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Control of malodorous gases emission from wet-end white water with hydrogen peroxide, TAPPI Journal October 2021
ABSTRACT: White water is highly recycled in the papermaking process so that its quality is easily deteriorated, thus producing lots of malodorous gases that are extremely harmful to human health and the environment. In this paper, the effect of hydrogen peroxide (H2O2) on the control of malodorous gases released from white water was investigated. The results showed that the released amount of total volatile organic compounds (TVOC) decreased gradually with the increase of H2O2 dosage. Specifically, the TVOC emission reached the minimum as the H2O2 dosage was 1.5 mmol/L, and meanwhile, the hydrogen sulfide (H2S) and ammonia (NH3) were almost completely removed. It was also found that pH had little effect on the release of TVOC as H2O2 was added, but it evidently affect-ed the release of H2S and NH3. When the pH value of the white water was changed to 4.0 or 9.0, the emission of TVOC decreased slightly, while both H2S and NH3 were completely removed in both cases. The ferrous ions (Fe2+) and the copper ions (Cu2+) were found to promote the generation of hydroxyl radicals (HO•) out of H2O2, enhancing its inhibition on the release of malodorous gases from white water. The Fe2+/H2O2 system and Cu2+/H2O2 system exhibited similar efficiency in inhibiting the TVOC releasing, whereas the Cu2+/H2O2 system showed better perfor-mance in removing H2S and NH3.
Journal articles
Magazine articles
Production of antimicrobial paper using nanosilver, nanocellulose, and chitosan from a coronavirus perspective, TAPPI Journal July 2021
ABSTRACT: The pulp and paper industry has an opportunity to play a vital role in breaking the spread of the COVID-19 pandemic through production that supports widespread use of antimicrobial paper. This paper provides a brief review of paper and paper-related industries, such as those producing relevant additives, and R&D organizations that are actively engaged in developing antimicrobial papers. The focus here is on the potential of three nano-additives for use in production of antimicrobial papers that combat coronavirus: nanosilver, nanocellulose, and chitosan. Various recent developments in relevant areas and concepts underlining the fight against coronavirus are also covered, as are related terms and concepts.
Journal articles
Magazine articles
Addressing production bottlenecks and brownstock washer optimization via a membrane concentration system, TAPPI Journal July 2021
ABSTRACT: Advancements in membrane systems indicate that they will soon be robust enough to concentrate weak black liquor. To date, the economic impact of membrane systems on brownstock washing in kraft mills has not been studied and is necessary to understand the viability of these emerging systems and their best utilization.This study investigated the savings that a membrane system can generate related to brownstock washing. We found that evaporation costs are the primary barrier for mills seeking to increase wash water usage. Without these additional evaporation costs, we showed that our hypothetical 1000 tons/day bleached and brown pulp mills can achieve annual savings of over $1.0 MM when operating at higher dilution factors and fixed pulp production rate. We then investigated the impact of increasing pulp production on mills limited by their equipment. In washer-limited mill examples, we calculated that membrane systems can reduce the annual operating cost for a 7% production increase by 91%. Similarly, in evaporator-limited mill examples, membrane systems can reduce the annual operating cost for a 7% production increase by 86%. These results indicated that membrane systems make a production increase significantly more feasible for these equipment-limited mills.
Developing Numeric Nutrient Criteria: Impacts on the Pulp and Paper Industry, 2008 Engineering, Pulping and Environmental Conference
Developing Numeric Nutrient Criteria: Impacts on the Pulp and Paper Industry, 2008 Engineering, Pulping and Environmental Conference
Measurement of Microstickies, 2008 Engineering, Pulping and Environmental Conference
Measurement of Microstickies, 2008 Engineering, Pulping and Environmental Conference
Effects of Extractives from Mountain Pine Beetle-Attacked Lodgepole Pine on Kraft Mills, 2008 Engineering, Pulping and Environmental Conference
Effects of Extractives from Mountain Pine Beetle-Attacked Lodgepole Pine on Kraft Mills, 2008 Engineering, Pulping and Environmental Conference
Effects on Kraft and Mechanical Pulping and Pulp Quality when Utilizing Mountain Pine Beetle-Killed (MPB) Wood: An Overview, 2008 Engineering, Pulping and Environmental Conference
Effects on Kraft and Mechanical Pulping and Pulp Quality when Utilizing Mountain Pine Beetle-Killed (MPB) Wood: An Overview, 2008 Engineering, Pulping and Environmental Conference
Energy Efficiency and Cost Reduction through the implementation of low pressure sootblowing system, 2008 Engineering, Pulping and Environmental Conference
Energy Efficiency and Cost Reduction through the implementation of low pressure sootblowing system, 2008 Engineering, Pulping and Environmental Conference
Experimental Study of Dioxin Formation and Emissions from Power Boilers Burning Salt-Laden Wood Waste, 2008 Engineering, Pulping and Environmental Conference
Experimental Study of Dioxin Formation and Emissions from Power Boilers Burning Salt-Laden Wood Waste, 2008 Engineering, Pulping and Environmental Conference
Membrane WESP-The lowest cost technology for fine particulate control to meet boiler MACT, 2008 Engineering, Pulping and Environmental Conference
Membrane WESP-The lowest cost technology for fine particulate control to meet boiler MACT, 2008 Engineering, Pulping and Environmental Conference