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Drainage Bed: A Natural System for WTP Sludge Dewatering and Drying with Different Coagulant Chemicals in Tropical Countries

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DOI: 10.4236/jwarp.2014.611097    4,010 Downloads   4,421 Views   Citations

ABSTRACT

This study seeks to evaluate the mechanisms for dewatering sludge from Water Treatment Plants (WTP) in a natural system that uses nonwoven polyester geotextile blankets named Drainage Bed (DB). Dewatering mechanisms are divided into two stages: Drainage and Drying Phases. For the Drainage Phase, the results showed that the solids content of the Aluminum Sulfate sludge reached 8.9% to 18.3% and the PACl sludge 1.8% to 6.5%, the volume reduction on this phase exceeding 50% and 74%, respectively. The final solids content, after the Drying Phase, was greater than 28%, reaching 90%. In the Drainage Phase the lower the Surface Application Rate—SAR [kg/m2] is, the greater the drainage flow will be. In the Drying Phase, moisture and insolation were key factors in drying sludge. Thus, the Drying Phase in the DB takes special attention for being virtually nonexistent in dewatering technologies in a closed system (confined) without exposure to solar energy. The use of the DB as a natural system for dewatering WTP sludge in tropical countries proved to be a promising alternative, because of its efficient removal of water from sludge coupled with operational simplicity and low costs, provided there is area available.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Barroso, M. , Achon, C. , Reis, R. and Cordeiro, J. (2014) Drainage Bed: A Natural System for WTP Sludge Dewatering and Drying with Different Coagulant Chemicals in Tropical Countries. Journal of Water Resource and Protection, 6, 1029-1036. doi: 10.4236/jwarp.2014.611097.

References

[1] Brasil (1997) Presidencia da Republica Federativa do Brasil. Legislacao Federal Brasileira. Lei 9.433 de 1997.
[2] Brasil (1998) Presidencia da Republica Federativa do Brasil. Legislacao Federal Brasileira. Lei 9.605 de 1998.
[3] Achon, C.L., Barroso, M.M. and Cordeiro, J.S. (2012) Geracao e destinacao de lodos de estacoes de tratamento de Agua na Sub-bacia do Rio Piracicaba—Brasil. In: XV Simposio Luso-Brasileiro de Engenharia SanitAria e Ambiental (SILUBESA), Anais, ABRH, Minas Gerais, Belo Horizonte, Brasil, I-017, 10p.
[4] Achon, C.L. (2008) Ecoeficiencia de Sistemas de Tratamento de Agua a luz dos conceitos da ISO 14.001. Tese (Doutorado)—Escola de Engenharia de Sao Carlos, Universidade de Sao Paulo. Sao Carlos, 230p.
[5] Cordeiro, J.S., Barroso, M.M. and Achon, C.L. (2011) Residuos de estacoes de tratamento de Agua e a saude ambiental. In: 7th Jornadas Tecnicas Internacionais de Residuos—Energia dos Residuos, Anais, APESB e ISWA, Instituto Superior de Engenharia do Porto, Porto, Portugal, Cod. 005, 13p.
[6] Hubbs, S.A. and Pavoni, J.L. (1974) Opimization of Sludge Dewater Ability in Sludge—Disposal Lagoa. JAWWA, Denver, 66, 658-663.
[7] Cornwell, D.A., et al. (1987) Handbook Water Treatment Plant Waste Management. AWWA, Research Foundation, Denver, 431p.
[8] American Water Works Association; American Society of Civil Engineers; U.S. Enviromental Protection Agency (1996) Management of Water Treatment Plant Residuals. American Society of Civil Engineers, New York.
[9] Cordeiro, J.S. (2001) Processamento de Lodos de Estacoes de Tratamento de Agua (ETAs). In: Andreoli, C.V., Coord., Residuos Solidos do Saneamento: Processamento, Reciclagem e disposicao final, Projeto PROSAB 2, Rio de Janeiro: RiMa, ABES, 282p, Cap. 5, 121-142.
[10] Cordeiro, J.S. (1993) O Problema dos Lodos Gerados nos Decantadores em Estacoes de Tratamento de Agua. Sao Carlos. Tese (Doutorado)—Escola de Engenharia de Sao Carlos, Universidade de Sao Paulo, Sao Paulo.
[11] Sampaio, R.M.B., Vidal, D. and Urashima, D.C. (2000) Simulacao do processo de carreamento e retencao de particulas em filtros texteis. In: VI ENCITA 6rd Encontro de Iniciacao Cientifica e Pos-graduacao do ITA, Sao Jose dos Campos.
[12] Freitas, R.A.S. (2003) Comportamento de geotexteis como filtro em residuos—Fosfogesso e Lama vermelha. Dissertacao (mestrado). COPPE/Universidade Federal do Rio de Janeiro, Rio de Janeiro, 122p.
[13] Urashima, D.C. and Vidal, D. (1995) Dimensionamento por teoria probabilistica de filtros em geotextil nao tecido. In: II Simposio Brasileiro sobre Aplicacao de Geossinteticos, Sao Paulo, 267-276.
[14] John, N.W.M. (1987) Geotextiles. Blackie, Glasgow; Chapman and Hall, New York, 347p.
[15] Vesilind, P.A. and Hsu, C.C. (1997) Limits of Sludge Dewatering. Water Science Technology, 36, 87-91.
http://dx.doi.org/10.1016/S0273-1223(97)00673-2
[16] Smollen, M. and Kafaar, A. (1994) Electroosmotically Enhanced Sludge Dewatering: Pilot-Plant Study. Water Science Technology, 30, 159-168.
[17] David, A.C. (2002) Secagem Termica de lodos de esgoto: Determinacao da umidade de equilibrio. Sao Paulo. Dissertacao (Mestrado), Escola Politecnica da Universidade de Sao Paulo, Sao Paulo, 151p.
[18] Achon, C.L. and Cordeiro, J.S. (2004) AnAlise Critica da Implantacao de Sistemas Naturais de Remocao de volume de lodo de ETA. In: XXIX Congresso Interamericano de Engenharia SanitAria e Ambiental (AIDIS), Anais, San Juan-Porto Rico, cd, I-Achon-Brasil-1.
[19] Fontana, A.O. (2004) Sistema de Leito de Drenagem e Sedimentador como solucao para reducao de volume de lodo de decantadores e reuso da Agua de lavagem de filtros—Estudo de Caso—ETA Cardoso. Dissertacao (Mestrado), Universidade Federal de Sao Carlos/UFSCar, Sao Carlos.

  
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