Phosphorus Recovery from Covered Digester Effluent with a Continuous-Flow Struvite Crystallizer

Westerman, P. W.; Bowers, Keith; Zering, Kelly D.

doi:10.13031/2013.29471

Cited by 15 publications

(15 citation statements)

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“…Examples from literature on animal slurries refer often to laboratory experiments (Szogi and Vanotti 2009;Shen et al 2012;Wahal et al 2011;Wendler Fernandes et al 2012;Shepherd, Burns, et al 2009b). Westerman et al (2010) present encouraging results on struvite formation in digestate from swine slurry with a continuous flow bed crystallizer (65% P recovery at a cost of $0.0146/kg of live weight pig slaughter). Also Jordaan et al (2010) show good results with liquid fractions of animal slurries after filtration or centrifuging.…”

Section: Introductionmentioning

confidence: 90%

“…However, we did not apply high-tech separation of the liquid fraction to prevent interference by organic matter, nor did we continuously mix the reactor, as a consequence of the strategy to recover the solid fraction by settlement. This leaves room for improvement by either applying better separation techniques before struvite production for less interference by organic matter, or by more efficient continuous flow crystallization and separation techniques (Westerman et al 2010;Shepherd, Burns, et al 2009a, 2009bShepherd, Burns, Raman, et al 2009). More effective mechanical separation of the liquid fraction, however, has the disadvantage of separation of solid P before struvite formation, unless the original material is acidified to dissolve solid P and increase P content of the liquid fraction.…”

Section: Figure 43b Recovery Of Phosphorus After Sieving In Liquid Amentioning

confidence: 99%

“…Continuous flow crystallization and separation also tends to be costly, despite the positive results of Westerman et al (2010). These authors used pig slurry from sows, which tends to have a much lower dry and organic matter content, which possibly explains why the separation of struvite from manure was more successful in their experiments.…”

Section: Figure 43b Recovery Of Phosphorus After Sieving In Liquid Amentioning

confidence: 99%

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Chemical phosphorus recovery from animal manure and digestate : Laboratory and pilot experiments

Schoumans

Ehlert

Regelink

et al. 2017

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Chemical phosphorus recovery from animal manure and digestate; Laboratory and pilot experiments.Wageningen, Wageningen Environmental Research, Report 2849. 114 pp.; 43 fig.; 37 tab.; 41 ref.Since a number of decades the Netherlands faces manure surpluses, because the amount of phosphate produced in animal manure is larger than the amount that can be applied on agricultural land according to the application limits. This surplus needs to be exported from the Dutch agricultural sector. The costs of manure export are however high, and therefore new, simple and cheap innovative techniques are needed to recover phosphate from fresh or digested manure (digestate). The relative small amount of concentrated recovered P can be transported more economically for use outside the Netherlands or can be utilized as secondary P resource for industries, e.g. for the production of fertiliser. We report laboratory and pilot experiments that were carried out in search for cheap and innovative techniques of phosphorus recovery. The main goal of the experiments was to reduce the P-content in pig slurry or digested pig slurry by 25% to 75%. If this goal can be reached with -recovery, in principle all manure including its valuable components (organic matter and other nutrients) can be applied sustainably on agricultural land in The Netherlands. The results show that both on laboratory scale and pilot scale 25-75% of P can be technically recovered with the so called 'acid-base approach'. From a sustainability point of view the impact is positives in terms of energy savings, CO 2 -savings, phosphorus savings and also nitrogen savings. The economical perspective is also positive but will strongly depend on the disposal prices of treated pig slurry with a reduced P content and its value as substitute for mineral N fertiliser and value in terms of organic soil improver on the manure market.Keywords: phosphate, manure, digestate, intensive livestock production, phosphate recovery, pig slurry, manure treatment, manure separation. • Acquisition, duplication and transmission of this publication is permitted with clear acknowledgement of the source.• Acquisition, duplication and transmission is not permitted for commercial purposes and/or monetary gain.• Acquisition, duplication and transmission is not permitted of any parts of this publication for which the copyrights clearly rest with other parties and/or are reserved. New innovative approaches are needed to close the phosphorus (P) cycle in The Netherlands because the agricultural sector currently produces about 25% more P, in the form of manure, than can be applied on land. One promising solution to deal with the surplus amount of P in manure is to recover the surplus of P in the form of a mineral P product for use as a P fertiliser (for export) or as a raw P feedstock for the P fertiliser industries. This idea for 'closing the manure P cycle in The Netherlands' has been circulating for a while, but was never thought well over until in 2013 a Public Private Partnership (PPP) was set up with t...

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Section: Introductionmentioning

confidence: 90%

Section: Figure 43b Recovery Of Phosphorus After Sieving In Liquid Amentioning

confidence: 99%

Section: Figure 43b Recovery Of Phosphorus After Sieving In Liquid Amentioning

confidence: 99%

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Chemical phosphorus recovery from animal manure and digestate : Laboratory and pilot experiments

Schoumans

Ehlert

Regelink

et al. 2017

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“…In practical application, both precipitation of struvite and the separation of struvite crystals should be considered. For these purposes, several reactors for removing and recovering phosphorous from swine wastewater have been designed [18][19][20]. However, the separation of struvite particles for the total phosphorus (TP) removed was still an outstanding issue [21].…”

Section: Introductionmentioning

confidence: 99%

Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Song

Qiu

Yuan

et al. 2011

Journal of Hazardous Materials

154

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“…A potential revenue source from digestion by-products stems from the recovery of struvite (magnesium ammonium phosphate) from digester effluent for use as a commercial fertilizer. Struvite is being successfully recovered in Europe and Asia and on a pilot-scale basis in the U.S. [72,73]. Digested fiber has found use in the production of biodegradable plant pots and as a nursery media component to replace peat, coir and bark [74].…”

Section: Additional Potential Revenue Sourcesmentioning

confidence: 99%

Economic analysis of small-scale agricultural digesters in the United States

Klavon

Lansing

Mulbry

et al. 2013

Biomass and Bioenergy

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Phosphorus Recovery from Covered Digester Effluent with a Continuous-Flow Struvite Crystallizer

Cited by 15 publications

References 0 publications

Chemical phosphorus recovery from animal manure and digestate : Laboratory and pilot experiments

Chemical phosphorus recovery from animal manure and digestate : Laboratory and pilot experiments

Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions

Economic analysis of small-scale agricultural digesters in the United States

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