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Study of the Operation of a Continuous Modular Bioreactor Used for Treatment of Wastewater from a Recycling Industry of by-Products from Slaughterhouses

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Abstract

The objective of this paper was to present the operational performance of a bioreactor’s technology for treating wastewater from a recycling industry of by-products from slaughterhouses. In addition, it contributes to overcome the main disadvantages of treatment using Australian pond systems. The modular bioreactor described in this work consists of an alternative and innovative equipment that operates continuously on an industrial scale, which enables the treatment of liquid waste. The modular bioreactor was constructed of reinforced concrete with dimensions 70 m in length, 1.2 m in width, and 0.6 m in height, with an internal volume of 35,000 L, the process of wastewater degradation alternating between aerobic and anoxic conditions, being predominantly anoxic. The bioreactor was tested in two stages, by using this industrial wastewater. In the first stage, totaling 243 days, a primary effluent was added, consisting of high concentration of pollutants; and in a second stage, totaling 288 days, it was added a biologically pretreated effluent (after an anaerobic post-digestion process). The input-output parameters pH, turbidity, conductivity, temperature, and dissolved oxygen were monitored weekly, while total phosphorus, orthophosphate, total nitrogen, ammonium, nitrite, nitrate, total suspended solids, sedimented solids, oils and greases, COD, BOD, and alkalinity parameters were determined monthly. The bioreactor was promising in terms of pollutant removal efficiency, and partial nitrification may have occurred on a continuous scale in the first stage of the tests.

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Abbreviations

BOD:

biochemical oxygen demand

COD:

chemical oxygen demand

EPR:

effluent percolation rate

FMS:

fast mixing speed

OD:

dissolved oxygen

RMT:

rapid mixing time

SMS:

slow mixing speed

SMT:

slow mixing time

SS:

sedimented solids

TBD:

turbidity

TDM:

toxicity Daphnia magna

TF:

toxicity factor

THRT:

theoretical hydraulic retention time

TS:

total solids

TVF:

toxicity vibrio fischeri

WAPT:

wastewater after primary treatment

WAAD:

wastewater after anaerobic digestion

UASB:

upflow anaerobic sludge blanket

CODsection1:

COD parameter of section 1

CODsection11:

COD parameter of section 11

FR:

flow of the bioreactor

Psection1:

parameter in section 1

Psection11:

parameter in section 11

RR.COD:

COD removal rate

VB:

volume of the bioreactor

%Rem:

percentage of removal of the parameter

SD:

standard deviation

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Acknowledgements

The authors would like to thank the industry FARICON AGRÍCOLA LTDA which contributed to the research.

To CAPES for access to the SCOPUS database.

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  1. Chemical Engineering Department, State University of West of Paraná–Unioeste, Rua da Faculdade, 645, Toledo, PR, 85903000, Brazil

    Alcides Tonhato Junior, Camilo Freddy Mendoza Morejon & Salah Din Mahmud Hasan

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  1. Alcides Tonhato Junior
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Tonhato Junior, A., Morejon, C.F.M. & Hasan, S.D.M. Study of the Operation of a Continuous Modular Bioreactor Used for Treatment of Wastewater from a Recycling Industry of by-Products from Slaughterhouses. Water Air Soil Pollut 230, 82 (2019). https://doi.org/10.1007/s11270-019-4133-x

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