Impacts of Biological Additives, Part 1: Solids Accumulation in Septic Tanks.
The efficacy of three septic tank additives and a control was assessed using a randomized complete-block design in a double-blind study described in this article. Sludge depth, scum thickness, and total solids were measured within 48 full-scale, functioning septic tanks. These tanks were distributed...
| Publicado en: | Journal of Environmental Health Vol. 74; no. 5; pp. 16 - 22 |
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| Autores principales: | , , , , , |
| Formato: | CEU research tables/charts Journal Article |
| Publicado: |
National Environmental Health Association
Dec2011
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=67471505&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 67471505 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00220892 EVH jtl: Journal of Environmental Health issn: 00220892 maglogo: N pubinfo: dt: Dec2011 vid: 74 iid: 5 pid: 1160 pub: National Environmental Health Association place: Denver, Colorado artinfo: ui: 67471505 67471505 104605387 67471505 ppf: 16 ppct: 6 formats: fmt: @attributes: type: P tig: atl: Impacts of Biological Additives, Part 1: Solids Accumulation in Septic Tanks. aug: au: Pradhan, S. Hoover, Michael T. Clark, G. H. Gumpertz, M. Cobb, C. Strock, J. affil: Professor, Department of Soil Science, North Carolina State University, P.O. Box 7619, Raleigh, NC 27695-7619 sug: subj: Sewage Analysis Human Education, Continuing (Credit) Double-Blind Studies Descriptive Statistics Analysis of Variance Confidence Intervals P-Value ab: The efficacy of three septic tank additives and a control was assessed using a randomized complete-block design in a double-blind study described in this article. Sludge depth, scum thickness, and total solids were measured within 48 full-scale, functioning septic tanks. These tanks were distributed across three sites with low, intermediate, and high prior-maintenance levels. No significant, positive long-term additive treatment effects occurred across all maintenance levels at the α = .05 level. Separate analyses of variance, however, indicated that at the high prior-maintenance site, significant treatment effects occurred on sludge depth, scum thickness, and total solids. Sludge depths for the Liquid-Plumr and Rid-X additives were significantly reduced compared to the control at the high-maintenance site, but not at the low-maintenance site. Liquid-Plumr septic tank additive had significantly greater sludge depth at the intermediate-maintenance site, which is a negative impact. Sludge accumulation rates averaged 6.9 cm/yr. for 3,780-L (1,000 gallons) septic tanks. pubtype: Academic Journal doctype: CEU research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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