
for the lime system using a kiln for recalcining.
The site for disposal contains between 100 and 150 net acres. This area
will provide approximately 1 year's storage for the additional sludge
produced from the phosphorus treatment process. Based upon observation
of the present digested sludge lagoons, this should be adequate for a
mixture of digested sludge and ferric precipitate.
The use of ferric chloride for phosphorus removal may have certain disadvantages.
It is possible that future water quality criteria may limit
the chloride content in wastewater effluents. The ferric chloride system
discussed as Method (3) will add over 50 mg/l of chloride ions to the
discharge to the Maumee River in future years. Secondly, it is felt that
the presence of the significant quantities of iron in the sludge in the
anaerobic digesters may eventually adversely affect their operation.
The third point, concerns the ultimate disposal (or use) of the dried
sludge from the lagoons. It is possible that the citizens will no longer
consider this material as a desirable soil conditioner due to its high
iron content. No objection to iron content of }lilorganite, which is a
processed packaged product and contains iron, has been reported.
Object Description
| Title | Master plan for sewers (pt. 3) |
| Alternative Title | Water pollution control plant |
| Contributor |
Henry B. Steeg & Associates Fort Wayne (Ind.). Board of Public Works |
| Topic | Public Utilities |
| Subject | Sewage disposal--Indiana--Fort Wayne |
| Geographical Coverage | Fort Wayne, Indiana |
| Date of Original | January 1972 |
| Time Period | 1900-1999 |
| Source | Print version: Master plan for sewers. Pt. 3: Water pollution control plant. (Indianapolis, Ind.: Henry B. Steeg & Associates, 1972), 1 v. |
| Additional Availability | Print version might be available at IPFW Helmke Library. See online catalog. |
| Relation | Third of three parts of Master plan for sewer. Pt. 1, Relief sewers, digital barcode is 30000126499916; Pt. 2, Sanitary sewers, digital barcode is 30000126499924; |
| Rights | Copyright Indiana University-Purdue University Fort Wayne, 2006- . All rights reserved. May not be reproduced without permission. For information regarding reproduction and use see: http://cdm16776.contentdm.oclc.org/cdm/about/collection/p16776coll1/ |
| Date Digitally Created | April 17 2012 |
| Digital Publisher | Walter E. Helmke Library, Indiana University-Purdue University Fort Wayne |
| Digitization Specifications | This pdf file was derived from 400 dpi, 1-bit, uncompressed TIFF images that were scanned from the originals using a Fujitsu 5750C scanner with Adobe Acrobat 9.0 Professional scanning software, black and white configuration. |
| Content Type | Text |
| Digital Format | text/pdf |
| Collection | Fort Wayne Area Government Information |
| Identifier | 30000126499932 |
| File Name | 30000126499932.pdf |
Description
| Title | Page 235 |
| Transcript | 5. Method (3) (the use of ferric chloride for phosphorus removal ahead of the secondary clarifiers) was found to be relatively inexpensive, both in i~itial cost and in operation. Total project cost is estimated at $3,162,000, a savings in initial investment of $4,566,000. Operating cost~ for phosphorus removal by ferric chloride are estimated to be $2,975 per day at a flow of 45 MGD (which included $286 for digested sludge handling). This also compares to the $2,770 per day at a flow of 45 MGD estimated for the lime system using a kiln for recalcining. The site for disposal contains between 100 and 150 net acres. This area will provide approximately 1 year's storage for the additional sludge produced from the phosphorus treatment process. Based upon observation of the present digested sludge lagoons, this should be adequate for a mixture of digested sludge and ferric precipitate. The use of ferric chloride for phosphorus removal may have certain disadvantages. It is possible that future water quality criteria may limit the chloride content in wastewater effluents. The ferric chloride system discussed as Method (3) will add over 50 mg/l of chloride ions to the discharge to the Maumee River in future years. Secondly, it is felt that the presence of the significant quantities of iron in the sludge in the anaerobic digesters may eventually adversely affect their operation. The third point, concerns the ultimate disposal (or use) of the dried sludge from the lagoons. It is possible that the citizens will no longer consider this material as a desirable soil conditioner due to its high iron content. No objection to iron content of }lilorganite, which is a processed packaged product and contains iron, has been reported. |
