Rubber and methane recovery from deproteinized natural rubber wastewater by coagulation pre-treatment and anaerobic treatment

M. Hatamoto, H. Nagai, S. Sato, M. Takahashi, S. Kawakami, P. K. Choeisai, S. Syutsubo, A. Ohashi, T. Yamaguchi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A newly developed natural rubber deproteinization process produces deproteinized natural rubber (DPNR) wastewater as an intermediate product containing a high concentration of sodium dodecyl sulfate (SDS) and rubber. In this study, a novel process to recover the residual rubber and energy as methane from DPNR wastewater was developed. As a pretreatment, SDS and residual rubber in DPNR wastewater were coagulated and recovered by addition of CaCl2 at Ca2+/SDS and Ca2+/rubber mass ratios of 0.070 and 0.055, respectively. The remaining organic matter in the pre-treated DPNR wastewater was converted to methane by using a mesophilic up-flow anaerobic sludge bed (UASB) reactor. The UASB reactor with the diluted pre-treated DPNR wastewater showed a total chemical oxygen demand (COD) removal efficiency of 92 ± 2% at a maximum loading rate of 6.8 ± 1.8 kgCOD·m-3·d-1 at a hydraulic retention time (HRT) of 12 h. Under the condition of effluent recirculation with raw pre-treated DPNR wastewater, the UASB reactor showed a total COD removal efficiency of 84 ± 8% at the maximum loading rate of 6.4 ± 1.7 kgCOD·m-3·d-1 at HRT of 39 h. The results suggest that the newly developed resource recovery process for DPNR wastewater could be a promising treatment system.

Original languageEnglish
Pages (from-to)577-584
Number of pages8
JournalInternational Journal of Environmental Research
Volume6
Issue number3
Publication statusPublished - 2012 Jul 23

Keywords

  • Anaerobic treatment
  • Latex wastewater
  • Natural rubber
  • Rubber recovery
  • Sodium dodecyl sulfate (SDS)

ASJC Scopus subject areas

  • Environmental Science(all)

Fingerprint Dive into the research topics of 'Rubber and methane recovery from deproteinized natural rubber wastewater by coagulation pre-treatment and anaerobic treatment'. Together they form a unique fingerprint.

  • Cite this

    Hatamoto, M., Nagai, H., Sato, S., Takahashi, M., Kawakami, S., Choeisai, P. K., Syutsubo, S., Ohashi, A., & Yamaguchi, T. (2012). Rubber and methane recovery from deproteinized natural rubber wastewater by coagulation pre-treatment and anaerobic treatment. International Journal of Environmental Research, 6(3), 577-584.