Dynamic modelling of a single-stage high-rate anaerobic reactor—I. Model derivation

1991 ◽  
Vol 25 (7) ◽  
pp. 847-858 ◽  
Author(s):  
D.J. Costello ◽  
P.F. Greenfield ◽  
P.L. Lee
1991 ◽  
Vol 25 (7) ◽  
pp. 859-871 ◽  
Author(s):  
D.J. Costello ◽  
P.F. Greenfield ◽  
P.L. Lee

2001 ◽  
Vol 43 (8) ◽  
pp. 83-90 ◽  
Author(s):  
A. C. Pinto Filho ◽  
C. C. Brandão

A bench scale study was carried out in order to evaluate the applicability of dissolved air flotation (DAF) as an advanced treatment for effluents from three different domestic wastewater treatment processes, namely: (i) a tertiary activated sludge plant ; (ii) an upflow sludge blanket anaerobic reactor (UASB); and (iii) a high-rate stabilization pond.


Author(s):  
Vishal H. Chandak ◽  
Ketan J. Khatri ◽  
Shraddha H. Chandak

<p class="abstract"><strong>Background:</strong> Congenital talipes equinovarus is one of the commonest congenital anomalies. In developing countries like India especially in the rural population still there are many myths, culture and awareness issues regarding this deformity. Many patients get initial treatment with casting but tend loose follow ups in this prolonged treatment. To give optimal results in these scenarios, the technique for single stage procedure which includes bony and soft tissue repair gives excellent results.</p><p class="abstract"><strong>Methods:</strong> In a retrospective longitudinal study, 13 children with neglected clubfeet were involved. Valid consent, clinical and radiological evaluation was done. Patients underwent single stage (bony and soft tissue) procedure described in the study. Post operatively data was collected and scoring was done as per International clubfoot study group (ICSG) at each follow ups.<strong></strong></p><p class="abstract"><strong>Results:</strong> A total 13 children out of whom 9 were male and 4 females, all having unilateral deformity were studied. The age group was between 5-22 years (mean 13.5). Postoperatively, the children were followed at 6 months intervals. As per ICSG score 10 patients had excellent results, 3 patients had good results and none had poor results. 2 patients had minor complication - delayed wound healing (2-3 weeks).</p><p class="abstract"><strong>Conclusions:</strong> Treatment of neglected clubfoot using single stage procedure dorsal close wedge osteotomy with soft tissue release has a high rate of good and excellent results, with low frequency of complications. It is a good alternative to conventional procedures for management of neglected clubfeet in developing countries, where compliance of patient is a problem.</p>


1999 ◽  
Vol 40 (11-12) ◽  
pp. 169-177 ◽  
Author(s):  
S. Ghosh ◽  
D. C. Taylor

Kraft primary and mixed primary-activated sludges were gasified by thermophilic (50 °C) high-rate and mesophilic two-phase digestion. Kraft sludges were deficient in nitrogen, phosphorus, and other unidentified nutrients. Municipal sludge proved to be a much better nutrient source than inorganic salts. Performance of the mesophilic (35°C), two-phase anaerobic digestion (TPAD) system was about the same as that of thermophilic single-stage, high-rate digestion at a 10-day HRT as judged in terms of methane yield (0.17 SCM/kg VS added) and VS reduction efficiency (43%). The mesophilic TPAD process yielded a higher methane-content (65%) fuel gas; it is capable of exhibiting higher net-energy recovery efficiency than thermophilic single-stage digestion.


2017 ◽  
Vol 24 ◽  
pp. 457-466 ◽  
Author(s):  
Muhammadu Bello ◽  
Panneerselvam Ranganathan ◽  
Feargal Brennan

2013 ◽  
Vol 68 (3) ◽  
pp. 514-521 ◽  
Author(s):  
A. G. Mutlu ◽  
A. K. Vangsgaard ◽  
G. Sin ◽  
B. F. Smets

Start-up and operation of single-stage nitritation–anammox sequencing batch reactors (SBRs) for completely autotrophic nitrogen removal can be challenging and far from trivial. In this study, a step-wise procedure is developed based on stoichiometric analysis of the process performance from nitrogen species measurements to systematically guide start-up and normal operation efforts (instead of trial and error). The procedure is successfully applied to laboratory-scale SBRs for start-up and maintained operation over an 8-month period. This analysis can serve as a strong decision-making tool to take appropriate actions with respect to reactor operation to accelerate start-up or ensure high-rate N removal via the nitritation–anammox pathway.


2020 ◽  
Author(s):  
samuel fulton minor ◽  
Carl J Brown ◽  
Paul S Rooney ◽  
jason p hodde ◽  
lisa julien ◽  
...  

Abstract Background: Single-stage repair of incisional hernias in contaminated fields has a high rate of surgical site infection (30-42%) when biologic grafts are used for repair. In an attempt to decrease this risk, a novel graft incorporating gentamicin into a biologic extracellular matrix derived from porcine small intestine submucosa was developed. Methods: This prospective, multicenter, single-arm observational study was designed to determine the incidence of surgical site infection following implantation of the device into surgical fields characterized as CDC Class II, III, or IV. Results: Twenty-four patients were enrolled, with 42% contaminated and 25% dirty surgical fields. After 12 months, 5 patients experienced 6 surgical site infections (21%) with infection involving the graft in 2 patients (8%). No grafts were explanted. Conclusions: The incorporation of gentamicin into a porcine-derived biologic graft can be achieved with no noted gentamicin toxicity and a low rate of device infection for patients undergoing single-stage repair of ventral hernia in contaminated settings. Trial Registration: The study was registered March 27, 2015 at www.clinicaltrials.gov as NCT02401334.


2021 ◽  
pp. 127395
Author(s):  
Ahmed Tawfik ◽  
Khaled Hasanan ◽  
Mahmoud Abdullah ◽  
Omnia A. Badr ◽  
Hanem M. Awad ◽  
...  
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