Dewatering of peat slurry produced by wet milling technique

Pentti Pirkonen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The effects of slurrying, long distance pumping, chemical dosage, pH, dry solid load and pressure on the dewatering of Carex Peat slurry ware studied. Raw peat at 75% moisture was slurried and pumped through a pilot-scale pipeline simulating 20 km transport. The goal was to establish the conditions to achieve a dry solids content (DS) of 35%, which would make the peat a suitable fuel for advanced power plants. It was found that slurry was dewatered to a solids content of 40–45% with a capacity of 10–15 kg(DS)/hm2. Pressure was a dominant factor, optimized at 50–60 bar. Long-distance pumping lowered the DS content of the cake only slightly. The required dosage of anionic flocculant was only 0.5 kg/t(DS), and lowering the pH level of the slurry to <3.7 from the natural value of 4.7 was also beneficial. The results indicate the feasibility of obtaining a DS content of 35% with high capacity, and there is at least one suitable type of chamber filter press available on the market. However, more extensive experiments are needed.

Original languageEnglish
Pages (from-to)327-330, 326
Number of pages5
JournalFiltration + Separation
Volume30
Issue number4
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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Peat
Dewatering
dewatering
slurry
peat
pumping
power plant
Power plants
Moisture
Pipelines
moisture
filter
market

Cite this

Pirkonen, Pentti. / Dewatering of peat slurry produced by wet milling technique. In: Filtration + Separation. 1993 ; Vol. 30, No. 4. pp. 327-330, 326.
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title = "Dewatering of peat slurry produced by wet milling technique",
abstract = "The effects of slurrying, long distance pumping, chemical dosage, pH, dry solid load and pressure on the dewatering of Carex Peat slurry ware studied. Raw peat at 75{\%} moisture was slurried and pumped through a pilot-scale pipeline simulating 20 km transport. The goal was to establish the conditions to achieve a dry solids content (DS) of 35{\%}, which would make the peat a suitable fuel for advanced power plants. It was found that slurry was dewatered to a solids content of 40–45{\%} with a capacity of 10–15 kg(DS)/hm2. Pressure was a dominant factor, optimized at 50–60 bar. Long-distance pumping lowered the DS content of the cake only slightly. The required dosage of anionic flocculant was only 0.5 kg/t(DS), and lowering the pH level of the slurry to <3.7 from the natural value of 4.7 was also beneficial. The results indicate the feasibility of obtaining a DS content of 35{\%} with high capacity, and there is at least one suitable type of chamber filter press available on the market. However, more extensive experiments are needed.",
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Dewatering of peat slurry produced by wet milling technique. / Pirkonen, Pentti.

In: Filtration + Separation, Vol. 30, No. 4, 1993, p. 327-330, 326.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Dewatering of peat slurry produced by wet milling technique

AU - Pirkonen, Pentti

N1 - Project code: PLT7005

PY - 1993

Y1 - 1993

N2 - The effects of slurrying, long distance pumping, chemical dosage, pH, dry solid load and pressure on the dewatering of Carex Peat slurry ware studied. Raw peat at 75% moisture was slurried and pumped through a pilot-scale pipeline simulating 20 km transport. The goal was to establish the conditions to achieve a dry solids content (DS) of 35%, which would make the peat a suitable fuel for advanced power plants. It was found that slurry was dewatered to a solids content of 40–45% with a capacity of 10–15 kg(DS)/hm2. Pressure was a dominant factor, optimized at 50–60 bar. Long-distance pumping lowered the DS content of the cake only slightly. The required dosage of anionic flocculant was only 0.5 kg/t(DS), and lowering the pH level of the slurry to <3.7 from the natural value of 4.7 was also beneficial. The results indicate the feasibility of obtaining a DS content of 35% with high capacity, and there is at least one suitable type of chamber filter press available on the market. However, more extensive experiments are needed.

AB - The effects of slurrying, long distance pumping, chemical dosage, pH, dry solid load and pressure on the dewatering of Carex Peat slurry ware studied. Raw peat at 75% moisture was slurried and pumped through a pilot-scale pipeline simulating 20 km transport. The goal was to establish the conditions to achieve a dry solids content (DS) of 35%, which would make the peat a suitable fuel for advanced power plants. It was found that slurry was dewatered to a solids content of 40–45% with a capacity of 10–15 kg(DS)/hm2. Pressure was a dominant factor, optimized at 50–60 bar. Long-distance pumping lowered the DS content of the cake only slightly. The required dosage of anionic flocculant was only 0.5 kg/t(DS), and lowering the pH level of the slurry to <3.7 from the natural value of 4.7 was also beneficial. The results indicate the feasibility of obtaining a DS content of 35% with high capacity, and there is at least one suitable type of chamber filter press available on the market. However, more extensive experiments are needed.

U2 - 10.1016/0015-1882(93)80251-Q

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JF - Filtration + Separation

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