en en en en en en en en en en en en en en en en en it en en en de en en en en en es en zh en en en en en en en en en en en en en en en en en en en en mt en en en en nl de sv fr en en en en
Estimation of Microbiological Status of Sewage Sludge Subject to Composting Process in Controlled Conditions
About the Journal In Memory of Professor Jerzy Radecki Editorial Office Editorial Board Scope Impact Factor Indexed in... Journal Impact Factor contributing items Contact Subscription Current issue Online first Notes to Authors Frequently Asked Questions Submission Archive
Estimation of Microbiological Status of Sewage Sludge Subject to Composting Process in Controlled Conditions
Department of Agricultural Microbiology, University of Life Sciences in Poznań, Szydłowska 50, 65-656 Poznań, Poland
Pol. J. Environ. Stud. 2009;18(2):279–288
Microbiological characteristics of sewage sludge from a mechanical-and-biological sewage treatment plant composted in controlled conditions with straw and sawdust are presented. Prepared composts were placed in four bioreactors with airflow of 4 l air·min-1. In bioreactor K1, K2 and K3 the composted mass consisted of 65% sewage sludge (K1–sewage sludge 1, K2 – sludge 2, K3 – sludge 3) + 30% sawdust + 5% straw; while in bioreactor K4 the proportion was: 45% sludge 2 + 50% sawdust + 5% straw. Compost samples were taken from all chambers at the same time, depending on actual temperature. Microbiological analyses consisted in the determination (by plate method) on selective media of the numbers of mesophilic and thermophilic bacteria, fungi and pathogenic bacteria Salmonella sp. Clostridium perfringens and Enterobacteriaceae. Furthermore, in the experiment, the activity levels of dehydrogenase were determined using 1% triphenyltetrazole chloride as substratum. Studies have indicated that the composting process caused a decrease of the number of fungi and pathogenic bacteria from Enterobacteriaceae family and Clostridium perfringens in all composted matters, as well as an increase in the number of thermophilic bacteria. Changes in the number of mesophilic bacteria depended on the compost type. In composts K1 and K2, the composting process caused an increased proliferation of cells, while in the composts K3 and K4 the number of mesophilic bacteria decreased. On the basis of the obtained results, it was also found that in the majority of analysis terms, the lowest activity of dehydrogenases occurred in compost K3, while their level of its activity, in the majority of the studied composts, correlated most intensively with the number of thermophilic bacteria.
Decomposition Characteristics of Selected Solid Organic Wastes by Black Soldier Fly (BSF) Larvae as Affected by Temperature Regimes
Migration and Accumulation of Heavy Metals in a Chicken Manure-Compost-Soil-Apple System
Using Selected Types of Waste to Produce New Light Ceramic Material
Changes in Soil Enzymatic Activity Caused by Hydric Stress
Organochlorine Pesticides in Selected Sewage Sludge in South Africa : Assessment and Method Validation
© 2006-2022 Journal hosting platform by Bentus
We process personal data collected when visiting the website. The function of obtaining information about users and their behavior is carried out by voluntarily entered information in forms and saving cookies in end devices. Data, including cookies, are used to provide services, improve the user experience and to analyze the traffic in accordance with the Privacy policy. Data are also collected and processed by Google Analytics tool (more).
You can change cookies settings in your browser. Restricted use of cookies in the browser configuration may affect some functionalities of the website.