scholarly journals Implementing Cost-effective Co-treatment of Domestic and Food-industrial Wastewater by Novel Methods for Estimating Industrial Load

2020 ◽  
Vol 64 (4) ◽  
pp. 505-513
Author(s):  
Vince Bakos ◽  
Péter Szombathy ◽  
József Simon ◽  
Andrea Jobbágy
Keyword(s):  
Carbon Source ◽  
Wastewater Treatment Plants ◽  
Screening Method ◽  
Domestic Wastewater ◽  
Cost Effective ◽  
Flexible System ◽  
Additional Constant ◽  
Bioreactor System ◽  
Biological Nitrogen ◽  
Low Do

Detection and characterization of hidden industrial inflows causing high fluctuations of the inlet load, is a challenging issue pushing plant operators for a cost-effective solution at regional wastewater treatment plants (WWTPs). On the other hand, carbon source of food industrial origin may have a good use at WWTPs facing otherwise inlet carbon source deficiency.In a case study of a regional domestic WWTP receiving seasonally organic carbon-rich discharge from a fruit juice factory, a new method combining on-site measurements and mathematical modelling was developed and successfully applied for estimating the quality and quantity of both industrial influent load and incoming domestic wastewater streams properly. The originally un-staged bioreactor system operated at low dissolved oxygen (low DO) concentration was unable to meet effluent nitrogen requirements with an additional constant risk of encouraging filament growth. A novel screening method based on special sampling campaigns for estimating carbon availability and C:N ratios of influent wastewater streams coming separately from the large catchment area, was developed and applied. Staging of the previously low DO basins into a flexible system containing non-aerated selectors proved to be efficient for enhancing both biological nitrogen removal and sculpturing appropriately settling biomass.

Conditions and technologies of biological wastewater treatment in Hungary

2012 ◽  
Vol 65 (9) ◽  
pp. 1676-1683 ◽  
Author(s):  
G. M. Tardy ◽  
V. Bakos ◽  
A. Jobbágy
Keyword(s):  
Wastewater Treatment ◽  
Carbon Source ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plants ◽  
Treatment Temperature ◽  
Low Carbon ◽  
Biological Phosphorus Removal ◽  
Wastewater Quality ◽  
Removal Technologies ◽  
Biological Nitrogen

A survey has been carried out involving 55 Hungarian wastewater treatment plants in order to evaluate the wastewater quality, the applied technologies and the resultant problems. Characteristically the treatment temperature is very wide-ranging from less than 10 °C to higher than 26 °C. Influent quality proved to be very variable regarding both the organic matter (typical COD concentration range 600–1,200 mg l−1) and the nitrogen content (typical NH4-N concentration range 40–80 mg l−1). As a consequence, significant differences have been found in the carbon availability for denitrification from site to site. Forty two percent of the influents proved to lack an appropriate carbon source. As a consequence of carbon deficiency as well as technologies designed and/or operated with non-efficient denitrification, rising sludge in the secondary clarifiers typically occurs especially in summer. In case studies, application of intermittent aeration, low DO reactors, biofilters and anammox processes have been evaluated, as different biological nitrogen removal technologies. With low carbon source availability, favoring denitrification over enhanced biological phosphorus removal has led to an improved nitrogen removal.

Using excess sludge as carbon source for enhanced nitrogen removal and sludge reduction with hydrolysis technology

2010 ◽  
Vol 62 (7) ◽  
pp. 1536-1543 ◽  
Author(s):  
Yong-Qing Gao ◽  
Yong-Zhen Peng ◽  
Jing-Yu Zhang ◽  
Jian-Long Wang ◽  
Liu Ye
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plants ◽  
Reduction Rate ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Batch Reactors ◽  
Sludge Reduction ◽  
Zero Order Kinetics ◽  
Soluble Chemical Oxygen Demand

In order to improve the nitrogen removal efficiency and to achieve the sludge reduction in traditional wastewater treatment plants, a combined hydrolysis-anoxic-oxic (H-A-O) pilot-scaled reactor was used in this study to investigate the possibility and validity of using excess activated sludge (EAS) fermentation liquids to enhance the nitrogen removal. The results clearly showed that sludge acidification rate in fermentation reactor can reach to 43.2%. The percentages of acetic acid, propionic acid and butyric acid in the fermentation liquids were 68.4, 25.3 and 6.3%, respectively, while those in domestic wastewater were 73.0, 12.2 and 13.8%, respectively. Bioavailability of soluble chemical oxygen demand (SCOD) from fermentation liquids and domestic wastewater were investigated in batch reactors with nitrate as the electron accepter as well. The corresponding specific denitrification rates were 0.15 g NO3−-N/g VSS d−1 and 0.09 g NO3−-N/g VSS d−1. When the substances were enough, the denitrification reaction appeared to follow the zero-order kinetics. The results also showed that, when the H-A-O pilot-scaled reactor was operated continuously and sludge fermentation liquids were applied as additional carbon source in the A-O reactor, the removal efficiencies of SCOD, NH4+-N and total nitrogen (TN) were higher than 90, 95 and 79%, respectively. EAS reduction rate in this system was able to reach 40.4%, and the sludge VSS/SS ratio decreased from 0.82 to 0.59 after hydrolysis step.

Occurrence and enrichment of ‘bacterial sherpas’: climb to sustainability in wastewater treatment

2015 ◽  
Vol 72 (9) ◽  
pp. 1481-1487
Author(s):  
M. Arnaldos ◽  
K. R. Pagilla
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Initial Response ◽  
Biological Processes ◽  
Sufficient Time ◽  
Treatment Stage ◽  
Removal Processes ◽  
Biological Nitrogen ◽  
Insight Into ◽  
Low Do

The paper presents research on hemoglobin (Hb)-expressing bacteria in biological wastewater treatment systems. The outcome(s) will greatly reduce the aeration needs of wastewater treatment plants (WWTPs) and provide insight into emerging biological nitrogen removal processes using low dissolved oxygen (DO) conditions. In anthropogenic terms, the bacteria that express Hb could be considered as ‘bacterial sherpas’ that can function under low DO conditions. Hitherto, this functionality of bacteria has not been realized due to the initial response of the aerobic treatment stage: namely, morphology change by bacteria to filamentous forms to overcome oxygen mass transfer limitations causing bulking/foaming and nitrification inhibition. There is evidence, however, of the potential expression of Hb proteins by activated sludge (AS) bacteria. First, bacteria known to possess genes coding Hb proteins have been isolated from AS systems. Secondly, there is evidence that WWTPs are able to operate their biological processes at low DO without sludge bulking or incomplete nitrification. Our research has focused on nitrifying systems and has shown that this is due to prolonged operation at low DO conditions (0.1 mg O2/L), which allows sufficient time for bacterial acclimation. Additionally, it has been shown that enhanced Hb expression is linked to acclimation to low DO conditions.

scholarly journals Co-treatment of a Carbon Deficient Domestic Wastewater with a Dairy Process Effluent for a Cost-effective Global Solution

2018 ◽  
Vol 62 (4) ◽  
Author(s):  
Tamás Weinpel ◽  
Vince Bakos ◽  
Andrea Jobbágy
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
C:N Ratio ◽  
Winter Season ◽  
Optimal Solution ◽  
Domestic Wastewater ◽  
Cost Effective ◽  
Dairy Wastewater ◽  
Dairy Effluent ◽  
P Removal

In order to avoid possible toxic and harmful effects on domestic wastewater treatment plants (WWTPs) as well as to meet influent criteria for the sewer network, industrial facilities are generally obliged to pre-treat their process effluents before discharging. Although industrial inflows may indeed cause operational nuisances (particularly in case of hidden shock-loads and toxic agents), possible effects are highly depending on the origin and quality of the effluent discharged. On the other hand, however, readily biodegradable carbon shortage of domestic wastewater has been commonly becoming the bottleneck of cost-effective biological nutrient (N and P) removal worldwide. The paper draws attention to the promising novel approach of combined wastewater treatment which may offer an optimal solution by shifting the inlet C:N ratio into a favorable range for efficient denitrification and biological excess P-removal. At the start of the study the temporarily decreased treatment efficiency of the domestic WWTP investigated had been basically attributed to the dairy wastewater discharged from an ice cream factory of the catchment area. However, both on-site profile measurements and mathematical simulations suggested that instead of a direct harming effect, aeration was insufficient, and dissolved oxygen concentration had to be increased in the aerobic reactors for efficient nitrification, especially in winter season. The studies also confirmed that with adequate aeration, efficiency of denitrification would have considerably decreased without using the dairy effluent as complementary carbon source or expensive external C-source would have been required. However, in order to save unnecessary aeration costs, overdosing of dairy effluent has to be carefully avoided.

Feasibility and Characteristics of Denitrification Using Excess Sludge as the Sole Carbon Source

2012 ◽  
Vol 487 ◽  
pp. 69-73
Author(s):  
Liang Chang Zhang ◽  
Yong Zhen Peng ◽  
Yong Bo Li ◽  
Shu Ying Wang ◽  
Yong Zhi Chen
Keyword(s):  
Carbon Source ◽  
Volatile Fatty Acids ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Nitrate Removal ◽  
Biological Nitrogen Removal ◽  
Nutrients Removal ◽  
Excess Sludge ◽  
Biological Nitrogen ◽  
Biological Nutrients Removal

Adequate carbon source is critical for biological nutrients removal from wastewater, and waste activated sludge (WAS) treatment or disposal is costly and difficult in wastewater treatment plants. In this study, a novel sludge fermentation process was launched to develop the internal carbon source of WAS to enhance biological nitrogen removal, nitrite and nitrate was directly added into anaerobic fermentation system and then formed WAS anoxic fermentation denitrification system (AFD), in which, the sludge fermentation and denitrification were expected to proceed simultaneously. Experimental results of 40 days’ fermentation showed that 0.12 gNO2--N/gVSS and 0.11 gNO3--N/gVSS, or 0.26 gNO2--N/gVSS-reduction and 0.24 gNO3--N/gVSS-reduction, could be simultaneously obtained in AFD, and it could be calculated that 37.9% of total VSS and 80.7% of VSS reduction was utilized for nitrite or nitrate removal, which suggested a good performance of denitrification driven by WAS in AFD. The highest accumulation amount, 204 mg/L, of volatile fatty acids was occurred in the 11th day, which proved a rapid fermentation was present in AFD. Furthermore, the variations of pH or ORP in AFD could well indicate the progress of fermentation and denitrification.

Upgrading Wastewater Treatment Plants for Biological Nutrient Removal

1990 ◽  
Vol 22 (7-8) ◽  
pp. 53-60 ◽  
Author(s):  
B. Rabinowitz ◽  
T. D. Vassos ◽  
R. N. Dawson ◽  
W. K. Oldham
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Design Flow ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Conventional Activated Sludge ◽  
Recent Developments ◽  
Removal Technology ◽  
Biological Nitrogen

A brief review of recent developments in biological nitrogen and phosphorus removal technology is presented. Guidelines are outlined of how current understanding of these two removal mechanisms can be applied in the upgrading of existing wastewater treatment plants for biological nutrient removal. A case history dealing with the upgrading of the conventional activated sludge process located at Penticton, British Columbia, to a biological nutrient removal facility with a design flow of 18,200 m3/day (4.0 IMGD) is presented as a design example. Process components requiring major modification were the headworks, bioreactors and sludge handling facilities.

Bottlenecks in the Implementation of On-Site Wastewater Treatment Plants on a Large Scale in The Netherlands

1990 ◽  
Vol 22 (3-4) ◽  
pp. 291-298
Author(s):  
Frits A. Fastenau ◽  
Jaap H. J. M. van der Graaf ◽  
Gerard Martijnse
Keyword(s):  
Wastewater Treatment ◽  
The Netherlands ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Housing Stock ◽  
Research Work ◽  
Field Research ◽  
Domestic Wastewater ◽  
Research Programme ◽  
Definition Of

More than 95 % of the total housing stock in the Netherlands is connected to central sewerage systems and in most cases the wastewater is treated biologically. As connection to central sewerage systems has reached its economic limits, interest in on-site treatment of the domestic wastewater of the remaining premises is increasing. A large scale research programme into on-site wastewater treatment up to population equivalents of 200 persons has therefore been initiated by the Dutch Ministry of Housing, Physical Planning and Environment. Intensive field-research work did establish that the technological features of most on-site biological treatment systems were satisfactory. A large scale implementation of these systems is however obstructed in different extents by problems of an organisational, financial and/or juridical nature and management difficulties. At present research is carried out to identify these bottlenecks and to analyse possible solutions. Some preliminary results are given which involve the following ‘bottlenecks':-legislation: absence of co-ordination and absence of a definition of ‘surface water';-absence of subsidies;-ownership: divisions in task-setting of Municipalities and Waterboards; divisions involved with cost-sharing;-inspection; operational control and maintenance; organisation of management;-discharge permits;-pollution levy;-sludge disposal. Final decisions and practical elaboration of policies towards on-site treatment will have to be formulated in a broad discussion with all the authorities and interest groups involved.

Cost-effective upgrading of the Arnsberg WWTP by post denitrification with a moving bed system

2000 ◽  
Vol 41 (9) ◽  
pp. 123-130
Author(s):  
N. Jardin ◽  
L. Rath ◽  
A. Sabin ◽  
F. Schmitt ◽  
D. Thöle ◽  
...  
Keyword(s):  
Carbon Source ◽  
Biological Process ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Cost Effective ◽  
Benefit Analysis ◽  
Moving Bed ◽  
Trickling Filters ◽  
Sludge Hydrolysis ◽  
Effective Integration

On the basis of a cost-benefit analysis it was decided to expand the Arnsberg WWTP by a multistage biological process which allows for cost-effective integration of the existing facilities. Carbon removal will then be accomplished in a high-loaded activated sludge stage for which the existing primary clarifier is to be reconstructed. The existing trickling filters will be used for nitrification during a midterm period and will be replaced later on either by a moving bed system or by new trickling filters. Line 3 of the existing secondary clarifiers will be reconstructed and used for post denitrification in a moving bed system. The carbon needed for denitrification will be provided by means of sludge hydrolysis and the use of an external carbon source.

scholarly journals Effects of Urban Forms on Separate Drainage Systems: A Virtual City Perspective

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 758 ◽  
Author(s):  
Jia ◽  
Sitzenfrei ◽  
Rauch ◽  
Liang ◽  
Liu
Keyword(s):  
Urban Form ◽  
Domestic Wastewater ◽  
Cost Effective ◽  
Three Dimensions ◽  
Rapid Urbanization ◽  
Drainage Systems ◽  
Urban Forms ◽  
Storm Water Management Model ◽  
Wastewater Systems ◽  
Performance Dimensions

The development of urban drainage systems is challenged by rapid urbanization; however, little attention is paid to the urban form and its effects on these systems. This study develops an integrated city-drainage model that configures typical urban forms and their associated drainage infrastructures, specifically domestic wastewater and rainwater systems, to analyze the relationship between them. Three typical types of urban forms were investigated: the square, the star, and the strip. Virtual cities were designed first, with the corresponding drainage systems generated automatically and then linked to a model herein called the Storm Water Management Model (SWMM). Evaluation was based on 200 random configurations of wastewater/rainwater systems with different structures or attributes. The results show that urban forms play more important roles on three dimensions of performance, namely economic efficiency, effectiveness, and adaptability, of the rainwater systems than of the wastewater systems. Cost is positively correlated to the effectiveness of rainwater systems among the different urban forms, while adaptability is negatively correlated to the other two performance dimensions. Regardless of the form, it is difficult for a city to make its drainage systems simultaneously cost-effective, efficient, and adaptable based on the virtual cities we investigated. This study could inspire the urban planning of both built-up and to-be-built areas to become more sustainable with their drainage infrastructure by recognizing the pros and cons of different macroscale urban forms.

scholarly journals Genetic Analysis of a Cohort of 275 Patients with Hyper-IgE Syndromes and/or Chronic Mucocutaneous Candidiasis

2021 ◽  
Author(s):  
Natalie Frede ◽  
Jessica Rojas-Restrepo ◽  
Andrés Caballero Garcia de Oteyza ◽  
Mary Buchta ◽  
Katrin Hübscher ◽  
...  
Keyword(s):  
Screening Method ◽  
Cost Effective ◽  
Illumina Miseq ◽  
Clinical Findings ◽  
Genetic Defects ◽  
Chronic Mucocutaneous Candidiasis ◽  
Mucocutaneous Candidiasis ◽  
Serious Infections ◽  
History Of ◽  
Panel Sequencing

AbstractHyper-IgE syndromes and chronic mucocutaneous candidiasis constitute rare primary immunodeficiency syndromes with an overlapping clinical phenotype. In recent years, a growing number of underlying genetic defects have been identified. To characterize the underlying genetic defects in a large international cohort of 275 patients, of whom 211 had been clinically diagnosed with hyper-IgE syndrome and 64 with chronic mucocutaneous candidiasis, targeted panel sequencing was performed, relying on Agilent HaloPlex and Illumina MiSeq technologies. The targeted panel sequencing approach allowed us to identify 87 (32 novel and 55 previously described) mutations in 78 patients, which generated a diagnostic success rate of 28.4%. Specifically, mutations in DOCK8 (26 patients), STAT3 (21), STAT1 (15), CARD9 (6), AIRE (3), IL17RA (2), SPINK5 (3), ZNF341 (2), CARMIL2/RLTPR (1), IL12RB1 (1), and WAS (1) have been detected. The most common clinical findings in this cohort were elevated IgE (81.5%), eczema (71.7%), and eosinophilia (62.9%). Regarding infections, 54.7% of patients had a history of radiologically proven pneumonia, and 28.3% have had other serious infections. History of fungal infection was noted in 53% of cases and skin abscesses in 52.9%. Skeletal or dental abnormalities were observed in 46.2% of patients with a characteristic face being the most commonly reported feature (23.1%), followed by retained primary teeth in 18.9% of patients. Targeted panel sequencing provides a cost-effective first-line genetic screening method which allows for the identification of mutations also in patients with atypical clinical presentations and should be routinely implemented in referral centers.

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