| 1. |
- Aulenbach, Donald B., et al.
(författare)
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Removal of heavy metals in potw using alum or sodium aluminate for phosphorus removal
- 1984
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Ingår i: Proceedings of Mid-Atlantic Industrial Waste Conference. ; , s. 318-330
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Konferensbidrag (refereegranskat)abstract
- The addition of alum or sodium aluminate at dosages which effectively remove phosphorus is beneficial in removing copper, chromium, and lead when present in wastewaters. Chromium removal is enhanced by sodium aluminate addition, but alum does not affect chromium removal. Both types of aluminum salts appear to increase the removal of lead, but the large variance in the data does not allow this to be confirmed by the t-tests. Of the remaining metals analyzed, no difference in removal was observed with and without aluminum salt addition for cadmium or antimony, nor was there any difference in TOC removal. Mercury was effectively removed to below the detection limit by primary sedimentation, so no further removal was achieved during secondary treatment when the alum/aluminate was added. Other metals were not present in amounts above detection limits.
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| 2. |
- Aulenbach, Donald B., et al.
(författare)
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Removal of Heavy Metals in Publicly Owned Treatment Works
- 1987
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Ingår i: Environmental Progress. ; 6:2, s. 91-98
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Tidskriftsartikel (refereegranskat)abstract
- Studies were conducted at three activated sludge treatment plants during normal operation. The heavy metals were measured in the influent to each plant, the primary sedimentation effluent where applicable, the discharge after activated sludge treatment and secondary sedimentation, and in one case after a final polishing filter. Both the soluble and the total portions were measured. Beryllium, nickel, and thallium were not found in detectable levels in any of the plant influents. Mercury was found in only trace amounts. The removals of the other metals varied considerably. No consistent conclusions can be made from the data; each metal, soluble or total fraction, and unit treatment operation must be interpreted individually. The only metal in the plant effluents consistently above the recommended limit was arsenic, and this barely above the limit, and the lead content from Fitchburg, despite 83% removal.
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| 3. |
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