There Reduction of alkali loss in an ash leaching system

TAPPI Journal ◽  
2017 ◽  
Vol 16 (7) ◽  
pp. 383-391
Author(s):  
CARLA CÉLIA ROSA MEDEIROS ◽  
FLÁVIA AZEVEDO SILVA ◽  
SAULO GODOY PIGNATON ◽  
ESTANISLAU VICTOR ZUTAUTAS ◽  
KLEVERSON FIGUEIREDO
Keyword(s):  
Solid Waste ◽  
Air Emissions ◽  
Recovery Cycle ◽  
Chloride Level ◽  
Control Loops ◽  
Kraft Mill ◽  
Recovery Boiler ◽  
Ash Leaching

There are many points in a kraft mill where the alkaline compounds are purged from the process. Several effluents, solid waste, and air emissions contain alkali, which leads to the necessity of chemical makeups to maintain the liquor balance. The main loss of alkali at the Veracel mill is present in the wastewater from the recovery boiler; more precisely, it is from the ash leaching system, which represents 80% of the total losses. To minimize the alkaline losses while keeping the chloride level in the recovery cycle under control, a project was developed at Veracel. Key actions were taken by adjusting the control loops of the ash leaching system, mainly on the slurry density and purge control. These adjustments led to a decrease in alkali losses and to an increase of treated ash, and kept the chloride level of the recovery boiler dust at 2.6%.

Health risk assessment of air emissions from a municipal solid waste incineration plant – A case study

2008 ◽  
Vol 28 (5) ◽  
pp. 885-895 ◽  
Author(s):  
Federico Cangialosi ◽  
Gianluca Intini ◽  
Lorenzo Liberti ◽  
Michele Notarnicola ◽  
Paolo Stellacci
Keyword(s):  
Risk Assessment ◽  
Health Risk ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Health Risk Assessment ◽  
Waste Incineration ◽  
Air Emissions ◽  
Municipal Solid Waste Incineration ◽  
Incineration Plant

New FGD Developments in Europe

2001 ◽  
Author(s):  
Anthony Licata ◽  
Wolfgang Schuettenhelm ◽  
Ryszard Kubisa
Keyword(s):  
Energy Conversion ◽  
Solid Waste ◽  
Waste To Energy ◽  
Conversion Process ◽  
Air Emissions ◽  
The Past ◽  
Emission Standards ◽  
Energy Conversion Process ◽  
Recycle And Reuse ◽  
Energy Plants

Abstract In Europe over the past 40 years there has been considerable social, regulatory, and economic pressures to manage solid waste in a manner that is beneficial to mankind. There have been many successful programs to minimize waste, recycle and reuse waste through energy conversion. As part of the energy conversion process strict air emissions emission standards have been adopted for waste-to-energy plants.

scholarly journals Waste Wood Fly Ash Treatment in Switzerland: Effects of Co-Processing with Fly Ash from Municipal Solid Waste on Cr(VI) Reduction and Heavy Metal Recovery

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 146
Author(s):  
Mirjam Wolffers ◽  
Gisela Weibel ◽  
Urs Eggenberger
Keyword(s):  
Heavy Metal ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Incineration ◽  
Metal Recovery ◽  
Successful Outcome ◽  
Mineralogical Characterization ◽  
Waste Wood ◽  
Ash Leaching

In Switzerland, waste wood fly ash (WWFA) must be treated before deposition on landfills due to its high pollutant load (Cr(VI) and heavy metals). Acid fly ash leaching, the process used for heavy metal recovery from municipal solid waste incineration fly ash (MSWIFA), represents a possible treatment for heavy metal depletion and Cr(VI) reduction in WWFA. The co-processing of WWFA with MSWIFA during acid fly ash leaching was investigated in laboratory- and industrial-scale experiments with different setups. Of interest were the effects on heavy metal recovery efficiency, the successful outcome of Cr(VI) reduction and consumption of neutralizing chemicals (HCl, H2O2). Detailed chemical and mineralogical characterization of two WWFA types and MSWIFA showed that MSWIFA has higher concentrations in potentially harmful elements than WWFA. However, both WWFA types showed high concentrations in Pb and Cr(VI), and therefore need treatment prior to deposition. Depending on the waste wood proportion and quality, WWFA showed chemical and mineralogical differences that affect leaching behavior. In all experimental setups, successful Cr(VI) reduction was achieved. However, WWFA showed higher consumption of HCl and H2O2, the latter resulting in a particularly negative effect on the recovery of Pb and Cu. Thus, co-processing of smaller WWFA portions could be expedient in order to diminish the negative effects of Pb and Cu recovery.

A Comparison of Air Emissions of Conversion Technology Processes Using Materials Recovery Facility Residues

2012 ◽  
Author(s):  
Timothy J. Raibley
Keyword(s):  
Waste Management ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Disposal ◽  
Waste Materials ◽  
Air Emissions ◽  
Beneficial Use ◽  
Technology Processes ◽  
Energy From Waste ◽  
Conversion Technology

In order to maximize the beneficial use of waste materials within its jurisdiction, the Western Placer Waste Management Authority (Authority) is exploring the economic, technical, and regulatory feasibility of recovering energy from waste residues delivered to its waste management facility. The purpose of the Study is to support the results of the Authority’s analysis of the emissions associated with converting municipal solid waste (MSW) residuals currently being landfilled into energy as compared to current waste disposal practices.

scholarly journals In-Situ Measurements of Sootblower Jet Impact in a Recovery Boiler

TAPPI Journal ◽  
2011 ◽  
Vol 10 (2) ◽  
pp. 27-32 ◽  
Author(s):  
KARI SAVIHARJU ◽  
ANDREI KALIAZINE ◽  
HONGHI TRAN ◽  
TONY HABIB
Keyword(s):  
Flue Gas ◽  
Force Measurement ◽  
In Situ Measurements ◽  
Insignificant Effect ◽  
Jet Impact ◽  
Kraft Mill ◽  
Recovery Boiler ◽  
Original Strength ◽  
Close Distance

Two mill trials were conducted in a recovery boiler at a kraft mill in Sweden using a force measurement probe to examine the performance of a sootblower under different blowing conditions. The results show that at a given distance, the force produced by the sootblower jet increases almost linearly with an increase in lance pressure. At a given lance pressure, the jet force decreases rapidly as the distance increases, retaining less than 10% of its original strength at a distance beyond 1 m from the nozzle. The results also suggest that flue gas temperatures in the vicinity of the sootblower have an insignificant effect on sootblower performance, and that the sootblowing jet force exerted on a tube target can fluctuate widely, particularly at a close distance. Force fluctuations are caused mainly by the vibration of the target as it is struck by the jet. The change in jet strength is caused by platen swinging and the tremor of the system that holds the target.

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