Bioleaching of hazardous waste

2015 ◽  
Vol 69 (9) ◽  
Author(s):  
Klára Drobíková ◽  
Lucia Rozumová ◽  
Hana Otoupalíková ◽  
Jana Seidlerová
Keyword(s):  
Sequential Extraction ◽  
Hazardous Waste ◽  
Waste Disposal ◽  
Flue Gas ◽  
Bottom Ash ◽  
Bacterial Activity ◽  
Gas Cleaning ◽  
Waste Incinerators ◽  
Environmentally Friendly Method ◽  
Exchangeable Form

AbstractLandfill represents the least environmentally-friendly method of waste disposal because of possible pollution to the environment. Dangerous wastes pose the greatest problems and are often disposed of by combustion. This process reduces their volume but entails the formation of new types of dangerous waste. The present study focuses on the possibilities of the removal of the hazardous properties of waste originating from hazardous waste incinerators (three types of bottom ash and charcoal from flue gas cleaning) by bioleaching. Toxic pollutants originating from waste could be removed by bioleaching with Acidithiobacillus ferrooxidans. The effectiveness of bioleaching was evaluated on the basis of the pollutant content in the aqueous leachates. For studying the relation between the efficiency of bioleaching and the binding of pollutants in the waste, Tessier’s sequential extraction was used. A comparison of bioleaching efficiency and the results of sequential extraction shows that bioleaching can be used to remove elements which are in an exchangeable form or are bound to carbonates, meaning that they are bound in bio-available forms. Bacterial activity was also shown to change the bonds of pollutants in wastes, leading to increased solubility of the pollutant.

Stabilization of waste bottom ash generated from hazardous waste incinerators

2015 ◽  
Vol 3 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Lucia Rozumová ◽  
Oldřich Motyka ◽  
Kristína Čabanová ◽  
Jana Seidlerová
Keyword(s):  
Hazardous Waste ◽  
Bottom Ash ◽  
Waste Incinerators

Effect of CaO and Fe2O3 on Partitioning of As and S within Ash Fractions from Fluidised-Bed Co-Combustion of Coal and Wastes

2018 ◽  
Vol 11 (1) ◽  
pp. 81-90
Author(s):  
Lucie Bartoňová
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Coal Combustion ◽  
Bottom Ash ◽  
Correlation Coefficients ◽  
Fluidised Bed ◽  
Solid Product ◽  
Gas Cleaning

Possible interaction of volatilized As and S with CaO and Fe2O3 (creating solid product) could efficiently improve coal combustion flue gas cleaning. For this reason, S-CaO, As-CaO, S- Fe2O3 and As- Fe2O3 relationships were evaluated in bottom ash and fly ash fractions from fluidised-bed co-combustion of coal and wastes (and limestone as desulphurization additive) through calculation of correlation coefficients and composition of magnetic concentrates. It was concluded that S exhibited a dominant association with CaO while As exhibited affinity to both CaO and Fe2O3 - the significance differed a little in bottom ash and fly ash. In the bottom ash, the affinity of As to CaO was more significant, while in the fly ash the association to Fe2O3 slightly prevailed.

scholarly journals Release of Trace Elements from Bottom Ash from Hazardous Waste Incinerators

Recycling ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 36 ◽  
Author(s):  
Tran Dung ◽  
Elvira Vassilieva ◽  
Rudy Swennen ◽  
Valérie Cappuyns
Keyword(s):  
Trace Elements ◽  
Hazardous Waste ◽  
Ethylenediaminetetraacetic Acid ◽  
Solid Phase ◽  
Bottom Ash ◽  
Treatment Strategies ◽  
Waste Incineration ◽  
Leaching Tests ◽  
Waste Incinerators ◽  
Hazardous Waste Incineration

Bottom ash is the major by-product of waste incineration and can contain trace elements (As, Cd, Co, Cu, Cr, Mo, Ni, Pb, and Zn) with concentrations up to thousands of mg·k−1. In this study, a combination of different extractions and leaching tests (i.e., CH3COOH and ammonium-EDTA (Ethylenediaminetetraacetic acid) extractions and pHstat leaching tests) was used to investigate the potential release of trace elements from bottom ash samples derived from hazardous waste incineration plants. Although large variations have been found in the release of trace elements by different extractions, in general, the highest concentrations of most trace elements (except As and Mo) were released with the CH3COOH extraction, whereas the release of As and Mo was highest with the ammonium-EDTA extraction. Kinetics of element release upon acidification based on a pHstat leaching test at pH 4 could be related to the solid-phase speciation of some selected trace elements. The relatively high-potential mobility and elevated total concentrations of some trace elements imply a threat to the environment if these bottom ashes are not treated properly. Results of the present study may be useful to develop potential treatment strategies to remove contaminants and eventually recover metals from bottom ash.

scholarly journals Fate of nano titanium dioxide during combustion of engineered nanomaterial-containing waste in a municipal solid waste incineration plant

2019 ◽  
Vol 37 (10) ◽  
pp. 1033-1042 ◽  
Author(s):  
Jürgen Oischinger ◽  
Martin Meiller ◽  
Robert Daschner ◽  
Andreas Hornung ◽  
Ragnar Warnecke
Keyword(s):  
Titanium Dioxide ◽  
Municipal Solid Waste ◽  
Flue Gas ◽  
Bottom Ash ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Incineration Plant ◽  
Gas Cleaning ◽  
Engineered Nanomaterial ◽  
Nano Titanium Dioxide

The market for products containing engineered nanomaterial (ENM) is constantly expanding. At the end of their lifecycle, a significant fraction of the products will be disposed as ENM-containing waste in thermal treatment plants. Up to now there are still uncertainties on the fate and behaviour of ENM during waste incineration. In our investigations, nano titanium dioxide (nTiO2) was selected as an example for ENM, because of its high amount in consumer products and its relevance to the ENM-containing waste stream. Two test series were conducted at the municipal solid waste incineration plant “Gemeinschaftskraftwerk Schweinfurt”. For each test series, background concentrations of titanium were measured first. Samples of bottom ash, bottom ash extractor water, fly ash (boiler ash, cyclone ash), flue gas cleaning products (spray absorber ash, fabric filter ash) and washing water from the wet scrubber were taken in order to determine the fate of nTiO2. The flue gas was sampled at three points: after boiler, after cyclone and before stack. The experiments showed that most of the used reference material was located in the solid residues (i.e. bottom ash) while a smaller part was detected in the products of the flue gas cleaning. In the purified flue gas before the stack, the concentration was negligible. The flue gas cleaning system at the Gemeinschaftskraftwerk Schweinfurt complies with the requirements of the best available techniques and the results cannot be transferred to plants with lower standards.

Sign in / Sign up

Export Citation Format

Share Document