Moisture Effect on Compaction and Permeability in Composts

Das, K. C.; Keener, H. M.

doi:10.1061/(asce)0733-9372(1997)123:3(275)

Cited by 97 publications

(58 citation statements)

References 11 publications

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“…Compared with the control, the moisture content of each treatment displayed a downward trend as levels of inoculum increased; the moisture of the manure with 0.5% inoculum was below 60% at day 6 ( Fig. 1b) and decreased to the optimal range of 50-60% for composting (Das and Keener, 1997;Gajalakshmi and Abbasi, 2008). All manure with maggot inoculum became noticeably granular by day 6, which was agreed with previous research results (Miller et al, 1974;Zhu et al, 2012).…”

Section: Trends Of Physical and Chemical Parameters For Pig Manure Ussupporting

confidence: 89%

Housefly maggot-treated composting as sustainable option for pig manure management

et al. 2015

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Section: Trends Of Physical and Chemical Parameters For Pig Manure Ussupporting

confidence: 89%

Housefly maggot-treated composting as sustainable option for pig manure management

et al. 2015

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“…The higher WC in this treatment caused the formation of conglomerates. Reduced oxygen movement within these wet conglomerates may have given rise to anaerobic conditions (Das and Keener, 1997), further causing a shorter thermophilic phase.…”

Section: Temperaturementioning

confidence: 99%

“…When the WC exceeds the 60% limit, oxygen movement is inhibited in the compost pile and the process becomes anaerobic (Das and Keener, 1997). Increased WC also results in a decrease in FAS within the composting pile (Iqbal et al, 2010).…”

Section: Water Contentmentioning

confidence: 99%

Effect of sawdust addition on composting of separated raw and anaerobically digested pig manure

Troy

Nolan

Kwapiński

et al. 2012

Journal of Environmental Management

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Comparison of GI at day 56 was performed using the MIXED procedure in SAS. initial heating phase, a thermophilic phase, and cooling/maturing phase (Figure 1(a) and (b)). 246The patterns of compost temperature change have been used to monitor the stabilization of the 247 composting process (Tiquia et al., 1996; Huang et al., 2004; Tiquia, 2005 The pH values followed a similar pattern for all treatments (Figure 2 (a) and (b) Treatments B and C were within the limits. Tiquia et al. (1996) found that a WC of 70 %

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“…Using a waste/sawdust ratio of 1/5 (mass), Liao et al (1993) successfully composted their mixture at a MC above 60%, while Higgins et al (1986) obtained similar positive effects with the use of lower W/BA ratios. For wood chips as BA, smaller particle sizes of 5 mm to 25 mm were shown to optimize compost performance (Raichura and McCartney, 2006), although material too finely divided can lead to structural collapses at high moisture (Das and Keener, 1997;Barrington et al, 2003). Richard et al (2002) suggests the possibility of mitigating the effects of MC outside an optimal range by manipulation of substrate density and particle size.…”

Section: Introductionmentioning

confidence: 99%

Microbial oxygen uptake in sludge as influenced by compost physical parameters

Mohajer¹,

Trémier

Barrington³

et al. 2009

Waste Management

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1The wide range of optimal values reported for the physical parameters of compost 2 mixtures suggest that their interactive relationships should be investigated. The objective of this 3 study was to examine the microbial O 2 uptake rate (OUR) in 16 sludge waste recipes, offering a 4 range of moisture content (MC), waste/bulking agent (W/BA) ratio and BA particle size levels 5 determined using a central composite experimental design. The 3 kg samples were maintained at 6 a constant temperature and aeration rate for 28 days, during which a respirometer recorded O 2 7 uptake to provide a measure of microbial activity and biodegradability. The cumulative O 2 8 consumption after 14 and 28 days was found to be significantly influenced by MC, W/BA ratio, 9BA particle size and the interaction between MC and W/BA ratio (p < 0.05). Using multivariate 10 regression analysis, the experimental data was used to generate a model with good predictive 11 ability for cumulative O 2 consumption after 28 days as a function of the significant physical 12 variables (R 2 = 0.84). The prediction of O 2 uptake by the model depended highly on the 13 interaction between MC and W/BA ratio. A MC outside of the traditional 50-60 % (wet basis) 14 range still resulted in a high level of microbial O 2 uptake as long as the W/BA ratio was adjusted 15 to maintain a good O 2 exchange in the sample. The evolution of OUR in the samples was also 16 investigated, uncovering strong associations between short and long-term respirometric indices, 17 such as peak OUR and cumulative O 2 consumption (p < 0.005). Combining peak OUR data with 18 cumulative O 2 consumption after 14 days allowed for accurate predictions of cumulative O 2 after 19 28 days of aeration (R 2 = 0.96), implying that future studies need only run trials up to 14 days to 20 evaluate the overall O 2 consumption or biodegradability of a sludge mixture. 21

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Moisture Effect on Compaction and Permeability in Composts

Cited by 97 publications

References 11 publications

Housefly maggot-treated composting as sustainable option for pig manure management

Housefly maggot-treated composting as sustainable option for pig manure management

Effect of sawdust addition on composting of separated raw and anaerobically digested pig manure

Microbial oxygen uptake in sludge as influenced by compost physical parameters

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