Emission Characteristics of Heavy Metals and Organic Pollutants from the Combustion of Sewage Sludge in a Fluidized Bed Combustor

2008 ◽  
Vol 22 (4) ◽  
pp. 2278-2283 ◽  
Author(s):  
Jingai Shao ◽  
Rong Yan ◽  
Hanping Chen ◽  
Haiping Yang ◽  
Dong Ho Lee ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Organic Pollutants ◽  
Emission Characteristics ◽  
Fluidized Bed Combustor

The Study of Partitioning of Heavy Metals During Fluidized Bed Combustion of Sewage Sludge and Coal

2005 ◽  
Vol 128 (2) ◽  
pp. 104-110 ◽  
Author(s):  
I. Gulyurtlu ◽  
M. Helena Lopes ◽  
P. Abelha ◽  
I. Cabrita ◽  
J. F. Santos Oliveira
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Bituminous Coal ◽  
Fluidized Bed Combustion ◽  
Sulphur Compounds ◽  
Legal Limits ◽  
Higher Temperature ◽  
Combustion Tests ◽  
Fluidized Bed Combustor

The behavior of Cd, Cr, Cu, Co, Mn, Ni, Pb, Zn, and Hg during the combustion tests of a dry granular sewage sludge on a fluidized bed combustor pilot (FBC) of about 0.3 MW was evaluated. The emissions of these heavy metals from mono-combustion were compared with those of co-combustion of the sludge with a bituminous coal. The effect of the addition of limestone was also studied in order to retain sulphur compounds and to verify its influence on the retention of heavy metals (HM). Heavy metals were collected and analyzed from different locations of the installation, which included the stack, the two cyclones, and the material removed from the bed. The results showed that the volatility of metals was rather low, resulting in emissions below the legal limits of the new directive on incineration, with the exception of Hg during the mono-combustion tests. The partitioning of metals, except for Hg, appeared to follow that of ashes, amounting to levels above 90% in the bed streams in the mono-combustion case. For co-combustion, there was a lower fixation of HM in the bed ashes, mostly originating essentially from the sewage sludge, ranging between 40% and 80%. It is believed that in this latter case, a slightly higher temperature could have enhanced the volatilization, especially of Cd and Pb. However these metals were then retained in fly ashes captured in the cyclones. In the case of Hg, the volatilisation was complete. The bed ashes were free of Hg and part of Hg was retained in the cyclones and the rest was emitted either with fine ash particles or in gaseous forms. In mono-combustion the Hg emissions from the stack (particles and gas) accounted for about 50%, although there was a significant amount unaccounted for. This appeared to have significantly decreased in the case of co-combustion, as only about 15% has been emitted, due to the retention effect of cyclone ashes which presented high quantities of unburned matter, calcium and sulphur.

NOx and N2O Emission Characteristics From Circulation Fluidized Bed Combustion of Blends of Paper Mill Sludge and Coal

2005 ◽  
Author(s):  
Xiao-Ping Chen ◽  
Li-Feng Gu ◽  
Chang-Sui Zhao ◽  
Ai-Qiang Zhu ◽  
Xin Sun
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Paper Mill ◽  
N2o Emission ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Emission Characteristics ◽  
Fluidized Bed Combustion ◽  
Paper Mill Sludge ◽  
Excess Air

With the rapid economic development and the increase in population in the whole world, the amount of municipal sewage (MS) is increasing and lead to a rapid increasing in amount of municipal sewage sludge (MSS). Combustion of municipal sewage sludge may be a viable solution for its disposal in some cases and so is its co-combustion with coal. Whereas significant information is available on NOx and N2O emissions characteristics of sludge and coal individually, not much has been reported on sludge/coal blends. In the present paper, investigations in NOx and N2O emission characteristics from circulation fluidized bed combustion of blends of municipal sewage sludge and coal were conducted in a 0.2MWth circulating fluidized bed test facility with cross section of 0.23×0.23m2 and height of 5.9m. Coal sample selected was a kind of lignite, while a kind of paper mill sludge was used as sludge sample. The influences of sludge/coal mixing rate, excess air ratio and second air ratio on NOx and N2O emission characteristics have been studied. Test results show that co-combustion of sewage sludge and coal is feasible. With the increasing in proportion of sludge of the sludge/coal blends, the temperatures in dense bed and freeboard decrease rapidly, and the emissions of NOx decrease while the emission of N2O increases obviously. With the increasing in excess air ratio, the emission concentrations of NOx and N2O increase. While with the increasing in secondary air ratio, the emission concentrations of NOx and N2O decrease.

Combustion Characteristics of Sewage Sludge in Pressurized Fluidized Bed Combustor

2004 ◽  
Vol 2004.14 (0) ◽  
pp. 216-219
Author(s):  
Yoshizo SUZUKI ◽  
Shuichi OCHI ◽  
Tomoyuki NOJIMA ◽  
Masaki KATAOKA ◽  
Minoru TSUKAMOTO
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Combustion Characteristics ◽  
Fluidized Bed Combustor

815 Combustion Characteristics of a Pressurized Fluidized Bed Combustor using Sewage Sludge

2008 ◽  
Vol 2008.83 (0) ◽  
pp. _8-20_
Author(s):  
Takahiro MURAKAMI ◽  
Yoshizo SUZUKI ◽  
Hidekazu NAGASAWA ◽  
Takafumi YAMAMOTO ◽  
Takami KOSEKI ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Combustion Characteristics ◽  
Fluidized Bed Combustor

Gasification and its emission characteristics for dried sewage sludge utilizing a fluidized bed gasifier

2011 ◽  
Vol 13 (3) ◽  
pp. 180-185 ◽  
Author(s):  
Seong-Wan Kang ◽  
Jong-In Dong ◽  
Jong-Min Kim ◽  
Woo-Chan Lee ◽  
Won-Gu Hwang
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Emission Characteristics ◽  
Fluidized Bed Gasifier
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