Dewatering of peat slurry produced by wet milling technique

Pentti Pirkonen

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


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
JournalFiltration + Separation
Issue number4
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed


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