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Na, Wei
- Utilization of Portland Cement and Municipal Solid Waste Incineration Fly Ash for Solidification/Stabilization of Sewage Sludge
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Authors
Wei Na
1
Affiliations
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, CN
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan 430023, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 1 (2015), Pagination: 141-144Abstract
A solidification/stabilization (S/S) process by using municipal solid waste incineration (MSWI) fly ash was applied to sewage sludge in order to find a safer way for the two wastes (sewage sludge and MSWI fly ash) disposal. The behaviour of pastes fabricated with various mass ratios of Portland cement/MSWI fly ash has been analysed in terms of mechanical strength, microstructure and leaching characteristics. The results showed that the unconfined compression strength (UCS) of solidified sludge decreased with the mixing amount of MSWI fly ash. However, with the addition of 5% MSWI fly ash represented 28 days UCS of 0.31 MPa, satisfying the landfill threshold of 0.3MPa. Scanning electron microscopy investigations revealed that a large amount of ettringite was present in solidified sludge, leading to a crystallizing network in the solidified products, and therefore, the enhancement of the strength. Environmental assessment of the final products in compliance leaching tests demonstrated that the concentration of heavy metals was below the detection limits.Keywords
Sewage Sludge, Municipal Solid Waste, Incineration Fly Ash, Solidification/Stabilization.- Production of Sludge Ceramsite from Sewage Sludge, Municipal Solid Waste Incineration Fly Ash and Clay
Abstract Views :109 |
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Authors
Wei Na
1
Affiliations
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 1 (2015), Pagination: 153-156Abstract
The few reuses and large stockpile of sewage sludge led to a series of social and environmental problems. This study investigated the possibility of using the sewage sludge and municipal solid waste incineration (MSWI) fly ash as materials to prepare ceramsite by a high temperature sintering process. Two experiments were designed to investigate the addition of sewage sludge and MSWI and sintering treatment. The result showed that the mass ratio of sewage sludge to MSWI fly ash was 8:2 and the the pellets, sintered at 1080°C for 8 min, were beneficial to produce sludge ceramsite. Property tests of sludge ceramsite showed that sludge ceramsite was light (with an apparent density of 680kg/m3), waterproof (with a water absorption of 6.7%), hard (with a compressive strength of 5.4Mpa) and nontoxic (contents of toxic metal leaching test were found to be within the limits of China's regulatory requirement). These results reveal the feasibility of recycling sewage sludge and MSWI fly ash by sintering as a construction material.Keywords
Sewage Sludge, Municipal Solid Waste, Incineration Fly Ash, Sintering, Sludge Ceramsite.- Effects of Combined Pretreatment of Sewage Sludge on Biogas Production in Anaerobic Digestion Process
Abstract Views :96 |
PDF Views:0
Authors
Wei Na
1
Affiliations
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 4 (2017), Pagination: 1267-1270Abstract
Biogas recovery by anaerobic digestion was seen as an ideal way to treat biomass waste-sewage sludge, but has some limitations, such as the low efficient biogas production. In this paper, the combined (alkaline and ultrasonic) pretreatment was proposed for effective sludge anaerobic digestion and the effect of these pretreatments was investigated. It can be seen that this treatment effectively led to the increase of soluble chemical oxygen demand (SCOD) and volatile fatty acids (VFA) concentration. The high concentration of VFA led to an increase in biogas production. Under the optimum combined pretreatment condition (under 6000 kJ/kg TS and with 0.15 mol/L NaOH), the biogas production was nearly 8 times higher than the raw sample. Besides, the SV of sludge was reduced and the settling characteristics of sludge were improved. The results indicated that the combined pretreatment could be an effective method for improving biogas yield.Keywords
Sewage Sludge, Anaerobic Digestion, Biogas Production, Combined Pretreatment.- Impact of Ultrasonication-Ozonation Pretreatment on Anaerobic Digestion of Sewage Sludge
Abstract Views :401 |
PDF Views:0
Authors
Wei Na
1
Affiliations
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 2 (2018), Pagination: 539-542Abstract
The increase in the number of wastewater treatment plants and the sewage sludge makes it necessary to improve the efficiency of anaerobic digestion of sludge. Pretreatment of sewage sludge has shown important advantages in the sludge anaerobic digestion. This study investigated the effect of using ultrasonication-ozonation pretreatment on the anaerobic digestion process. It can be seen that this treatment effectively led to the increase of soluble chemical oxygen demand (SCOD). The optimal specific energy input was 6000 kJ/kg TS and the ozonation dosage was 0.10 g O3/g TS. Under the optimum combined pretreatment condition, the biogas production was nearly 4-8 times than the raw sludge sample. It could be concluded that the combined pretreatment of sludge improved the anaerobic digestion of the sewage sludge.Keywords
Sewage Sludge, Anaerobic Digestion, Biogas Production, Combined-Pretreatment.References
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- APHA, AWWA, WPCF, 1998. Standard Methods for the Examination of Water and Wastewater. Twentieth ed., American Public Health Association, Washington D.C.
- Braguglia, C.M., Gagliano, M.C. and Rossetti, S. 2012. High frequency ultrasound pretreatment for sludge anaerobic digestion: Effect on floc structure and microbial population. Bioresource Technol., 110: 43-49.
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- Production of Lightweight Aggregates from Sewage Sludge and Dredged Sediment
Abstract Views :382 |
PDF Views:0
Authors
Wei Na
1
Affiliations
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
1 School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 2 (2018), Pagination: 575-578Abstract
In order to solve disposal problems of solid wastes, sewage sludge from wastewater treatment plants was mixed with dredged sediment to be recycled into lightweight aggregate through sintering process. The effect of sintering temperature, sintering time and mass ratio of sewage sludge to dredged sediment on characteristics of the aggregate were investigated to optimize the lightweight aggregate production process. Experimental results show that the optimal sintering temperature and time were 1150°C and 10 min respectively, and the optimal mass ratio of sewage sludge to dredged sediment was 7:3. It is concluded that sintering temperature and time, and sewage sludge/dredged sediment have a significant effect on the characteristics of lightweight aggregate.Keywords
Sewage Sludge, Dreged Sediment, Lightweight Aggregate.References
- China EPA 1998a. Lightweight Aggregates and its Test Methods. Part 1. Lightweight Aggregates (GB/T 17431.1-1998). China Environmental Science Press, Beijing.
- China EPA 1998b. Lightweight Aggregates and its Test Methods. Part 2. Test Methods for Lightweight Aggregates (GB/T 17431.21998). China Environmental Science Press, Beijing.
- China EPA 1997. Test Method Standard for Leaching Toxicity of Solid Wastes-horizontal Vibration Extraction Procedure (GB5086.2-1997). China National Standard Press, Beijing.
- Dai, X.H., Xu, Y. and Dong, B. 2017. Effect of the micron-sized silica particles (MSSP) on biogas conversion of sewage sludge. Water Res., 15: 220-228.
- Huang, C.H. and Wang, S.Y. 2013. Application of water treatment sludge in the manufacturing of lightweight aggregate. Constr. Build. Mater., 43: 174-183.
- Jin, H.M., Arazo, R.O., Gao, J., Capareda, S. and Chang, Z.Z. 2014. Leaching of heavy metals from fast pyrolysis residues produced from different particle sizes of sewage sludge. Janal. Appl. Pyrol., 109: 168-175.
- Lau, P.C., Teo, D.C.L. and Mannan, M.A. 2017. Characteristics of lightweight aggregate produced from lime-treated sewage sludge and palm oil fuel ash. Constr. Build. Mater., 152: 558-567.
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- Lu, C.H., Chen, J.C., Chuang, K.H. and Wey, M.Y. 2015. The different properties of lightweight aggregates with the fly ashes of fluidized-bed and mechanical incinerators. Constr. Build. Mater., 101: 380-388.
- Ren, J.Z., Liang, H.W., Dong, L., Gao, Z.Q., He, C., Pan, M. and Sun, L. 2017. Sustainable development of sewage sludge-to-energy in China: Barriers identification and technologies prioritization. Renew. Sust. Energ. Rev., 67: 384-396.
- Smith, K.M., Fowler, G.D., Pullket, S. and Grahamet, N.J.D. 2009. Sewage sludge-based adsorbents: a review of their production, properties and use in water treatment applications. Water Res., 43: 2569-2594.
- Syed, S.A., Hassan, S., Wang, Y., Hu, S., Su, S. and Xiang, J. 2017. Thermochemical processing of sewage sludge to energy and fuel: Fundamentals, challenges and considerations. Renew. Sust. Energ. Rev., 80: 888-913.
- Tuan, B.L., Hwang, C.L., Lin, K.L., Chen, Y.Y. and Young, M.P. 2013. Development of lightweight aggregate from sewage sludge and waste glass powder for concrete. Constr. Build. Mater., 47: 334-339.
- Wang, X.R., Jin, Y.Y., Wang, Z.Y., Nie, Y.F., Huang, Q.F. and Wang, Q. 2009. Development of lightweight aggregate from dry sewage sludge and coal ash. Water. Manage., 29: 1330-1335.
- Werle, S. and Wilk, R.K. 2010. A review of methods for the thermal utilization of sewage sludge: the polish perspective. Renew. Energy., 35: 1914-1919.
- Zhang, Q.W. and Kano, J.Y. 2016. A new approach for hydrogen generation from sewage sludge. Bioresource Technol., 201: 191-194.