In:
Linnaeus Eco-Tech, Linnaeus University, ( 2007-12-12), p. 479-488
Abstract:
The reuse of greywater and other wastewaters are important considerations for effectivewater management strategies. It is also imperative that the potential for detrimentalenvironmental effects be investigated. As part of ongoing research into the reuse ofgreywater and oil-rich agro-wastewaters, the potential impact of oil and grease (O & G)to soils irrigated with greywater (GW) was studied. Greywater streams were sampledand analyzed for O & G content. Along with the greywater, soil profile samples werecollected from garden soils irrigated with these waters. The goal was to determine theO & G content of these GW streams, verify ifeO & G was accumulating in the soil profiles,and investigate the effect O & G can have on water movement through O & Gcontaminated soils.Untreated kitchen GW averaged 200 mg/L O & G, over an order of magnitude more thanother GW streams. GW-irrigated soils showed O & G accumulation of up to 200 mg/kgwithin the first 20-cm of depth. GW with low O & G concentration ( 〈 ! 0 mg/L) stilldemonstrated long-tenn accumulation in the soil profile, with O & G concentration of150 mg/kg. To detennine the potential effects that O & G accumulation may have onwater movement in soil, capillary rise and water drop penetration time (WDPT)experiments were conducted. The results showed up to 60% decrease in capillary rise insand containing 250 mg/kg O & G. Interestingly, no additional reduction in capillary risewas observed at concentrations above 250 mg/kg. WDPT was observed to increaselinearly (from nearly instantaneous to over 2 seconds) with increased O & G content, upto 1000 mg/kg. This work demonstrated that O & G in GW used for irrigation canaccumulate in soil and may lead to a significant water repellency and reduction in thesoils ability to transmit water.
Type of Medium:
Online Resource
ISSN:
2002-8008
DOI:
10.15626/10.15626/Eco-Tech.2007
DOI:
10.15626/Eco-Tech.2007.048
Language:
Unknown
Publisher:
Linnaeus University
Publication Date:
2007
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