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Ultrasound sludge

Daniele Silvestri, Stanisław Wacławek, Zuzanna Gončuková, Vinod V T Padil, Klaudiusz Grübel, Miroslav Černík
A novel method for assessing the disintegration degree of waste activated sludge (WAS) with the use of differential centrifugal sedimentation method (DCS) was shown herein. The method was validated for a WAS sample at four levels of disintegration in the range of 14.4-82.6% corresponding to the median particle size range of 8.5-1.6 µm. From the several sludge disintegration methods used (i.e. microwave, alkalization, ultrasounds and peroxydisulfate activated by ultrasounds), the activated peroxydisulfate disintegration resulted in the greatest disintegration degree 83% and the smallest median particle size of WAS...
May 16, 2018: Environmental Technology
Barbora Frybova, Jiri Drabek, Jindra Lochmannova, Ladislav Douda, Stepan Hlava, Daniela Zemkova, Vladimir Mixa, Martin Kyncl, Lubos Zeman, Michal Rygl, Radan Keil
PURPOSE: To compare anthropometric data (body mass index [BMI]) in patients without lithiasis to patients with symptomatic simple cholelithiasis or choledocholithiasis. METHODS: We retrospectively reviewed data from 147 patients undergoing laparoscopic cholecystectomy between 2001-2015. Complete growth data from 98 patients was compared with anthropometric data from the population of the Czech Republic and a control group (BMI of 100 consecutive patients without biliary stones in abdominal ultrasound who were admitted to a surgical department for suspected appendicitis)...
2018: PloS One
Nasim Karami, Parviz Mohammadi, Aliakbar Zinatizadeh, Farzaneh Falahi, Nasrin Aghamohammadi
The biomass concentration of conventional activated sludge (CAS) process due to low sludge sedimentation in clarifiers is limited to 3000 mg/L. In this study, high-frequency ultrasound wave (1.8 MHz) was applied to enhance the CAS process performance using high Mixed Liquor Suspended Solid (MLSS) concentration. The study conducted using a pilot scale CAS bioreactor (with and without ultrasound) and their performance for treating a hospital wastewater were compared. Experimental conditions were designed based on a Central Composite Design (CCD)...
September 2018: Ultrasonics Sonochemistry
Meiqiang Cai, Jianqiang Hu, George Wells, Youngwoo Seo, Richard Spinney, Shih-Hsin Ho, Dionysios D Dionysiou, Jie Su, Ruiyang Xiao, Zongsu Wei
No abstract text is available yet for this article.
May 2, 2018: Environmental Science & Technology
Zhili Meng, Zhiwei Zhou, Dan Zheng, Lujian Liu, Jun Dong, Yanling Yang, Xing Li, Tingting Zhang
Sludge dewatering has proven to be an effective method to reduce the volume of sludge. In this study, drinking water treatment sludge (DWTS) was treated by ultra-sonication under variable conditions comparing two sonoreactor types (bath and probe), four frequencies (25, 40, 68, 160 kHz) and four energy density levels (0.03, 1, 3, 5 W/mL). The effects of these conditions were studied using specific resistance to filtration and capillary suction time as measures of dewaterability, and floc size, the Brunauer, Emmett and Teller (BET) specific surface area and Zeta potential to determine treated sludge characteristics...
July 2018: Ultrasonics Sonochemistry
Patricio Neumann, Felipe Barriga, Claudia Álvarez, Zenón González, Gladys Vidal
The aim of this study was to evaluate the performance and digestate quality of advanced anaerobic digestion of sewage sludge including sequential ultrasound-thermal (55 °C) pre-treatment. Both stages of pre-treatment contributed to chemical oxygen demand (COD) solubilization, with an overall factor of 11.4 ± 2.2%. Pre-treatment led to 19.1, 24.0 and 29.9% increased methane yields at 30, 15 and 7.5 days solid retention times (SRT), respectively, without affecting process stability or accumulation of intermediates...
March 15, 2018: Bioresource Technology
Wei Li, Najiaowa Yu, Qian Liu, Yiran Li, Nanqi Ren, Defeng Xing
Sludge disintegration by ultrasound is a promising sludge treatment method. In order to enhance the efficiency of the sludge reduction and hydrolysis, potassium ferrate (K2 FeO4 ) (PF) was used. A novel method was developed to improve the sludge disintegration-sludge pretreatment by using PF in combination with an ultrasonic treatment (PF + ULT). After a short-term PF + ULT treatment, 17.23% of the volatile suspended solids (VSS) were reduced after a 900-min reaction time, which is 61.3% higher than the VSS reduction for the raw sludge...
April 19, 2018: Science of the Total Environment
P R V Praveen Kumar Sunkara, Parth Ketankumar Shah, Kamalesh Rakshit, Shuvro Roy Choudhary, N P Bohidar, Sanjay Kumar Dubey
Pseudoaneurysm (PA) of the cystic artery is rare. Most of the reported cases are iatrogenic and develop secondary to liver biopsy, laparoscopic cholecystectomy, ERCP, and liver transplant. Other reported causes include trauma, malignancy, arteriovenous malformations, and inflammation in the hepatobiliary and pancreatic system. Cystic artery psuedoaneurysm is usually asymptomatic but may also present as vague abdominal pain, intra-abdominal mass, and hemobilia. In the event of rupture, it may present as a catastrophic intra-peritoneal bleeding with hemorrhagic shock...
February 2018: Indian Journal of Surgery
Jessica Y Ng, Jennie Gu
Acute acalculous cholecystitis is an uncommon disease in children and is usually associated with trauma, burns, and infections. Whereas acute acalculous cholecystitis is only seen in 10% of cholecystitis in adults, it is uncommon in the paediatric population. A seven-year-old male presented to the emergency department of a regional hospital with a 36-hour history of right-upper-quadrant abdominal pain. He had associated symptoms of anorexia, nausea, and vomiting. He was septic with raised white cell count and inflammatory markers...
January 20, 2018: Curēus
Mei-Qiang Cai, Jian-Qiang Hu, George Wells, Youngwoo Seo, Richard Spinney, Shih-Hsin Ho, Dionysios D Dionysiou, Jie Su, Ruiyang Xiao, Zongsu Wei
Enhancing activated sludge dewaterability is of scientific and engineering importance in the face of accelerated urbanization and stringent environmental regulations. In this study, we investigated the integration of acidification and ultrasound (A/US) treatment for improving sludge dewaterability at both bench- and pilot-scales. Our results showed that the A/US process exhibited significantly improved sludge dewatering performance, characterized by capillary suction time, cake moisture, and water/solid content of sludge cake...
April 3, 2018: Environmental Science & Technology
Yu Xia, Chao Yang, Tong Zhang
Background: Part-stream low-frequency ultrasound (LFUS) was one of the common practices for sludge disintegration in full-scale anaerobic digestion (AD) facilities. However, the effectiveness of part-stream LFUS treatment and its effect on AD microbiome have not been fully elucidated. Methods: Here we testified the effectiveness of part-stream LFUS pretreatment by treating only a fraction of feed sludge (23% and 33% total solid of the feed sludge) with 20 Hz LFUS for 70 s...
2018: Biotechnology for Biofuels
Carla Serra, Cristina Felicani, Elena Mazzotta, Veronica Gabusi, Valentina Grasso, Antonio De Cinque, Lydia Giannitrapani, Maurizio Soresi
PURPOSE: Conventional grayscale ultrasound (US) is accurate in the diagnosis of gallbladder disease (GD), but in some cases, it is not decisive. Contrast-enhanced ultrasound (CEUS) improves the diagnostic accuracy of US. The primary objective of this study is to assess the reliability of CEUS in the diagnosis of sludge; the secondary objective is to assess the ability of CEUS to diagnose cancer. METHODS: We retrospectively reviewed the US of 4137 patients positive for GD...
February 23, 2018: Journal of Ultrasound
Hui-Ping Zhang, Min Bai, Ji-Ying Gu, Ying-Qian He, Xiao-Hui Qiao, Lian-Fang Du
AIM: To describe contrast-enhanced ultrasound (CEUS) features and evaluate differential diagnosis value of CEUS and conventional ultrasound for patients with benign and malignant gallbladder lesions. METHODS: This study included 105 gallbladder lesions. Before surgical resection and pathological examination, conventional ultrasound and CEUS were performed to examine for lesions. Then, all the lesions were diagnosed as (1) benign, (2) probably benign, (3) probably malignant or (4) malignant using both conventional ultrasound and CEUS...
February 14, 2018: World Journal of Gastroenterology: WJG
Jochen Bandelin, Thomas Lippert, Jörg E Drewes, Konrad Koch
The generation of cavitation fields for the pre-treatment of anaerobic sludge was studied by means of a novel acoustic measuring system. The influence of different reactor dimensions (i.e., choosing reaction chamber widths of 40, 60 and 80 mm) on the cavitation intensity was determined at various solid contents, flow rates and static pressures. Results suggest that the cavitation intensity is significantly reduced by the sonication of liquids with a high solid content. By increasing the pressure to 1 bar, the intensity of bubble implosions can be enhanced and the sound attenuation in the solid fraction is partly compensated compared to ambient pressure...
April 2018: Ultrasonics Sonochemistry
Tao Wang, Diandian Zhang, Yating Sun, Shanshan Zhou, Lin Li, Jingjing Shao
A lab-scale ultrasound enhancing Anammox reactor (R1) was established and irradiated once a week by ultrasound with the optimal parameter (frequency of 25 kHz, intensity of 0.2 W cm-2 and exposure time of 3 min) obtained by batch experiments. R1 and the controlled Anammox reactor (R2) without exposure to the ultrasound were operated in parallel. The start-up period of Anammox process (53 days) in R1 was shorter than that (61 days) in R2. The nitrogen loading-enhancing period (day 53-day 135) in R1 was also shorter than that (day 61-day 151) in R2...
April 2018: Ultrasonics Sonochemistry
Paolo Bargellini, Riccardo Orlandi, Chiara Paloni, Giuseppe Rubini, Paolo Fonti, Cecilia Righi, Mark E Peterson, Mark Rishniw, Cristiano Boiti
Gall-bladder diseases are common in dogs and two-dimensional ultrasonography is a current standard method for diagnosis and treatment planning. However, findings from this modality can be nonspecific. The aim of this retrospective, case series study was to describe conventional and contrast-enhanced ultrasound (using SonoVue® ) findings in a group of dogs with histologically confirmed gall bladder disease. A total of 65 dogs were included. Branchlike, heterogeneous, and homogeneous contrast enhancement of echogenic intraluminal mass-forming lesions was a contrast-enhanced ultrasound characteristic of polypoid lesions due to cystic mucosal hyperplasia of the gallbladder and/or tumor, which had different wash-in and washout characteristics...
February 2, 2018: Veterinary Radiology & Ultrasound
Yechiel Burke, Yinon Gilboa, Moshe Bronshtein
No abstract text is available yet for this article.
February 2018: Prenatal Diagnosis
Shilong He, Xicheng Tan, Xin Hu, Yingxin Gao
To recover oil from crude oil containing sludge is still a research hot topic from the view of sustainability, in which ultrasonic has been proven to be an efficient and environment friendly technique. However, the effect of sludge characteristic on ultrasonic-assisted oil recovery efficiency is little known. In this study, the analysis of variance (ANOVA) was conducted based on six types of crude oily sludge with hydrophilicity and lipophilicity separately and five different ultrasonic operation factors (ultrasonic power (A), frequency (B), time (C), initial temperature (D) and pH (E))...
January 16, 2018: Environmental Technology
Sumit Kumar Singh, Anshu Srivastava, Praveer Rai, Surender K Yachha, Ujjal Poddar
OBJECTIVES: Endoscopic ultrasound (EUS) is an established tool for evaluation of adults with acute recurrent pancreatitis (ARP) whereas data in pediatrics is limited. Our study assessed the role of EUS in identifying etiology including changes of chronic pancreatitis (CP) in children and adolescents with ARP. METHODS: Children with ARP (≥2 episodes of acute pancreatitis [AP]) were prospectively evaluated with a detailed clinical proforma and EUS. Subjects with known etiology of ARP or CP on ultrasonography/computed tomography and magnetic resonance cholangiopancreatography (MRCP, Cambridge grade ≥3) were excluded...
March 2018: Journal of Pediatric Gastroenterology and Nutrition
Napatt Kanjanahattakij, Kamolyut Lapumnuaypol, Sanna Fatima, Eyob Feyssa
Introduction: In general population, gallstone pancreatitis is the most common cause of pancreatitis. However, there are very few literatures that address this topic in post-liver-transplant patients. Clinical Case: A 69-year-old female who had a liver transplant in 2015 due to hepatocellular carcinoma and nonalcoholic steatohepatitis (NASH) cirrhosis. She had a recent episode of acute cellular rejection that was treated with high dose methylprednisolone 1 week prior to admission...
2017: Case Reports in Transplantation
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