Energy cost assessment of a dairy industry wastewater treatment plant

Yapıcıoğlu, Pelin; Yeşilnacar, Mehmet İ̇rfan

doi:10.1007/s10661-020-08492-y

Cited by 21 publications

(11 citation statements)

References 35 publications

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“…Consequently, subsequent treatment of these dairy effluents is necessary for possible reuse to ensure sustainable dairy wastewater management. Reverse osmosis seems to be the most suitable technology due to its efficiency in generating process water [1,32] and it was demonstrated as an economically profitable alternative compared to other techniques used for treatment of wastewater in the dairy industry [11,33]. By using this membrane treatment, milk solids in WW can also be retained and reused, however, it will be necessary to make sure that these wastewaters are not contaminated with alkaline cleaning solutions.…”

Section: Differences In the Chemical Characteristics Of White And Cleaning Wastewatermentioning

confidence: 99%

Characterization of Chemical and Bacterial Compositions of Dairy Wastewaters

Alalam

Ben-Souilah

Lessard

et al. 2021

Dairy

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The dairy industry produces large amounts of wastewater, including white and cleaning wastewater originating principally from rinsing and cleaning-in-place procedures. Their valorization into process water and non-fat milk solids, in the case of white wastewater, or the renewal of cleaning solutions could be achieved using pressure-driven membrane processes. However, it is crucial to determine the intrinsic characteristics of wastewaters, such as proximate composition and bacterial composition, to optimize their potential for valorization. Consequently, white and cleaning wastewaters were sampled from industrial-scale pasteurizers located in two different Canadian dairy processing plants. Bacterial profiles of dairy wastewaters were compared to those of tap waters, pasteurized skim milk and unused cleaning solutions. The results showed that the physicochemical characteristics as well as non-fat milk solids contents differed drastically between the two dairy plants due to different processing conditions. A molecular approach combining quantitative real-time polymerase chain reaction (qPCR) and metabarcoding was used to characterize the bacteria present in these solutions. The cleaning solutions did not contain sufficient genomic DNA for sequencing. In white wastewater, the bacterial contamination differed depending on the dairy plant (6.91 and 7.21 log10 16S gene copies/mL). Psychrotrophic Psychrobacter genus (50%) dominated white wastewater from plant A, whereas thermophilic Anoxybacillus genus (56%) was predominant in plant B wastewater. The use of cold or warm temperatures during the pasteurizer rinsing step in each dairy plant might explain this difference. The detailed characterization of dairy wastewaters described in this study is important for the dairy sector to clearly identify the challenges in implementing strategies for wastewater valorization.

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Section: Differences In the Chemical Characteristics Of White And Cleaning Wastewatermentioning

confidence: 99%

Characterization of Chemical and Bacterial Compositions of Dairy Wastewaters

Alalam

Ben-Souilah

Lessard

et al. 2021

Dairy

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“…They reported that sodium thiosulphate induced immobilized protease secreting bacterial disintegration was a feasible process with net profit of 2.6 USD Ton -1 of sludge. Yapıcıoğlu and Yeşilnacar (2020) [25] used the similar assessment method to determine the energy costs of a dairy wastewater treatment plant in terms of wastewater treatment process. They found that energy cost indicator of the existing treatment process was lower than optimum operating conditions.…”

Section: Energy Cost Assessmentmentioning

confidence: 99%

Investigation of energy costs for sludge management: a case study from dairy industry

Yapıcıoğlu

Yeşilnacar

2021

Environmental Research and Technology

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Sludge management has been regarded as an environmental challenge to deal with due to high energy costs for wastewater treatment plants. From this perspective, energy costs of sludge management should be defined and calculated in order to obtain an effective energy management in wastewater treatment plants. Energy consumption of sludge management is the major constituent of the operational costs. Especially, dewatering processes have led to high electricity consumption at industrial wastewater treatment plants. This paper aimed to define the role of design and operational parameters on energy costs of sludge treatment process in terms of total organic carbon (TOC) and sludge volume index (SVI) considering water-energy nexus. Dissolved Air Flotation (DAF) sludge and centrifuge decanter were used for sludge dewatering process in a dairy wastewater treatment plant. Lime is used for sludge stabilization. Energy cost index has been figured out using a new derived numerical method. This study proposed a new developed methodology for energy cost assessment of sludge management. This paper revealed that energy costs would be lower if the wastewater treatment plant was operated under design conditions. If the plant was operated at design conditions, nearly 63% of reduction on energy costs of sludge handling process could be ensured. It has been recommended this plant could be operated under design conditions.

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“…Indirect GHG emissions are originated from water-energy nexus. The water-energy nexus evaluation tool is a kind of systematic approach that underlines the relationship between water and energy (Landa-Cansigno et al 2020;Yapıcıoğlu and Yeşilnacar 2020). It is clear that energy is a need for water treatment and distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, energy need of a plant majorly depends on operational parameters that are the volume of wastewater treated (flow rate) and organic load (biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS), fats, oil and grease (FOG), etc.) (Metcalf and Eddy 2014;Yapıcıoğlu and Yeşilnacar 2020). In order to reduce greenhouse gas emissions, energy consumption should be limited considering these parameters.…”

Section: Introductionmentioning

confidence: 99%

Minimizing greenhouse gas emissions of an industrial wastewater treatment plant in terms of water–energy nexus

Yapıcıoğlu

Demir

2021

Appl Water Sci

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In this paper, (CO2) and methane (CH4) emissions of an industrial wastewater treatment plant were monitored. GHG emissions originated from treatment processes were considered as the direct emissions and determined using closed chamber method. GHG emission due to energy consumption was regarded as the indirect emissions. In the second stage of the study, it was aimed to reduce GHG emissions in terms of water–energy nexus. If the plant is operated under design conditions, energy consumption would be lower according to water–energy nexus. Also, the effect of design conditions on GHG emissions was investigated. Firstly, the correlation was defined between GHG emissions and operational parameters in terms of chemical oxygen demand (COD) and wastewater flow rate using Monte Carlo simulation. Then, design COD and wastewater flow rate were simulated to determine the possible GHG emission for each month. The simulation results show that minimization of GHG emissions might be possible if wastewater plant is operated under design conditions. The minimum greenhouse gas emission in the result of the simulation study is 8.25 kg CO2-eq/d if the plant is operated under design COD and flow rate. Total reduction in GHG emissions is approximately 30% if the plant is operated under design conditions.

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Energy cost assessment of a dairy industry wastewater treatment plant

Cited by 21 publications

References 35 publications

Characterization of Chemical and Bacterial Compositions of Dairy Wastewaters

Characterization of Chemical and Bacterial Compositions of Dairy Wastewaters

Investigation of energy costs for sludge management: a case study from dairy industry

Minimizing greenhouse gas emissions of an industrial wastewater treatment plant in terms of water–energy nexus

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