RESUMEN
Aortic root pseudoaneurysm is a devastating complication post aortic valve replacement with a high mortality rate. And dissecting aneurysm into the interventricular septum is a rare variant of aortic root pseudoaneurysm, which is scarcely reported. Multimodal imaging is of great value in its diagnosis and differential diagnosis.
Asunto(s)
Aneurisma Falso , Disección Aórtica , Imagen Multimodal , Tabique Interventricular , Humanos , Aneurisma Falso/diagnóstico por imagen , Aneurisma Falso/complicaciones , Imagen Multimodal/métodos , Tabique Interventricular/diagnóstico por imagen , Disección Aórtica/complicaciones , Disección Aórtica/diagnóstico por imagen , Disección Aórtica/diagnóstico , Aneurisma Cardíaco/etiología , Aneurisma Cardíaco/diagnóstico por imagen , Aneurisma Cardíaco/complicaciones , Diagnóstico Diferencial , Masculino , Válvula Aórtica/diagnóstico por imagen , Ecocardiografía/métodos , Implantación de Prótesis de Válvulas CardíacasRESUMEN
Reducing moisture in sewage sludge is one of the main goals of sewage sludge composting and biodrying. A mathematical model was used to simulate the performance of water removal under different aeration strategies. Additionally, the correlations between temperature, moisture content (MC), volatile solids (VS), oxygen content (OC), and ambient air temperature and aeration strategies were predicted. The mathematical model was verified based on coefficients of correlation between the measured and predicted results of over 0.80 for OC, MC, and VS, and 0.72 for temperature. The results of the simulation showed that water reduction was enhanced when the average aeration rate (AR) increased to 15.37 m(3) min(-1) (6/34 min/min, AR: 102.46 m(3) min(-1)), above which no further increase was observed. Furthermore, more water was removed under a higher on/off time of 7/33 (min/min, AR: 87.34 m(3) min(-1)), and when ambient air temperature was higher.
Asunto(s)
Aire , Desecación/métodos , Modelos Teóricos , Aguas del Alcantarillado/química , Suelo , Cinética , Temperatura , Factores de TiempoRESUMEN
A recyclable plastic bulking agent (RPBA) that can be screened and reused was developed to improve sludge composting and to reduce costs. Two RPBAs were developed: RPBA35 (35 mm in diameter) and RPBA50 (50mm in diameter). The objective was to study the influence of size and quantity of RPBA on temperature, oxygen content, water removal during sludge composting, and phytotoxicity of the compost. RPBAs of both sizes improved the temperature, oxygen supply, and water removal compared with the treatment with no RPBA, and obtained phytotoxic-free compost. RPBA50 more effectively removed water than RPBA35. Oxygen diffusion rate in the composting pile containing RPBA50 was higher than in the treatment with no RPBA. When the RPBA50: sludge mixture ratio was above 1:1.5, the period over which the temperature exceeded 55 °C was insufficient to meet the harmless treatment requirement. The water evaporation rate was highest at a ratio of 1:2.
Asunto(s)
Plásticos/química , Reciclaje , Aguas del Alcantarillado/química , Suelo/química , Purificación del Agua/métodos , Aerobiosis , Biodegradación Ambiental , Brassica/crecimiento & desarrollo , Germinación , Oxígeno/análisis , Tamaño de la Partícula , Temperatura , Agua/química , Purificación del Agua/instrumentaciónRESUMEN
Mechanical aeration is critical to sewage sludge bio-drying, and the actual water loss caused by aeration can be better understood from investigations of the relationship between aeration and water evaporation from the sewage sludge bio-drying pile based on in situ measurements. This study was conducted to investigate the effects of forced air volume on the evaporation of water from a sewage sludge bio-drying pile. Dewatered sewage sludge was bio-dried using control technology for bio-drying, during which time the temperature, superficial air velocity and water evaporation were measured and calculated. The results indicated that the peak air velocity and water evaporation occurred in the thermophilic phase and second temperature-increasing phase, with the highest values of 0.063 ± 0.027 m s(-1) and 28.9 kg ton(-1) matrix d(-1), respectively, being observed on day 4. Air velocity above the pile during aeration was 43-100% higher than when there was no aeration, and there was a significantly positive correlation between air volume and water evaporation from day 1 to 15. The order of daily means of water evaporation was thermophilic phase > second temperature-increasing phase > temperature-increasing phase > cooling phase. Forced aeration controlled the pile temperature and improved evaporation, making it the key factor influencing water loss during the process of sewage sludge bio-drying.