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Life Cycle Assessment of the Mixed Municipal Waste Management System Based on Mechanical-Biological Treatment

Kossakowska Karolina, Grzesik Katarzyna

Journal of Ecological Engineering

2019

Vol. 20, nr 8

175--183

The aim of this study was to identify and assess the potential environmental impacts caused by mixed municipal solid waste management system based on mechanical-biological treatment technology in Rybnik, Poland. The study is based on life cycle assessment methodology, with application of EASETECH model. The system elements that were taken under consideration are the collection and transportation of MSW (municipal solid waste); MBT plant (mechanical and biological treatment), transportation between system elements, landfilling with LFG (landfill gas) collection system and gas combustion in flare. The adopted functional unit is 1 Mg of mixed municipal waste generated in Rybnk.

Treatment of Pool Water Installation Washings in A Flocculation/Ultrafiltration Integrated System

Łaskawiec E., Dudziak M., Wyczarska-Kokot J.

Journal of Ecological Engineering

2017

Vol. 18, nr 5

96--103

The article presents the possibilities of employing an integrated flocculation/ultrafiltration system in the treatment of washings generated upon the rinsing of filter beds in pool water installations. Single ultrafiltration process was used as a comparator. Flocculation was carried out using commercial dialuminium pentahydroxychloride solution widely used at pool facilities for the removal of contaminants in flocculation processes. The studies consisted in determination of correlations between the conditions of the flocculation process (variable doses of Al3+ ions: from 4 to 280 mg/L) and the transport/separation characteristics of ultrafiltration membranes. Flocculation was performed at different temperatures of washings i.e. 8, 21, and 30°C for each of the pre-defined doses. Ultrafiltration was highly capable of reducing the turbidity of washings and removing a large group of contaminants as determined by turbidimetry and UV254 absorbance measurements. The studies revealed that the best transport/ separation characteristics of ultrafiltration membranes were obtained in a system in which ultrafiltration was performed following flocculation of washings carried out at 21°C using a 40 mgAl3+/L solution. The turbidity was reduced by ca. 99% and UV absorption was reduced by ca. 94% while the relative volumetric stream of the permeate increased by more than 35% (as compared to the filtration of washings in a single-process system). Membrane ultrafiltration significantly increased the quality of the waste stream consisting of washings from the pool water installation. Pre-processing of washings is required before ultrafiltration in order to limit the blocking of membrane pores. Flocculation may be one of such pre-processing methods.