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Magazine articles
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.
Magazine articles
Beauty or the beast: life after iso 9000, TAPPI JOURNAL, October 1994, Vol. 77(10)
Beauty or the beast: life after iso 9000, TAPPI JOURNAL, October 1994, Vol. 77(10)
Magazine articles
Shop Talk: Screw presses in waste dewatering, December 1995 Tappi Journal [95Dec233.pdf]
Screw presses in waste dewatering, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
Life-Cycle Assessment: background and update, December 1995 Tappi Journal [95Dec41.pdf]
Life-cycle assessment: background and update, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
Optical properties of pulp and paperâ?? New standardization proposals, December 1995 Tappi Journal [95Dec45.pdf]
Optical properties of pulp and paper - new standardization proposals, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
Mönsterås going 100% TCF as it increases production and minimizes emissions, December 1995 Tappi Journal [95Dec49.pdf]
Monsteras going 100% tcf as it increases production and minimizes emissions, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
CEO forecast: the recovery has arrived, TAPPI JOURNAL, January 1995, Vol. 78(1)
CEO forecast: the recovery has arrived, TAPPI JOURNAL, January 1995, Vol. 78(1)
Magazine articles
Supplier forecast: suppliers feel ripples from the recovery, TAPPI JOURNAL, January 1995, Vol. 78(1)
Supplier forecast: suppliers feel ripples from the recovery, TAPPI JOURNAL, January 1995, Vol. 78(1)
Magazine articles
Corrosion of titanium in alkaline hydrogen peroxide bleaching solution, TAPPI JOURNAL, June 1995, Vol. 78(6)
Corrosion of titanium in alkaline hydrogen peroxide bleaching solution, TAPPI JOURNAL, June 1995, Vol. 78(6)
Magazine articles
Corrosion of nickel-base alloys in chlorine dioxide environments, TAPPI JOURNAL, June 1995, Vol. 78(6)
Corrosion of nickel-base alloys in chlorine dioxide environments, TAPPI JOURNAL, June 1995, Vol. 78(6)