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Journal articles
Magazine articles
Open Access
Techno-economic analysis of hydrothermal carbonization of pulp mill biosludge, TAPPI Journal March 2023

ABSTRACT: For many mills, the biosludge from wastewater treatment is difficult to recycle or dispose of. This makes it a challenging side stream and an important issue for chemical pulping. It often ends up being burned in the recovery or biomass boiler, although the moisture and non-process element (NPE) contents make it a problematic fuel. Biosludge has proven resistant to attempts to reduce its moisture. When incinerated in the biomass boiler, the heat from dry matter combustion is often insufficient to yield positive net heat. Mixing the sludge with black liquor in the evaporator plant for incineration in the recovery boiler is more energy efficient, but is still an additional load on the evaporator plant, as well as introducing NPEs to the liquor. In this study, treating the biosludge by hydrother-mal carbonization (HTC), a mild thermochemical conversion technology, is investigated. The HTC process has some notable advantages for biosludge treatment; taking place in water, it is well suited for sludge, and the hydrochar product is much easier to dewater than untreated sludge. In this study, two HTC plant designs are simulated using IPSEpro process simulation software, followed by economic analysis. Low temperature levels are used to minimize investment costs and steam consumption. The results show that if the sludge is incinerated in a biomass boiler, payback periods could be short at likely electricity prices. The HTC treatment before mixing the sludge with black liquor in the evaporator plant is profitable only if the freed evaporator capacity can be used to increase the firing liquor dry solids content.

Journal articles
Open Access
Development and Application of a Real-Time Recovery Boiler E

Development and Application of a Real-Time Recovery Boiler Expert System, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Recovery of Sulfur from Spent Semichemical Pulping Liquors,

Recovery of Sulfur from Spent Semichemical Pulping Liquors, 1991 Engineering Conference Proceedings

Journal articles
Open Access
Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Treatment of edta-containing pulp and paper mill wastewaters in activated sludge plants, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
A new stickies test method - statistically sound and user friendly, TAPPI JOURNAL, February 1999, Vol. 82(2)

A new stickies test method - statistically sound and user friendly, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
The polish pulp and paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

The polish pulp and paper industry, TAPPI JOURNAL, February 1999, Vol. 82(2)

Journal articles
Open Access
Investigation of Thin Fiber Mats Formed at High Velocity, TAPPI JOURNAL, January 1999, Vol. 83(5)

Investigation of Thin Fiber Mats Formed at High Velocity, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Global Pulp and Paper in Transition, TAPPI JOURNAL, January 1999, Vol. 83(5)

Global Pulp and Paper in Transition, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Economic Outlook for Asia's Pulp and Paper Industry, TAPPI JOURNAL, January 1999, Vol. 83(5)

Economic Outlook for Asia's Pulp and Paper Industry, TAPPI JOURNAL, January 1999, Vol. 83(5)

Journal articles
Open Access
Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

Australia's Paper and Forestry Forum: A Preview of Significant Issues for 1998-2008, TAPPI JOURNAL, January 1999, Vol. 83(5)

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