Evaluation of a Weeping Wall Solid-Liquid Separation System for Flushed Dairy Manure

Mukhtar, Saqib; Borhan, Md. Saidul; Beseda, J.

doi:10.13031/2013.36223

Cited by 11 publications

(7 citation statements)

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“…The WS was collected from typical uncovered below-ground pits. The SLF was obtained from the second stage of a two-stage lagoon system connected through a weeping wall as described by Mukhtar et al (2011).…”

Section: Site and Experiments Descriptionmentioning

confidence: 99%

Year-Round N2O Emissions From Long-Term Applications of Whole and Separated Liquid Dairy Slurry on a Perennial Grass Sward and Strategies for Mitigation

Hunt

Bittman

Chantigny

et al. 2019

Front. Sustain. Food Syst.

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Dairy farms need to improve their environmental performance to justify continued consumption of dairy products. Previous studies have demonstrated improved re-use of dairy slurry nitrogen (N) and phosphorous (P) by separating solid and liquid fractions. This study was conducted to examine the long-term effects of applying whole dairy slurry (WS), separated liquid fraction (SLF), and mineral fertilizer on emission of nitrous oxide (N 2 O) from a grass sward in a moderate climate, and to identify methods to mitigate emissions. The results show that emission occurs in sharp spikes within a week of N application as well as after some wet/dry cycles and freeze/ thaw cycles even in this moderate climate. Greatest emissions occurred from late spring and summer applications. At the high application rate of total-N emissions were similar for WS and SLF, at the lower rate SLF exceeded WS, whereas at equivalent mineral-N, emissions were greater from WS than SLF. On the basis of crop N-uptake, SLF had similar or lower emissions than WS at comparable N rates, and the same was true on basis of yield except for lower emissions with WS than SLF at the low total-N rate (400 kg ha −1). By not finding pollution swapping, the study helps to support the use of slurry manure separation for its agronomic and environmental benefits. This multi-year field study supports current IPCC default values as cautious emission factors (EF) for dairy slurry and commercial fertilizer on intensively managed grass, though a lower EF may be justified for lower input grassland (<50 kg mineral-N ha −1 per dose). Our results suggest that N 2 O emissions can be reduced by transferring summer slurry application to early spring but on farms where this is not possible, mitigating summertime peaks should be targeted, possibly with the use of a nitrification inhibitor.

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Section: Site and Experiments Descriptionmentioning

confidence: 99%

Year-Round N2O Emissions From Long-Term Applications of Whole and Separated Liquid Dairy Slurry on a Perennial Grass Sward and Strategies for Mitigation

Hunt

Bittman

Chantigny

et al. 2019

Front. Sustain. Food Syst.

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“…The bedding consisted of sawdust. The WS was collected after agitation from uncovered belowground storage tanks, and the LF was obtained from the second stage of a weeping wall solid-liquid separation system, as described by Mukhtar et al (2011). To reduce ammonia emissions during field application, the slurries were surface banded using a trailing shoe applicator, as mentioned in Bittman et al (2011).…”

Section: Experimental Design and Treatmentsmentioning

confidence: 99%

Availability of Phosphorus after Long‐term Whole and Separated Slurry Application to Perennial Grass prior to Corn Silage

Zhang¹,

Bittman²,

Hunt³

et al. 2018

J of Env Quality

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Removing solids from whole dairy slurry (WS) can reduce P loading on fields. This study investigated the effects of 11 yr of applications of WS, separated liquid fraction (LF), commercial fertilizer, WS plus fertilizer, and a control on total and extractable (Kelowna) soil P in perennial grass ( Schreb.) and two subsequent silage corn ( L.) crops. Plots received 200 kg N ha with or without 40 kg P ha. Shoot biomass, P uptake, arbuscular mycorrhizal fungi root colonization, and soil microbial P were determined for corn at six leaves. Whole-crop and grain yield, P uptake, dry matter, and grain content were determined at maturity. The LF treatment received 30% less manure P than WS, had lower extractable soil P at 0 to 15 and 15 to 30 cm, and had lower total P at 0 to 15 cm. Historical treatments had no effect on soil microbial P or arbuscular mycorrhizal fungi colonization. At six leaves, corn shoot biomass, P concentration, and P uptake were related to historical P rates in Year 2, but the relationship was not apparent in Year 1. Starter P fertilizer increased shoot yield and P uptake for all treatments in both years. At maturity, most yield parameters for WS and LF were similar in Year 1, but in Year 2, there was a significant response to starter P fertilizer and a positive relationship between historical P rate and corn performance. This study shows that long-term LF treatments reduced the risk of P pollution with relatively little effect on the P response of subsequent corn crops.

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“…The solid-liquid separation can also be installed after the AD process, where the solids can be used as the animal bedding materials. Numerous technologies have been developed to effectively and efficiently separate the solid and the liquid portions of the manure [18][19][20][21][22][23]; however, it is still considered as a pretreatment or as a first stage decontamination in highly polluted effluents with high content of particulate phosphorus. Even with the solid-liquid separation, the liquid waste still contains high concentration of phosphorus, while the phosphorus content of the solids is very low and the transportation of manure solids is still limiting the applications of phosphorus in a wider region.…”

Section: Anaerobic Digestionmentioning

confidence: 99%

Phosphorus Removal and Recovery from Digestate after Biogas Production

Lin¹,

Gan²,

Rajendran³

et al. 2015

Biofuels - Status and Perspective

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Evaluation of a Weeping Wall Solid-Liquid Separation System for Flushed Dairy Manure

Cited by 11 publications

References 0 publications

Year-Round N2O Emissions From Long-Term Applications of Whole and Separated Liquid Dairy Slurry on a Perennial Grass Sward and Strategies for Mitigation

Year-Round N2O Emissions From Long-Term Applications of Whole and Separated Liquid Dairy Slurry on a Perennial Grass Sward and Strategies for Mitigation

Availability of Phosphorus after Long‐term Whole and Separated Slurry Application to Perennial Grass prior to Corn Silage

Phosphorus Removal and Recovery from Digestate after Biogas Production

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