scholarly journals Hydrogen-Rich Syngas Production from Gasification and Pyrolysis of Solar Dried Sewage Sludge: Experimental and Modeling Investigations

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Aïda Ben Hassen Trabelsi ◽  
Amina Ghrib ◽  
Kaouther Zaafouri ◽  
Athar Friaa ◽  
Aymen Ouerghi ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Moisture Content ◽  
Fixed Bed ◽  
Solar Drying ◽  
Downdraft Gasifier ◽  
Gaseous Products ◽  
Syngas Production ◽  
High Heating ◽  
Combustible Gases ◽  
Stoichiometric Models

Solar dried sewage sludge (SS) conversion by pyrolysis and gasification processes has been performed, separately, using two laboratory-scale reactors, a fixed-bed pyrolyzer and a downdraft gasifier, to produce mainly hydrogen-rich syngas. Prior to SS conversion, solar drying has been conducted in order to reduce moisture content (up to 10%). SS characterization reveals that these biosolids could be appropriate materials for gaseous products production. The released gases from SS pyrolysis and gasification present relatively high heating values (up to 9.96 MJ/kg for pyrolysis and 8.02  9.96 MJ/kg for gasification) due to their high contents of H2 (up to 11 and 7 wt%, resp.) and CH4 (up to 17 and 5 wt%, resp.). The yields of combustible gases (H2 and CH4) show further increase with pyrolysis. Stoichiometric models of both pyrolysis and gasification reactions were determined based on the global biomass formula, CαHβOγNδSε, in order to assist in the products yields optimization.

Co-gasification of sewage sludge and woody biomass in a fixed-bed downdraft gasifier: Toxicity assessment of solid residues

2015 ◽  
Vol 36 ◽  
pp. 241-255 ◽  
Author(s):  
Le Rong ◽  
Thawatchai Maneerung ◽  
Jingwen Charmaine Ng ◽  
Koon Gee Neoh ◽  
Boon Huat Bay ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Fixed Bed ◽  
Woody Biomass ◽  
Toxicity Assessment ◽  
Downdraft Gasifier

Investigation of the Effects of Hygienization and Moisture Content of Sewage Sludge on Pyrolysis Products

2014 ◽  
Vol 926-930 ◽  
pp. 4263-4271 ◽  
Author(s):  
Adela Hlavsová ◽  
Agnieszka Corsaro ◽  
Helena Raclavská
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Moisture Content ◽  
Thermal Behavior ◽  
Pyrolysis Temperature ◽  
Wastewater Treatment Plants ◽  
Total Yield ◽  
Pyrolysis Products ◽  
Gaseous Products ◽  
Temperature Heating

The effects of hygienization and moisture content on pyrolysis of sewage sludge obtained from wastewater treatment plants were examined in this study. The sewage sludge samples with CaO, without CaO, dry and wet (70 wt.% moisture) were used. The pyrolysis experiments were conducted in two reactor setups at 750 °C and 850 °C. The effect of pyrolysis temperature, heating rate on the gaseous pyrolysis products as well as thermal behavior of sewage sludge were investigated. The CaO addition increased the total yield of pyrolysis gaseous products, whereas moisture significantly increased CO2 production as well as CO and CH4.

Co-gasification of woody biomass and sewage sludge in a fixed-bed downdraft gasifier

AIChE Journal ◽  
2015 ◽  
Vol 61 (8) ◽  
pp. 2508-2521 ◽  
Author(s):  
Zhehan Ong ◽  
Yongpan Cheng ◽  
Thawatchai Maneerung ◽  
Zhiyi Yao ◽  
Yen Wah Tong ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Fixed Bed ◽  
Woody Biomass ◽  
Downdraft Gasifier

EFFECT OF MOISTURE AND PARTICLE SIZE ON THE COMBUSTION CHARACTERISTICS OF SEWAGE SLUDGE IN A FIXED BED

2018 ◽  
Author(s):  
Joana Freitas Campana ◽  
Kaio Pandolfi Pessotti ◽  
Carlos Eduardo Silva Abreu ◽  
Patrick de Jesus
Keyword(s):  
Particle Size ◽  
Sewage Sludge ◽  
Fixed Bed ◽  
Combustion Characteristics ◽  
Effect Of Moisture

Estimation of Energy Saving for Melting Process on Sewage Sludge

1991 ◽  
Vol 23 (10-12) ◽  
pp. 2011-2018 ◽  
Author(s):  
T. Murakami ◽  
K. Sasabe ◽  
K. Sasaki ◽  
T. Kawashima
Keyword(s):  
Sewage Sludge ◽  
Moisture Content ◽  
Energy Saving ◽  
Fuel Consumption ◽  
Melting Process ◽  
System Operation ◽  
Operational Conditions ◽  
Volatile Solids ◽  
Cake Moisture ◽  
Very High

The possible volume reduction and stabilization of the sewage sludge associated with the melting process are expected to be greater than with the incineration process. In addition, melted slag can be utilized. However, since the melting process requires a very high temperature to melt inorganics (ash) in the sludge, the technologies to minimize energy consumption, to establish system operation and to prolong durability of facilities should be developed. This paper discusses the auxiliary fuel consumption as follows.(1)Preparation of a model that provides the auxiliary fuel consumption of the melting system on the basis of the mass and heat balances.(2)Evaluation of the auxiliary fuel consumption in the above model using the cake moisture content, the volatile solids of the cake, the dried cake moisture content and the melting temperature as parameters.(3)Examination of the operational conditions for an energy saving melting system based on the results of (1) and (2) above.

scholarly journals Gasification and Power Generation Characteristics of Rice Husk, Sawdust, and Coconut Shell Using a Fixed-Bed Downdraft Gasifier

2021 ◽  
Vol 13 (4) ◽  
pp. 2027
Author(s):  
Md. Emdadul Hoque ◽  
Fazlur Rashid ◽  
Muhammad Aziz
Keyword(s):  
Rice Husk ◽  
Fixed Bed ◽  
Cost Effective ◽  
Coconut Shell ◽  
Energy Sources ◽  
Airflow Rate ◽  
Gas Generation ◽  
Biomass Feedstocks ◽  
Downdraft Gasifier ◽  
Synthetic Gas

Synthetic gas generated from the gasification of biomass feedstocks is one of the clean and sustainable energy sources. In this work, a fixed-bed downdraft gasifier was used to perform the gasification on a lab-scale of rice husk, sawdust, and coconut shell. The aim of this work is to find and compare the synthetic gas generation characteristics and prospects of sawdust and coconut shell with rice husk. A temperature range of 650–900 °C was used to conduct gasification of these three biomass feedstocks. The feed rate of rice husk, sawdust, and coconut shell was 3–5 kg/h, while the airflow rate was 2–3 m3/h. Experimental results show that the highest generated quantity of methane (vol.%) in synthetic gas was achieved by using coconut shell than sawdust and rice husk. It also shows that hydrogen production was higher in the gasification of coconut shell than sawdust and rice husk. In addition, emission generations in coconut shell gasification are lower than rice husk although emissions of rice husk gasification are even lower than fossil fuel. Rice husk, sawdust, and coconut shell are cost-effective biomass sources in Bangladesh. Therefore, the outcomes of this paper can be used to provide clean and economic energy sources for the near future.

Syngas Production from Two-Stage Sorption-Enhanced Steam Gasification of Sewage Sludge over Bifunctional Ni-Ca Catalyst

2021 ◽  
Vol 35 (6) ◽  
pp. 4997-5005
Author(s):  
Xiaoxia Yang ◽  
Shengshen Gu ◽  
Amanj Kheradmand ◽  
Yijiao Jiang
Keyword(s):  
Sewage Sludge ◽  
Steam Gasification ◽  
Two Stage ◽  
Syngas Production

Experimental Parameter Study on Synthesis Gas Production by Steam-Oxygen Fluidized Bed Gasification of Sewage Sludge

2021 ◽  
Vol 11 (2) ◽  
pp. 579
Author(s):  
Max Schmid ◽  
Selina Hafner ◽  
Günter Scheffknecht
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Experimental Parameter ◽  
Space Velocity ◽  
Phosphate Fertilizer ◽  
Gas Production ◽  
Raw Material ◽  
Parameter Study ◽  
Syngas Production ◽  
Fuels And Chemicals

The conversion of biogenic residues to fuels and chemicals via gasification and synthesis processes is a promising pathway to replace fossil carbon. In this study, the focus is set on sewage sludge gasification for syngas production. Experiments were carried out in a 20 kW fuel input bubbling fluidized bed facility with steam and oxygen as gasification agent. In-situ produced sewage sludge ash was used as bed material. The sensitivity of the key operation parameters gasifier temperature, oxygen ratio, steam to carbon ratio, and the space velocity on the syngas composition (H2, CO, CO2, CH4, CxHy, H2S, COS, NH3, and tars) was determined. The results show that the produced syngas has high H2 and CO concentrations of up to 0.37 m3 m−3 and 0.18 m3 m−3, respectively, and is thus suitable for synthesis of fuels and chemicals. By adjusting the steam to carbon ratio, the syngas’ H2 to CO ratio can be purposely tailored by the water gas shift reaction for various synthesis products, e.g., synthetic natural gas (H2/CO = 3) or Fischer–Tropsch products (H2/CO = 2). Also, the composition and yields of fly ash and bed ash are presented. Through the gasification process, the cadmium and mercury contents of the bed ash were drastically reduced. The ash is suitable as secondary raw material for phosphorous or phosphate fertilizer production. Overall, a broad database was generated that can be used for process simulation and process design.

Sign in / Sign up

Export Citation Format

Share Document