scholarly journals Energy efficiency of food production wastewater anaerobic-aerobic treatment

2019 ◽  
Vol 140 ◽  
pp. 01001 ◽  
Author(s):  
Rustem Khabibullin ◽  
Thao Le Huong ◽  
Olga Ivanchenko ◽  
Andrey Petrov
Keyword(s):  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Food Production ◽  
Functional Dependence ◽  
Organic Load ◽  
Specific Yield ◽  
Process Conditions ◽  
Resource Saving ◽  
Specific Flow ◽  
Load Rate

The advanced energyand resource saving technologies of food production wastewater treatment include anaerobic and aerobic steps. At present, various methods of intensification and optimization are used to increase the efficiency of anaerobic processes of wastewater treatment, including selection of active microbial communities, providing the optimum temperature regime, immobilizing biomass by granulation or biofilm formation, reducing various inhibitory effects, phase separation or pre-acidification, chemical or biological pretreatment of wastewater. The aim of this investigation was researching the effect of hydraulic and organic load rates on the energy efficiency of the wastewater treatment process and evaluating the energy efficiency depending on process conditions. Experimental laboratory installation included subsequently connected bioreactors, one from which acted as first stage and other bioreactors as the second stages of anaerobic process. It was shown that the biogas formation at the first and second stages differs significantly. A small volume of released biogas on the first stage allows us to ignore it, but characteristics of biogas formation at the second stage bioreactors are close and are described by general functional dependence. The specific yield of biogas from the organic matter consumed Ybg is independent of the specific organic load rate L, but is dependent on the specific flow rate of the treated water D.

Effect of organic load and nutrient ratio on the operation stability of the moving bed bioreactor for kraft mill wastewater treatment and the incidence of polyhydroxyalkanoate biosynthesis

2012 ◽  
Vol 66 (2) ◽  
pp. 370-376 ◽  
Author(s):  
G. Pozo ◽  
C. A. Villamar ◽  
M. Martínez ◽  
G. Vidal
Keyword(s):  
Wastewater Treatment ◽  
N:P Ratio ◽  
Organic Load ◽  
Moving Bed ◽  
Nutrient Ratio ◽  
Load Rate ◽  
Operation Stability ◽  
Kraft Mill ◽  
Five Phases ◽  
Relationship Of

This paper studies the effect of organic load rate (OLR) and nutrient ratio on operation stability of the moving bed bioreactor (MBBR) for kraft mill wastewater treatment, analyzing the incidence of polyhydroxyalkanoate (PHA) production. The MBBR operating strategy was to increase OLR from 0.25 ± 0.05 to 2.41 ± 0.19 kg COD m−3 d−1 between phases I and IV. The BOD5:N:P ratio (100:5:1 and 100:1:0.2) was evaluated as an operation strategy for phases IV to V. A stable MBBR operation was found when the OLR was increased during 225 days in five phases. The maximum absolute fluorescence against the proportion of cells accumulating PHA was obtained for an OLR of 2.41 ± 0.19 kg COD m−3d−1 and a BOD5:N:P relationship of 100:1:0.2. The increase of PHA biosynthesis is due to the increased OLR and is not attributable to the increased cell concentration, which is maintained constant in stationary status during bioreactor biosynthesis.

scholarly journals Removal of nutrients and organic pollutants from domestic wastewater treatment by sponge-based moving bed biofilm reactor

2019 ◽  
Vol 25 (5) ◽  
pp. 652-658
Author(s):  
Huynh Tan Nhut ◽  
Nguyen Tri Quang Hung ◽  
Tran Cong Sac ◽  
Nguyen Huynh Khanh Bang ◽  
Tran Quang Tri ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Plan ◽  
Domestic Wastewater ◽  
Biofilm Reactor ◽  
Organic Load ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Domestic Wastewater Treatment ◽  
Load Rate ◽  
Organic Load Rate

This study evaluates the efficiency of domestic wastewater treatment via Sponge-Based Moving Bed Biofilm Reactor (S-MBBR). The laboratory-based treatment plan uses polyurethane sponge with a specific surface area was 260 m<sup>2</sup>/m<sup>3</sup> as a carrier. The treatment plan operated under four different organic load rate: OLR1 = 0.4 kg BOD/m<sup>3</sup>.day; OLR2 = 0.6 kg BOD/m<sup>3</sup>.day; OLR3 = 0.8 kg BOD/m<sup>3</sup>.day; and OLR4 = 1.0 kg BOD/m<sup>3</sup>.day. During 80 d of the experiment, the highest treatment efficiency was at the organic load rate of 0.4 kg BOD/m<sup>3</sup>.day, with COD, SS, TN and TP were found to be 85.0 ± 12.9%, 85.7 ± 5.3%, 68.9 ± 1.7%, and 40.3 ± 0.2%, respectively. In which, the influent SS concentration were from 117.3 to 126.0 mg/L, the effluent concentration were in ranged 18.0 to 34.22 mg/L, respectively. The values of influent and effluent COD were 298.8 ± 12.88 and 44.8 ± 3.78 mg/L in turn. The OLR1 influent TN, TP concentrations were respectively 47.9 ± 2.11 and 3.6 ± 0.15 mg/L; the effluent TN, TP concentration were 14.9 ± 0.18 and 2.2 ± 0.06 mg/L, respectively. The study suggests that the effluent is within the allowable limits of National technical regulation on domestic wastewater (Column B1), indicating the applicability of S-MBBR for the domestic wastewater treatment plant.

scholarly journals Impact of Operational Parameters on Bacterial Community in a Full-Scale Municipal Wastewater Treatment Plant

2012 ◽  
Vol 61 (1) ◽  
pp. 41-49 ◽  
Author(s):  
AGNIESZKA CYDZIK-KWIATKOWSKA ◽  
MAGDALENA ZIELIŃSKA ◽  
IRENA WOJNOWSKA-BARYŁA
Keyword(s):  
Wastewater Treatment ◽  
Bacterial Community ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Organic Load ◽  
Municipal Wastewater Treatment ◽  
Load Rate ◽  
Organic Load Rate ◽  
Ammonia Oxidising Bacteria

A bacterial community in activated sludge from a full-scale municipal wastewater treatment plant was monitored throughout the year with the use of FISH, RISA and DGGE techniques. In the investigated range of temperatures (11.9-21.6 degrees C), a rise in temperature resulted in a lower total bacteria richness, while organic load rate changes from 0.09 to 0.21 g COD x g TSS(-1) x d(-1) were positively correlated with the number of bands in RISA patterns. The most diverse pattern (29 different bands) was characteristic for the activated sludge sample collected at the end of January at wastewater temperature of 11.9 degrees C. The ammonia-oxidising bacteria community did not change during the study, and comprised of 4 different bacterial populations with one dominant species closely related to Nitrosospira sp. REGAU (GenBank accession number AY635572.1). The percentage of ammonia-oxidising bacteria in the activated sludge varied from 6.2 to 19.5% and depended on temperature (R = 0.61, p = 0:02) and organic load rate (R = -0.55, p = 0.04).

scholarly journals Energy Cost Assessment of an Industrial Wastewater Treatment Plant: Effect of Design Flow

2019 ◽  
Vol 2 (3) ◽  
pp. 532-537 ◽  
Author(s):  
Pelin Yapicioğlu
Keyword(s):  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Energy Cost ◽  
Energy Demand ◽  
Treatment Plant ◽  
Design Flow ◽  
Dairy Wastewater ◽  
Organic Load ◽  
Design Parameters

Wastewater treatment plants are widely used to decrease harmful discharges to receiving water bodies. These plants are regarded as the top energy consumers by municipalities. Energy demand of a plant depends on the volume of wastewater treated, organic load and effluent quality requirement etc. In order to ensure energy efficiency in these plants, it should be focused on these parameters. In this study, the impacts of design parameters on energy cost for a dairy wastewater treatment plant were investigated. This paper aims to reveal the role of design flow on energy efficiency. An indicator parameter that is energy cost indicator has been used. This indicator was calculated for both design wastewater flow and operational wastewater flow. The results show that energy cost indicator of operational flow was higher than design flow that were 2.1x10-8 and 2.36x10-27, respectively. If plants are operated in design flows, energy cost can be decreased.

scholarly journals An analysis of performance of an anaerobic fixed film biofilter (AnF2B) reactor in treatment of cassava wastewater

2021 ◽  
Vol 1 (10 (109)) ◽  
pp. 6-13
Author(s):  
Prayitno Prayitno ◽  
Sri Rulianah ◽  
Windi Zamrudy ◽  
Sugeng Hadi Susilo
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Biogas Production ◽  
Cassava Starch ◽  
Cod Removal ◽  
Organic Load ◽  
Reactor Performance ◽  
Hydraulic Residence Time ◽  
Load Rate ◽  
Starch Wastewater

The cassava starch wastewater contains organic materials (as BOD, COD) in high concentrations so it has the potential to cause pollution in the aquatic environment. Several methods of cassava starch wastewater treatment have been used to reduce the concentration of organic matter (pollutants) in cassava starch wastewater, including Activated Sludge, Stabilization Pond, Anaerobic-Aerobic filter process. However, various studies continue to be carried out to get higher processing efficiency on the factors that influence it. Several factors influence the efficiency of wastewater treatment processes, including the type and origin of decomposing microorganisms, hydraulic residence time (HRT), organic load rate (OLR), process design, pH, and temperature. The research aimed to evaluate the performance of the AnF2B reactor in treating cassava starch wastewater, in which the reactor performance is shown by changes in organic matter removal (COD removal) and biogas production. The research is conducted using 3 types of AnF2B reactors wherein each AnF2B reactor contains a bee nest-shaped bio-filter as a growth medium for the consortium of indigenous bacteria. The AnF2B reactor operates in anaerobic conditions with a set temperature of 29–30 °C and a pH of 4.5–7. In each AnF2B reactor, cassava starch wastewater is fed with different OLR so that each reactor has an HRT of 5, 6, and 7 days. The concentration of COD at the influent and effluent of the reactor was measured and the biogas was produced using the APHA standard method. The results showed that the AnF2B reactor had a satisfactory performance in COD removal and biogas production, which at HRT: 6 days and OLR of 1.72 g/L·day found that the maximum COD removal was 98 % and the volume of biogas of 4.8 L/L·day was produced on the 12th day

scholarly journals Energy Cost Estimation for a Dairy Wastewater Treatment Plant in Terms of Organic Load

2019 ◽  
Vol 2 (3) ◽  
pp. 859-864
Author(s):  
Pelin Yapicioğlu
Keyword(s):  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Cost Estimation ◽  
Energy Cost ◽  
Energy Demand ◽  
Treatment Plant ◽  
Dairy Wastewater ◽  
Organic Load ◽  
The Impact

Energy demand of a wastewater treatment plant is mainly based on the volume of wastewater treated and organic load. In order to obtain energy efficiency in wastewater treatment plants, these significant parameters should be considered. Dairy wastewater has a high organic content. In this study, the impact of design organic loading parameter on energy cost for a dairy wastewater treatment plant was investigated. The aim of the study is in order to reveal the role of design biological oxygen demand on energy efficiency. A new development model that is energy cost indicator has been used. This index was figured out for both design organic load and operational organic load. The results revealed that energy cost indicator of operational organic load was higher than design organic load that were 2.1 x10-8 and 7.2x10-18, respectively. If WWTPs are operated at design organic load, energy cost would be lower.

Fiber energy efficiency Part I: Extended entropy model

2014 ◽  
Vol 29 (2) ◽  
pp. 322-331 ◽  
Author(s):  
Anders Karlström ◽  
Karin Eriksson
Keyword(s):  
Energy Efficiency ◽  
Temperature Profile ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Multiscale Model ◽  
Process Conditions ◽  
Entropy Model ◽  
Refining Zone ◽  
Energy Balances ◽  
Flat Zone

Abstract This is the first in a series of papers presenting the development of a comprehensive multiscale model with focus on fiber energy efficiency in thermo mechanical pulp processes. The fiber energy efficiency is related to the defibration and fibrillation work obtained when fibers and fiber bundles interact with the refining bars. The fiber energy efficiency differs from the total refining energy efficiency which includes the thermodynamical work as well. Extracting defibration and fibrillation work along the radius in the refining zone gives information valuable for fiber development studies.Models for this process must handle physical variables as well as machine specific parameters at different scales. To span the material and energy balances, spatial measurements from the refining zone must be available. In this paper, measurements of temperature profile and plate gaps from a full-scale CD-refiner are considered as model inputs together with a number of process variables. This enables the distributed consistency in the refining zone as well as the split of the total work between the flat zone and the CD-zone to be derived. As the temperature profile and the plate gap are available in the flat zone and the CD-zone at different process conditions it is also shown that the distributed pulp dynamic viscosity can be obtained. This is normally unknown in refining processes but certainly useful for all fluid dynamic models describing the bar-to-fiber interactions. Finally, it is shown that the inclusion of the machine parameters will be vital to get good estimates of the refining conditions and especially the split between the thermodynamical work and the defibration/fibrillation work.

Изучение отклика дегидрогеназной активности ила на изменение технологических параметров работы аэротенка

2020 ◽  
Author(s):  
N. Zaletova ◽  
S. Zaletov
Keyword(s):  
Wastewater Treatment ◽  
Dehydrogenase Activity ◽  
Biological Treatment ◽  
Biological Process ◽  
Organic Load ◽  
Treatment Processes ◽  
Mode Of Operation ◽  
Concentrated Solution ◽  
Available Information ◽  
Complicated Mechanism

Биологический метод очистки сточных вод представляет собой сложный многокомпонентный процесс, ключевой составляющей которого является работа ферментной системы. Известно, что одним из важнейших ферментов, обеспечивающих биологический процесс, являются дегидрогеназы. Полностью сложнейший механизм действия ферментов до конца пока не раскрыт, однако в практике контроля процессов биологической очистки используется показатель дегидрогеназной активности ила. Результаты исследований позволили дополнить имеющуюся информацию фактическими данными о взаимообусловленности уровня дегидрогеназной активности ила и показателей отдельных технологических параметров биологической очистки. Показано, что режим работы аэротенков (нагрузка на ил, доза активного ила и др.) и величина показателей исходной дегидрогеназной активности и дегидрогеназной активности этого же образца ила со слабо концентрированным раствором (ДАИН2О) связаны между собой и зависят от нагрузки на ил по органическим веществам. Полученные результаты исследования могут быть использованы для контроля биологического процесса очистки сточных вод.The biological method of wastewater treatment is a comprehensive multicomponent process the activities of the enzyme system being the key component of it. It is known that dehydrogenases have been one of the most important enzymes the ensure the biological process. The complicated mechanism of the action of enzymes has not been fully described so far however, in the practice of monitoring biological treatment processes, an indicator of the dehydrogenase activity of sludge is used. The research results provided for supplementing the available information with actual data on the interdependence of the level of dehydrogenase activity of sludge and indicators of individual process parameters of biological treatment. It was shown that the mode of operation of aeration tanks (organic matter load on sludge, dose of activated sludge, etc.) and the values of the initial dehydrogenase activity and dehydrogenase activity of the same sludge sample with weakly concentrated solution (DASН2О) are interconnected and depend on the organic load on sludge. The results of the study can be used to control the biological process of wastewater treatment.The biological method of wastewater treatment is a comprehensive multicomponent process the activities of the enzyme system being the key component of it. It is known that dehydrogenases have been one of the most important enzymes the ensure the biological process. The complicated mechanism of the action of enzymes has not been fully described so far however, in the practice of monitoring biological treatment processes, an indicator of the dehydrogenase activity of sludge is used. The research results provided for supplementing the available information with actual data on the interdependence of the level of dehydrogenase activity of sludge and indicators of individual process parameters of biological treatment. It was shown that the mode of operation of aeration tanks (organic matter load on sludge, dose of activated sludge, etc.) and the values of the initial dehydrogenase activity and dehydrogenase activity of the same sludge sample with weakly concentrated solution (DASН2О) are interconnected and depend on the organic load on sludge. The results of the study can be used to control the biological process of wastewater treatment.

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