Effect of hydraulic retention times on the performance of a partially packed upflow anaerobic fixed film system in the treatment of synthetic rubber processing wastewater

Nor Faekah Ismail, Fatihah Suja`

Research output: Contribution to journalArticle

Abstract

The aim of this study to investigate the performance of a partially packed up-flow anaerobic fixed film (UAFF) reactor at hydraulic retention times (HRT) of 17, 14, 10, 8 and 5 days. The reactor was fed with high strength synthetic wastewater that had a chemical oxygen demand (COD) concentration of 6550 ± 380 mg/L and organic loading rate (OLR) of 0.5, 0.6, 0.7, 0.8 and 1.3 g COD/l/day equivalent to HRT of 17, 14, 10, 8 and 5 days, respectively. The anaerobic degradation parameters such as the COD effluent concentration, COD removal percentage, volatile fatty acids (VFA), alkalinity, pH, biogas composition, biogas volume and ammonia effluent concentration were investigated. Results showed that the total COD removal efficiency of 97 ± 0.2, 96 ± 0.2, 92.5 ± 4.5, 91.5 ± 4.5 and 86 ± 6.5% at HRT of 17, 14, 10, 8 and 5 days respectively. The UAFF showed stable operation with effluent volatile fatty acid (VFA) less than 400 mg/L and alkalinity within the optimum range of 1000 – 2000 mg/L. The buffering capacity for all HRTs were below the maximum allowable limit of 0.5 with pH variation around 6 – 8 throughout the experimental period. Moreover, the average methane percentage showed a moderately constant profile with the highest methane production obtained was 48.2% at HRT of 5 days and was unaffected by reduced HRT and high ammonia concentration of 208 mg/L. These results show that methane forming bacteria were adapted to its surrounding which was contained high COD at reduced HRTs and did not significantly affect the reactor performance.

Original languageEnglish
Pages (from-to)43-49
Number of pages7
JournalInternational Journal of Recent Technology and Engineering
Volume8
Issue number1
Publication statusPublished - 1 May 2019

Fingerprint

Synthetic rubber
Chemical oxygen demand
Wastewater
Hydraulics
Processing
Volatile fatty acids
Effluents
Methane
Biogas
Alkalinity
Ammonia
Waste water
Rubber
Bacteria
Degradation
Chemical analysis
Effluent

Keywords

  • Anaerobic digestion
  • Fixed film
  • Hydraulic retention time
  • Methane production
  • Packed column

ASJC Scopus subject areas

  • Engineering(all)
  • Management of Technology and Innovation

Cite this

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title = "Effect of hydraulic retention times on the performance of a partially packed upflow anaerobic fixed film system in the treatment of synthetic rubber processing wastewater",
abstract = "The aim of this study to investigate the performance of a partially packed up-flow anaerobic fixed film (UAFF) reactor at hydraulic retention times (HRT) of 17, 14, 10, 8 and 5 days. The reactor was fed with high strength synthetic wastewater that had a chemical oxygen demand (COD) concentration of 6550 ± 380 mg/L and organic loading rate (OLR) of 0.5, 0.6, 0.7, 0.8 and 1.3 g COD/l/day equivalent to HRT of 17, 14, 10, 8 and 5 days, respectively. The anaerobic degradation parameters such as the COD effluent concentration, COD removal percentage, volatile fatty acids (VFA), alkalinity, pH, biogas composition, biogas volume and ammonia effluent concentration were investigated. Results showed that the total COD removal efficiency of 97 ± 0.2, 96 ± 0.2, 92.5 ± 4.5, 91.5 ± 4.5 and 86 ± 6.5{\%} at HRT of 17, 14, 10, 8 and 5 days respectively. The UAFF showed stable operation with effluent volatile fatty acid (VFA) less than 400 mg/L and alkalinity within the optimum range of 1000 – 2000 mg/L. The buffering capacity for all HRTs were below the maximum allowable limit of 0.5 with pH variation around 6 – 8 throughout the experimental period. Moreover, the average methane percentage showed a moderately constant profile with the highest methane production obtained was 48.2{\%} at HRT of 5 days and was unaffected by reduced HRT and high ammonia concentration of 208 mg/L. These results show that methane forming bacteria were adapted to its surrounding which was contained high COD at reduced HRTs and did not significantly affect the reactor performance.",
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