Comparison of different anaerobic model reactors

According to characteristics of microbial growth, anaerobic treatment processes can be classified in two major groups: fixed-film and suspended growth. In this study, operational conditions for both fixed-film (Downflow Stationary Fixed Film, DSFF and Upflow Anaerobic Filter, UAF) and suspended growth (Thermophilic Anaerobic Contact Reactor, TACR) model anaerobic reactors are presented and chemical oxygen demand (COD) removal efficiencies of these systems are compared

Current Situation and Future Perspectives in Municipal Wastewater Treatment and Sludge Management in Turkey

Appropriate management of wastewater and sludge requires several systems. One of these systems is the collection of data about generation rates and characteristics of sludge. This paper aims to summarize the work done as a part of a threeyear project requested by the Turkish Ministry of Environment and Urbanization. Efforts involved preparation and evaluation of a detailed questionnaire for currently operated wastewater treatment plants (INWTPs) in Turkey, collection and confirmation of information from visits to large scale plants, calculation of theoretical sludge generation rates from data provided, and its comparison to reported sludge amounts

Studies on the Chemical Stabilisation of Digestate from Mechanically Recovered Organic Fraction of Municipal Solid Waste

This study aims to explore an innovative approach consisting of the Fenton's process to stabilise organic wastes as an alternative to the traditional aerobic decomposition (composting). Digestate from the anaerobic digestion of the organic fraction of municipal solid wastes was taken from a mechanical-biological treatment plant and was thoroughly characterised regarding physical, chemical and biological properties. This sludge contained around 7.8 g Fe kg TS-1, which can be beneficial to the chemical oxidation. However, the use of zero-valent iron nanoparticles or iron(II) salt revealed treatment can be improved by adding extra iron into the system. The response surface methodology determined that the best peroxidation conditions were 35.6 g H2O2 kg TS-1 and 33.1 g Fe2+ kg TS-1, while maintaining constant pH 3, L/S 5 and room temperature. The chemical treatment enhanced the stability, reducing the oxygen uptake rate from 4.63 to 2.57 g O-2 kg VS-1 h(-1). Moreover, the germination index increased from 37 to 99.9 %, which means the treatment yielded a non-phytotoxic product. The outcomes of the present study are promising and open a new pathway for the Fenton peroxidation in semi-solid processes since this fast method can be very competitive when compared with the slow composting technology