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Open AccessArticle

Assessment of Excess Sludge Ultrasonic, Mechanical and Hybrid Pretreatment in Relation to the Energy Parameters

Institute of Water and Wastewater Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
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Water 2018, 10(5), 551; https://doi.org/10.3390/w10050551
Received: 4 March 2018 / Revised: 16 April 2018 / Accepted: 18 April 2018 / Published: 25 April 2018
(This article belongs to the Section Wastewater Treatment and Reuse)
Anaerobic digestion is the most common stabilization process at large sewage treatment plants. To improve its effects, a sludge pre-conditioning process called disintegration is recommended. The aim of the presented study was to compare the direct effects of various types of mechanical disintegration, performed for the same excess sludge, in relation to the energy parameters and effectiveness of the process. Four different disintegration methods were used: mechanical disintegration in semi-technical and laboratory scale homogenizing mixers, ultrasonic disintegration (US) and combined (hybrid) process. The disintegration was performed for volumetric energy EV = 4.67–100 kWh m−3, the results were evaluated based on dispersion (kdCOD, kdCST), lysis (kdSCOD), acidification (kdVFA) and nutrient release (kdTN, kdTP) disintegration indicators. The statistical analysis of the results indicates the influence of disintegrator type (mixer/US/hybrid), scale (laboratory/semi-technical) and energy input on the direct results of disintegration. Hybrid disintegration delivered better direct results than two pre-treatment processes used separately. The efficiency of the hybrid process defined as the increase of the indicator (disintegration products—∆FCOD, ∆SCOD) per unit of energy was considerably higher than for a single stage disintegration process. View Full-Text
Keywords: excess sludge; disintegration; ultrasound; digestion; ultrasonic disintegration; mechanical disintegration excess sludge; disintegration; ultrasound; digestion; ultrasonic disintegration; mechanical disintegration
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Skórkowski, Ł.; Zielewicz, E.; Kawczyński, A.; Gil, B. Assessment of Excess Sludge Ultrasonic, Mechanical and Hybrid Pretreatment in Relation to the Energy Parameters. Water 2018, 10, 551.

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