Manoj Kumar Pandey^*, Petter Deinboll Jenssen

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Department of Environmental Sciences, Norwegian University of Life Sciences, As, Norway.
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Abstract: In urban and peri-urban areas of developing countries decentralized wastewater treatment using septic tanks as pretreatment is common. One challenge of decentralized wastewater treatment systems (DEWATS) is handling and utilization of the generated sludge. Sludge drying reed beds (SDRBs) are a robust method for dewatering and stabilization of sludge. Constructed wetlands (CWs) and SDRBs can be integrated to treat both wastewater and sludge. SDRBs require more area than most other sludge treatment options, but have low operational cost and energy requirements. The land area required for SDRB’s can be optimized by the selection of an appropriate loading rate, sludge application frequency and resting phase. This paper gives a review regarding the use of SDRB’s as well as presenting a pilot scale experiment comparing planted and unplanted sludge drying beds in Kathmandu. The planted beds showed a higher dewatering capability and higher reduction of volatile solids (VS). A short-term pilot-scale experiment can give valuable input to the design and operation of full-scale systems and for sub-tropical climate as that of Kathmandu Nepal, an initial sludge loading rate (SLR) of 100 kg total solids (TS)/m²/year is suggested with a gradual increase to up to 250 kg TS/m²/year.

Keywords: Sludge, Reeds, Dewatering, Evapotranspiration

Cite this paper: Pandey, M. and Jenssen, P. (2015) Reed Beds for Sludge Dewatering and Stabilization. Journal of Environmental Protection, 6, 341-350. doi: 10.4236/jep.2015.64034.

References

[1]   UN-Habitat (2011) Status and Strategy for Faecal Sludge Management in the Kathmandu Valley. Kathmandu, Nepal.

[2]   Nielsen, S. and Willoughby, N. (2005) Sludge Treatment and Drying Reed Bed Systems in Denmark. Water and Environment Journal, 19, 296-305.
http://dx.doi.org/10.1111/j.1747-6593.2005.tb00566.x

[3]   Nassar, A.M., Smith, M. and Afifi, S. (2006) Sludge Dewatering Using the Reed Bed System in the Gaza Strip, Pales tine. Water and Environment Journal, 20, 27-34.
http://dx.doi.org/10.1111/j.1747-6593.2005.00019.x

[4]   Kengne, I.M., Dodane, P.H., Akoa, A. and Kone, D. (2009) Vertical-Flow Constructed Wetlands as Sustainable Sanitation Approach for Faecal Sludge Dewatering in Developing Countries. Desalination, 248, 291-297.
http://dx.doi.org/10.1016/j.desal.2008.05.068

[5]   Uggetti, E., Ferrer, I., Nielsen, S., Arias, C., Brix, H. and Garcia, J. (2012) Characteristics of Biosolids from Sludge Treatment Wetlands for Agricultural Reuse. Ecological Engineering, 40, 210-216.
http://dx.doi.org/10.1016/j.ecoleng.2011.12.030

[6]   Uggetti, E., Ferrer, I., Llorens, E. and Garcia J. (2010) Sludge Treatment Wetlands: A Review on the State of the Art. Bioresource Technology, 101, 2905-2912.
http://dx.doi.org/10.1016/j.biortech.2009.11.102

[7]   Kim, B.J. and Smith, E.D. (1997) Evaluation of Sludge Dewatering Reed Beds: A Niche for Small Systems. Water Science and Technology, 35, 21-28.

[8]   Nielsen, S. (2003) Sludge Drying Reed Beds. Water Science and Technology, 48, 101-109.

[9]   Liénard, A. and Payrastre, F. (1996) Treatment of Sludge from Septic Tanks in a Reed-Bed Filters Pilot Plant. 5th International Conference on Wetland Systems for Water Pollution Control, Vienna, 1996.

[10]   Edwards, J.K., Gray, K.R., Cooper, D.J., Biddlestone, A.J. and Willoughby, N. (2001) Reed Bed Dewatering of Agricultural Sludges and Slurries. Water Science and Technology, 44, 551-558.

[11]   Lienard, A., Duchene, Ph. and Gorini, D. (1995) A Study of Activated Sludge Dewatering in Experimental Reed-Planted or Unplanted Sludge Drying Beds. Water Science and Technology, 32, 251-261.
http://dx.doi.org/10.1016/0273-1223(95)00626-5

[12]   Paing, J. and Voisin, J. (2005) Vertical Flow Constructed Wetlands for Municipal Wastewater and Septage Treatment in French Rural Area. Water Science and Technology, 51, 145-155.

[13]   Koottatep, T., Surinkul, N., Polprasert, C., Kamal, A.S.M., Kone, D., Montangero, A., Heinss, U. and Strauss, M. (2005) Treatment of Septage in Constructed Wetlands in Tropical Climate: Lessons Learnt from Seven Years of Operation. Water Science and Technology, 51, 119-126.

[14]   Jenssen, P.D., Jonasson, S.A. and Heistad, A. (2006) Naturbasert Rensing av avløpsvann: En kunnskapssammenstilling med hovedvekt pa norske erfaringer. b. Nr 2006-20. Svenskt Vatten, Stockholm, 65 s.: ill., fig. s.

[15]   Kadlec, R.H. and Wallace, S. (2008) Treatment Wetlands. CRC, Boca Raton.

[16]   Hellstrom, D. and Kvarnstrom, E. (1997) Natural Sludge Dewatering. I: Combination of Freezing, Thawing, and Drying as Dewatering Methods. Journal of Cold Regions Engineering, 11, 1-14.
http://dx.doi.org/10.1061/(ASCE)0887-381X(1997)11:1(1)

[17]   Martel, C.J. (1989) Development and Design of Sludge Freezing Beds. Journal of Environmental Engineering, 115, 799-808.
http://dx.doi.org/10.1061/(ASCE)0733-9372(1989)115:4(799)

[18]   Dominiak, D., Christensen, M.L., Keiding, K. and Nielsen, P.H. (2011) Sludge Quality Aspects of Full-Scale Reed Bed Drainage. Water Research, 45, 6453-6460.
http://dx.doi.org/10.1016/j.watres.2011.09.045

[19]   Koottatep, T., Oanh, N.T.K. and Polprasert, C. (1999) Preliminary Guidelines for Design and Operation of Constructed Wetlands Treating Septage. International Seminar on Constructed Wetlands: A Promising Technology for Septage Management and Treatment, AIT Centre, Bangkok, 15-17 March 1999, 15-17.

[20]   Koottatep, T., Polprasert, C., Oanh, N.T.K., Heinss, U., Montangero, A. and Strauss, M. (2001) Septage Dewatering in Vertical-Flow Constructed Wetlands Located in the Tropics. Water Science and Technology, 44, 181-188.

[21]   Cofie, O.O., Agbottah, S., Strauss, M., Esseku, H., Montangero, A., Awuah, E. and Kone, D. (2006) Solid-Liquid Separation of Faecal Sludge Using Drying Beds in Ghana: Implications for Nutrient Recycling in Urban Agriculture. Water Research, 40, 75-82.
http://dx.doi.org/10.1016/j.watres.2005.10.023

[22]   Al-Nozaily, F.A., Taher, T.M. and Al-Rawi, M.H.M. (2013) Evaluation of the Sludge Drying Beds at Sana’a Wastewater Treatment Plant. Seventeenth International Water Technology Conference, Istanbul, 5-7 November 2013.

[23]   Tchobanoglous, G. (1991) Wastewater Engineering: Treatment, Disposal and Reuse. 3rd Edition, Metcalf & Eddy, Inc., McGraw Hill.

[24]   Arceivala, S.J. and Asolekar, S.R. (2007) Wastewater Treatment for Pollution Control and Reuse. Tata McGraw-Hill Education, Noida.

[25]   Buseth, A.G., Nordgaard, E. and Jenssen, P.D. (1996) Biologisk slambehandling. Vann 31/1, 118-125.

[26]   Nielsen, S. (2007) Sludge Treatment and Drying Reed Bed Systems. Ecohydrology & Hydrobiology, 7, 223-234.
http://dx.doi.org/10.1016/S1642-3593(07)70105-2

[27]   Giraldi, D. and Iannelli, R. (2009) Short-Term Water Content Analysis for the Optimization of Sludge Dewatering in Dedicated Constructed Wetlands (Reed Bed Systems). Desalination, 246, 92-99.
http://dx.doi.org/10.1016/j.desal.2008.02.038

[28]   Koottatep, T., Polprasert, C., Oanh, N.T.K., Surinkul, N., Montangero, A. and Strauss, M. (2002) Constructed Wetlands for Septage Treatment—Towards Effective Faecal Sludge Management. In: Proceedings, 8th International Conference on Wetlands Systems for Water Pollution Control, IWA/University of Dar es Salaam, Arusha, 16-19 September 2002, 16-19.

[29]   APHA (1985) Standard Method for the Examination of Water and Wastewater. 16th Edition, American Public Health Association, Washington DC.

[30]   Nayava, J. (1980) A Topoclimatological Investigation of Solar Radiation in the Kathmandu Valley, Nepal. Proceedings of Tenth New Zealand Geography Conference and Forty-Ninth ANZAAS Congress (Geographical Sciences), Auckland, January 1979, 33-38.

[31]   Heinss, U., Larmie, S.A. and Strauss, M. (1998) Solids Separation and Pond System for the Treatment of Septage and Public Toilets Sludges in Tropical Climate—Lessons Learnt and Recommendations for Preliminary Design. EAWAG/ SANDEC Report No. 05/98.

[32]   Koottatep, T., Polprasert, C. and Hadsoi, S. (2006) Integrated Faecal Sludge Treatment and Recycling through Constructed Wetlands and Sunflower Plant Irrigation. Water Science and Technology: A Journal of the International Association on Water Pollution Research, 54, 155-164.
http://dx.doi.org/10.2166/wst.2006.846

[33]   Nielsen, S. (2011) Sludge Treatment Reed Bed Facilities—Organic Load and Operation Problems. Water Science and Technology, 63, 942-948.
http://dx.doi.org/10.2166/wst.2011.273

[34]   Lance, J.C. (1972) Nitrogen Removal by Soil Mechanisms. Journal of the Water Pollution Control Federation, 44, 1352-1361.

[35]   De Maeseneer, J.L. (1997) Constructed Wetlands for Sludge Dewatering. Water Science and Technology, 35, 279-285.
http://dx.doi.org/10.1016/S0273-1223(97)00080-2

[36]   Stefanakis, A.I. and Tsihrintzis, V.A. (2012) Effect of Various Design and Operation Parameters on Performance of Pilot-Scale Sludge Drying Reed Beds. Ecological Engineering, 38, 65-78.
http://dx.doi.org/10.1016/j.ecoleng.2011.10.003

[37]   Vincent, J., Forquet, N., Molle, P. and Wisniewski, C. (2012) Mechanical and Hydraulic Properties of Sludge Deposit on Sludge Drying Reed Beds (SDRBs): Influence of Sludge Characteristics and Loading Rates. Bioresource Technology, 116, 161-169.
http://dx.doi.org/10.1016/j.biortech.2012.04.023

[38]   Mara, D.D. and Cairncross, S. (1989) Guidelines for the Safe Use of Wastewater and Excreta in Agriculture and Aquaculture: Measures for Public Health Protection. WHO Publication, Geneva.

[39]   Troesch, S., Lineard, A., Molle, P., Merlin, G. and Esser, D. (2009) Treatment of Septage in Sludge Drying Reed Beds: A Case Study on Pilot-Scale Beds. Water Science and Technology, 60, 643-653.
http://dx.doi.org/10.2166/wst.2009.389

[40]   Uggetti, E., Llorens, E., Pedescoll, A., Ferrer, I., Castellnou, R. and Garcia, J. (2009) Sludge Dewatering and Stabilization in Drying Reed Beds: Characterization of Three Full-Scale Systems in Catalonia, Spain. Bioresource Technology 100, 3882-3890.
http://dx.doi.org/10.1016/j.biortech.2009.03.047