Preparation, characterization of sludge adsorbent and investigations on its removal of hydrogen sulfide under room temperature

Abstract

To recycle the sludge resource from sewage treatment plants and solve the problem of odor pollution, the sludge was converted into an adsorbent by carbonized pyrolysis and the process was optimized by orthogonal experiments. The capability for odor removal as well as the structure of the adsorbent was studied with H₂S as a target pollutant. The results indicate that the main factor affecting the deodorization performance of the adsorbent is the activating time. The sludge adsorbent sample SAC1 prepared under optimum conditions exhibits the best deodorization performance with a H₂S breakthrough time of 58 min and an iodine value nearly that of the coal activated carbon. The breakthrough time of H₂S is much longer than that on the coal activated carbon. On the other hand, characterization results from X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS) and scanning electron microscope (SEM) techniques show that SAC1 is composed of mainly graphite carbon with lower oxygen content on the surface. The bulk of SAC1 exhibits a honeycomb structure with well developed porosity and a high specific surface area of 120.47 m²·g^-1, with the average pore diameter being about 5 nm. Such a structure is in favor of H₂S adsorption. Moreover, SAC1 is detected to contain various metal elements such as Zn, Fe, Mg, etc., leading to a superior deodorization property to that of coal activated carbon.

Keywords

orthogonal experiment / sludge adsorbent / hydrogen sulfide

References

[1] Lebrero R, Bouchy L, Stuetz R, Munoz R. Odor assessment and management in wastewater treatment plants: a review. Critical Reviews in Environmental Science and Technology, 2011, 41(10): 915-950

[2] Souza C L, Chernicharo C A L, Melo G C B. Methane and hydrogen sulfide emissions in UASB reactors treating domestic wastewater. Water Science and Technology, 2012, 65(7): 1229-1237

[3] Asadi S, Pakizeh M, Pourafshari Chenar M. An investigation of reaction furnace temperatures and sulfur recovery. Frontiers of Chemical Science and Engineering, 2011, 5(3): 362-371

[4] Chandrasekara Pillai K, Raju T, Chung S J, Moon I I S. Removal of H₂S using a new Ce(IV) redox mediator by a mediated electrochemical oxidation process. Journal of Chemical Technology and Biotechnology (Oxford, Oxfordshire), 2009, 84(3): 447-453

[5] Fang H B, Zhao J T, Fang Y T, Huang J J, Yang W. Selective oxidation of hydrogen sulfide to sulfur over activated carbon-supported metal oxides. England: Fuel, 2013, 108: 143-148

[6] Shareefdeen Z, Herner B, Wilson S. Biofiltration of nuisance sulfur gaseous odors from a meat rendering plant. Journal of Chemical Technology and Biotechnology (Oxford, Oxfordshire), 2002, 77(12): 1296-1299

[7] Li B, Zhang C L, Zhao Y C. Sludge Characterization and Preprocessing Technology. Beijing: Metallurgical Industry Press, 2010, 1-3 (in Chinese)

[8] Kelessidis A, Stasinakis A S. Comparative study of the methods used for treatment and final disposal of sewage sludge in European countries. Waste Management, 2012, 32(6): 1186-1195

[9] Rozada F, Otero M, Morán A, García A I. Adsorption of heavy metals onto sewage sludge-derived materials. Bioresource Technology, 2008, 99(14): 6332-6338

[10] Yu L L, Zhong Q. Preparation of adsorbents made from sewage sludges for adsorption of organic materials from wastewater. Journal of Hazardous Materials, 2006, 137(1): 359-366

[11] Wen Q B, Li C T, Cai Z H, Zhang W, Gao H L, Chen L J, Zeng G M, Shu X, Zhao Y P.Study on activated carbon derived from sewage sludge for adsorption of gaseous formaldehyde. Bioresource Technology, 2011, 102(2): 942-947

[12] Bashkova S, Bagreev A, Locke D C, Bandosz T J. Adsorption of SO₂ on sewage sludge-derived materials. Environmental Science and Technology, 2001, 35(15): 3263-3269

[13] Zhai Y B, Wei X, Zeng G, Zhang D. Effects of metallic derivatives in adsorbent derived from sewage sludge on adsorption of sulfur dioxide. Journal of Central South University of Technology, 2004, 11(1): 55-58

[14] Ros A, Montes-Moran M A, Fuente E, Nevskaia D M, Martin M J. Dried sludges and sludge-based chars for HS removal at low temperature: influence of sewage sludge characteristics. Environmental Science and Technology, 2006, 40(1): 302-309

[15] Bagreev A, Bashkova S, Locke D C, Bandosz T J. Sewage sludge-derived materials as efficient adsorbents for removal of hydrogen sulfide. Environmental Science and Technology, 2001, 35(7): 1537-1543

[16] Bandosz T J, Block K. Effect of pyrolysis temperature and time on catalysis performance of sewage sludge/industrial sludge-based composite adsorbents. Applied Catalysis B: Environmental, 2006, 67(1-2): 77-85

[17] Seredych M, Strydom C, Bandosz T J. Effect of fly ash addition on the removal of hydrogen sulfide from biogas and air on sewage sludge-based composite adsorbents. Waste Management (New York, N.Y.), 2008, 28(10): 1983-1992

[18] Bandosz T J. Removal of hydrogen sulphide on sewage sludge/industrial sludge based carbonaceous adsorbents. International Journal of Environment and Waste Management, 2009, 3(3/4): 308-318

[19] Bagreev A, Bandosz T J. On the mechanism of hydrogen sulfide removal from moist air on catalytic carbonaceous adsorbents. Industrial & Engineering Chemistry Research, 2005, 44(3): 530-538

[20] Lin Q H, Cheng H, Chen G Y. Preparation and characterization of carbonaceous adsorbents from sewage sludge using a pilot-scale microwave heating equipment. Journal of Analytical and Applied Pyrolysis, 2012, 93: 113-119

[21] Chen W, Wang X Q, Ning P, Jiang M, Liu W, Long J, Xiu J. Preparation of modified activated carbon and its purification properties for CS₂ in yellow phosphorus off-gas. Journal of Central South University :Science and Technology, 2012, 43(7): 2869-2876 (in Chinese)

[22] lohse B H, Calka A, Wexler D. Effect of starting composition on the synthesis of nanocrystalline TiC during milling of titanium and carbon. Journal of Alloys and Compounds, 2005, 394(1-2): 148-151

[23] Liu S X, Sun J. Carbon sphere/activated carbon composite materials prepared by solvothermal method. Journal of Inorganic Materials, 2009, 24(6): 1132-1136 (in Chinese)

Acknowledgements

This research was supported by the Open Project of State Key Laboratory of Urban Water Resource and Environment (No.QA201011). The authors also acknowledge the Support of Technological innovation for special funds of Harbin (No. 2010RFQXS046).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg