Bioaerosolization and pathogen transmission in wastewater treatment plants: Microbial composition, emission rate, factors affecting and control measures

Chemosphere ◽  
2021 ◽  
pp. 132180
Author(s):  
Sampriti Kataki ◽  
Rupam Patowary ◽  
Soumya Chatterjee ◽  
Mohan G. Vairale ◽  
Sonika Sharma ◽  
...  
2017 ◽  
Vol 76 (5) ◽  
pp. 1225-1233 ◽  
Author(s):  
M. Schäfer ◽  
I. Hobus ◽  
T. G. Schmitt

In the future, an additional potential of control reserve as well as storage capacities will be required to compensate fluctuating renewable energy availability. The operation of energy systems will change and flexibility in energy generation and consumption will rise to a valuable asset. Wastewater treatment plants (WWTPs) are capable of providing the flexibility needed, not only with their energy generators but also in terms of their energy consuming aggregates on the plant. To meet challenges of the future in regard to energy purchase and to participate in and contribute to such a volatile energy market, WWTPs have to reveal their energetic potential as a flexible service provider. Based on the evaluated literature and a detailed analysis of aggregates on a pilot WWTP an aggregate management has been developed to shift loads and provide a procedure to identify usable aggregates, characteristic values and control parameters to ensure effluent quality. The results show that WWTPs have a significant potential to provide energetic flexibility. Even for vulnerable components such as aeration systems, load-shifting is possible with appropriate control parameters and reasonable time slots without endangering system functionality.


2019 ◽  
Vol 5 (3) ◽  
pp. eaau9124 ◽  
Author(s):  
Katariina M. M. Pärnänen ◽  
Carlos Narciso-da-Rocha ◽  
David Kneis ◽  
Thomas U. Berendonk ◽  
Damiano Cacace ◽  
...  

Integrated antibiotic resistance (AR) surveillance is one of the objectives of the World Health Organization global action plan on antimicrobial resistance. Urban wastewater treatment plants (UWTPs) are among the most important receptors and sources of environmental AR. On the basis of the consistent observation of an increasing north-to-south clinical AR prevalence in Europe, this study compared the influent and final effluent of 12 UWTPs located in seven countries (Portugal, Spain, Ireland, Cyprus, Germany, Finland, and Norway). Using highly parallel quantitative polymerase chain reaction, we analyzed 229 resistance genes and 25 mobile genetic elements. This first trans-Europe surveillance showed that UWTP AR profiles mirror the AR gradient observed in clinics. Antibiotic use, environmental temperature, and UWTP size were important factors related with resistance persistence and spread in the environment. These results highlight the need to implement regular surveillance and control measures, which may need to be appropriate for the geographic regions.


Author(s):  
Gustaf Olsson ◽  
Bengt Andersson ◽  
Bengt Göran Hellström ◽  
Hans Holmström ◽  
Lars Gunnar Reinius ◽  
...  

2009 ◽  
Vol 60 (9) ◽  
pp. 2439-2445 ◽  
Author(s):  
A. Lynggaard-Jensen ◽  
P. Andreasen ◽  
F. Husum ◽  
M. Nygaard ◽  
J. Kaltoft ◽  
...  

Most wastewater treatment plants have several secondary clarifiers or even more sets of clarifiers including several secondary clarifiers, and in practice it is a well known problem that equal distribution of the load to the single clarifier (or set of clarifiers) is very difficult—not to say impossible—to obtain. If the problem is neglected, quite a big percentage of the total clarifier capacity—measured as the max. allowed hydraulic load—can be lost. Further, return sludge rates are seldom controlled by any other means than as a (typically too high) percentage of the inlet to the wastewater treatment plant—giving a varying and too low suspended solids concentration in the return sludge, which again can lead to an unnecessary use of polymer in the pre-dewatering of the surplus sludge taken from the return sludge. A control of the return sludge rate divided into two parts - control of the total return sludge flow and control of how the total flow shall be distributed between the secondary clarifiers - is able to solve the mentioned problems. Finally, as shall be demonstrated on full scale wastewater treatment plants, a considerable increase of the hydraulic capacity of the treatment plants can be obtained.


2020 ◽  
Author(s):  
Maria Cristina Collivignarelli ◽  
Carlo Collivignarelli ◽  
Marco Carnevale Miino ◽  
Alessandro Abbà ◽  
Roberta Pedrazzani ◽  
...  

AbstractAs for the SARS coronavirus in the 2003 epidemic, the presence of SARS-CoV-2 has been demonstrated in faeces and, in some cases, urine of infected people, as well as in wastewater. This paper proposes a critical review of the state of the art regarding studies on the presence of SARS-CoV-2 in wastewater and sewage sludge, the factors affecting its inactivation and the main proposed treatments, with the aim to provide useful information at operative level in order to better and safer manage wastewater and sewage sludge. Given the lack of literature on SARS-CoV-2, studies involving other HCoVs such as SARS-CoV and HCoV-229E have been also considered. In wastewater, the resistance of SARS-CoV has proven to be very limited, especially at temperatures above 20 °C, and the virus has been easily removed with the use of chlorine (> 0.5 mg L−1 for 30 min). For sewage sludge, based on in vitro experiments, it is suggested to increase the retention times before a possible reuse in agriculture only for precautionary purposes, since SARS-CoV-2 is unlikely to occur in the sludge. SARS-CoV-2 in wastewater might track the epidemic trends: although being extremely promising, an effective and wide application of this approach requires a deeper knowledge of the amounts of viruses excreted through the faeces and the actual detectability of viral RNA in sewage.


2020 ◽  
Vol 22 (4) ◽  
pp. 22-27
Author(s):  
Małgorzata Friedrich ◽  
Paulina Mizerna-Nowotna ◽  
Filip Latzke

AbstractThe purpose of the present article was to determine odour emission rate from primary settling tanks after hermetisation. The paper presents the results of the research on odour emission from four settling tanks, covered with self-supporting aluminium domes with a diameter of 52 meters, located on urban wastewater treatment plants, with the planned flow capacity equal to 200 000 m3/day. Altogether, the olfactometry analysis of 189 samples of polluted air pulled from the domes with the use of an air blower which has efficiency of 12 000 m3/h was conducted. The results of odour concentration measurements were in a range of approximately 10 800 to 763 600 ouE/m3. Average odour emission rate was equal to 102 ouE/(s · m2). The obtained value is much higher than the literature data, available for non-hermetised settlers only. This rate enables better estimation of the odour stream that has to be deodorised after sealing the settling tanks.


Author(s):  
Kai Gong ◽  
Zhong Xu ◽  
Zhefeng Cai ◽  
Yuxiu Chen ◽  
Zhanxiang Wang

BACKGROUND During the spread of the novel coronavirus disease (COVID-19), internet hospitals in China were engaged with epidemic prevention and control, offering epidemic-related online services and medical support to the public. OBJECTIVE The aim of this study is to explore the role of internet hospitals during the prevention and control of the COVID-19 outbreak in China. METHODS Online epidemic-related consultations from multicenter internet hospitals in China during the COVID-19 epidemic were collected. The counselees were described and classified into seven type groups. Symptoms were recorded and compared with reported patients with COVID-19. Hypochondriacal suspicion and offline visit motivation were detected within each counselees’ group to evaluate the social panic of the epidemic along with the consequent medical-seeking behaviors. The counselees’ motivation and the doctors’ recommendation for an offline visit were compared. Risk factors affecting the counselees’ tendency of hypochondriacal suspicion and offline visit motivation were explored by logistic regression models. The epidemic prevention and control measures based on internet hospitals were listed, and the corresponding effects were discussed. RESULTS A total of 4913 consultations were enrolled for analysis with the median age of the counselees at 28 years (IQR 22-33 years). There were 104 (2.12%) healthy counselees, 147 (2.99%) hypochondriacal counselees, 34 (0.69%) exposed counselees, 853 (17.36%) mildly suspicious counselees, 42 (0.85%) moderately suspicious counselees, 3550 (72.26%) highly suspicious counselees, and 183 (3.72%) severely suspicious counselees. A total of 94.20% (n=4628) of counselees had epidemic-related symptoms with a distribution similar to those of COVID-19. The hypochondriacal suspicion (n=2167, 44.11%) was common. The counselees’ motivation and the doctors’ recommendation for offline visits were inconsistent (<i>P</i>&lt;.001) with a Cohen kappa score of 0.039, indicating improper medical-seeking behaviors. Adult counselees (odds ratio [OR]=1.816, <i>P</i>&lt;.001) with epidemiological exposure (OR 7.568, <i>P</i>&lt;.001), shortness of breath (OR 1.440, <i>P</i>=.001), diarrhea (OR 1.272, <i>P</i>=.04), and unrelated symptoms (OR 1.509, <i>P</i>&lt;.001) were more likely to have hypochondriacal suspicion. Counselees with severe illnesses (OR 2.303, <i>P</i>&lt;.001), fever (OR 1.660, <i>P</i>&lt;.001), epidemiological exposure history (OR 1.440, <i>P</i>=.01), and hypochondriacal suspicion (OR 4.826, <i>P</i>&lt;.001) were more likely to attempt an offline visit. Reattending counselees (OR 0.545, <i>P</i>=.002) were less motivated to go to the offline clinic. CONCLUSIONS Internet hospitals can serve different types of epidemic counselees, offer essential medical supports to the public during the COVID-19 outbreak, reduce the social panic, promote social distancing, enhance the public’s ability of self-protection, correct improper medical-seeking behaviors, reduce the chance of nosocomial cross-infection, and facilitate epidemiological screening, thus, playing an important role on preventing and controlling COVID-19.


1993 ◽  
Vol 27 (12) ◽  
pp. 71-115 ◽  
Author(s):  
P. Harremoës ◽  
A. G. Capodaglio ◽  
B. G. Hellström ◽  
M. Henze ◽  
K. N. Jensen ◽  
...  

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