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Process Evaluation for Petroleum Wastewater Co-digestion with Rye Grass to Enhance Methane Production

  • Anwar Ahmad
Original Paper
  • 17 Downloads

Abstract

In this study a green waste rye grass was added as the co-substrate for petroleum wastewater (PWW) fermentation with different mixing ratios for enhancing methane production. First order modified process model was employed to methane production from co-digestion of PWW with different ratio of rye grass. The results showed that the highest methane yield was 204.8 mL/g-VSadded/h− 1 and total solids 41.6% and volatile solids (VS) 29.6% removal ratio reached at the ratio of 30–70 PWW-rye grass. Which were 98.7, 61.9 and 34.5 times higher than that from sole PWW fermentation, respectively. The first order modified process model best fitted the actual evolution of methane yields, as evidenced by low root mean square prediction error as well as high correlation difference between the predicted and actual values. The utilization of carbohydrate and protein were also improved by co-digestion of PWW with rye grass. After methane fermentation, acetate was the dominant soluble metabolites in all groups. The SMA activity results showed that more active microorganisms in the co-digestion system contributed to higher methane production and waste utilization.

Keywords

Process analysis Co-digestion Rye grass biomass Petroleum wastewater Methane yield 

Abbreviations

PWW

Petroleum wastewater

UASBR

Upflow anaerobic sludge blanket reactor

VS

Volatile solids

COD

Chemical oxygen demand (g/l)

Alk

Alkalinity

BOD

Biochemical oxygen demand (mg/l)

D

Dilution rate, 1/HRT (day_1)

PWW

Petroleum waste water

l

Liter

NH3-N

Ammonia nitrogen (mg/l)

O&G

Oil and grease (mg/l)

OLR

Organic loading rate (kg/m3/day)

S

Substrate concentration in the reactor (mg/l)

S1

Influent substrate concentration (mg/l)

S2

Effluent substrate concentration (mg/l)

SCOD

Soluble chemical oxygen demand (mg/l)

SRT

Solid retention time (days)

SS

Suspended solid (mg/l)

t

Time (days)

MLSS

Mixed liqor suspended sludge (mg/l)

SVI

Sludge volume index (ml/l)

TN

Total nitrogen (mg/l)

TS

Total solid (mg/l)

TVS

Total volatile solid (mg/l)

UASFF

Up-flow anaerobic sludge fixed film

V

Volume reactor (l)

VFA

Volatile fatty acid (mg/l)

TC

Total carbon

VSS

Volatile suspended solid (mg/l)

SSV

Sludge settling velocity (m/h)

SMA

Specific methanogenic activity

Y

Measured methane yield (l/gCODadded) Fd (ml gCOD l POMEadded)

Diff. %

Difference between

fd

Methane potential

Rm

Methane production rate (ml/gCOD/h)

Khyd.

Hydrolysis rate (g COD/day)

n

Shape factor

λ

Lag phase time (h)

S.E.E

Standard error of estimate

RMSE

Root mean square prediction error

Notes

Acknowledgements

The authors thank the deanship of scientific research (DSR) at University of Nizwa (UNIZWA) for its funding of this research through the cluster research group.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Civil and Environmental Engineering Department, College of Engineering and ArchitectureUniversity of NizwaNizwaSultanate of Oman

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