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1
Content available Sludge-derived biochar : a review on the influence of synthesis conditions on environmental risk reduction and removal mechanism of wastewater pollutants
Lv Ming Yi, Yu Hui Xin, Shang Xiao Yuan
Archives of Environmental Protection
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2023
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Vol. 49, no 2
3--15
EN
In the context of resource utilization, the applications of waste biomass have attracted increasing attention. Previous studies have shown that forming biochar by heat treatment of sludge could replace the traditional sludge disposal methods, and sludge biochar is proved to be efficient in wastewater treatment. In this work, the pyrolysis, hydrothermal carbonization and microwave pyrolysis methods for preparing sludge biochar were reviewed, and the effects of different modification methods on the performance of sludge biochar in the synthesis process were comprehensively analyzed. This review also summarized the risk control of heavy metal leaching in sludge biochar, increasing the pyrolysis temperature and use of the fractional pyrolysis or co-pyrolysis were usually effectively meathods to reduce the leaching risk of heavy metal in the system, which is crucial for the wide application of sludge biochar in sewage treatment. At the same time, the adsorption mechanism of sludge biochar and the catalytic mechanism as the catalytic material in AOPs reaction, the process of radical and non-radical pathway and the possible impacts in the sludge biochar catalytic process were also analyzed in this paper.
2
Content available Co-pyrolysis of PCB and cotton stalk: Towards enhanced phenol production and debromination of pyrolysis oil
Prajapati Sonalben B., Gautam Alok, Gautam Shina
Chemical and Process Engineering
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2022
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Vol. 43, nr 2
203–-216
EN
With advancing technology, printed circuit board (PCB), one of the most important components of e-waste, has become a source of pollution due to an ineffective waste management system. This problem can be solved by converting PCB waste into a valuable product which will emerge to maximize the renewable energy supplies. In this aspect, co-pyrolysis is advantageous in both simple and successful in producing high-quality pyrolysis oil. In this paper, cotton stalk (CS) as biomass was used and pyrolysis of PCB, CS, and a mixture of both in 1:1 have been carried out. CS has a good combustibility at 500 C which was chosen for the pyrolysis reaction in a fixed bed reactor for slow pyrolysis. The pyrolytic oil was analysed by GC–MS and FTIR. The results indicate that there is an increase in oil yield from 19.6% to 27.5% by weight and phenol and phenolic compounds in oil of co-pyrolysis from 60.94% to 76.82% compared to literature available. There is an increase in bromine solidification in char by 25% with a mixture of CS and PCB compared to CS and PCB individually which is much higher than literature data. To the best of the authors’ knowledge, co-pyrolysis of PCB:CS has been attempted first time and debromination of oil was found excellent in the present work.
3
Content available Investigation on co-pyrolysis of sewage sludge with coal
Tan Z.-X., Ai P., Li Y.-M., Ji X.-Y., Feng W.
Environment Protection Engineering
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2014
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Vol. 40, nr 1
117--126
EN
Co-pyrolysis characteristics of sludge with coal and sludge briquetted with coal were studied by the TG-FTIR method. From TG data, weight loss of sludge briquetted was higher than that of sludge and sludge and coal which means that thermal reaction effect of sludge briquetted is better than those of other two materials. Gas products of pyrolysis were CO, CO2, H2O, alcohol, ketone, acid, hydrocarbon, amine and azine from the FTIR analysis. At last, evolving patterns of the pyrolyses and the yields of their gas products have been recorded, providing extremely important data on the mechanism of the process.
4
Content available Przemysłowe testy kopirolizy stałych paliw wtórnych (SRF) z węglem kamiennym
Rejdak M., Wasielewski R.
Archiwum Gospodarki Odpadami i Ochrony Środowiska
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2013
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Vol. 15, nr 1
29--36
PL
Przedstawiono wyniki przemysłowych testów kopirolizy stałych paliw wtórnych (SRF) z węglem kamiennym. Badania przeprowadzono w skali skrzynkowej w baterii koksowniczej stosującej system wsadu ubijanego. Koksowano 3 wsady koksownicze: bez dodatku SRF oraz z 2 i 4% udziałem SRF we wsadzie. Wyniki badań wykazały, że dodatek SRF do wsadu koksowniczego powoduje istotne pogorszenie parametrów jakościowych koksu w tym szczególnie jego wyt rzymałości mechanicznej określanej wg metody Micum
EN
The results of industrial tests of co-pyrolysis solid recovered fuels and hard coal have been presented. Investigation was carried out in stamp charged coke oven battery in box scale. Three coking blends were coking: coking blend without SRF additive, coking blend with 2% of SRF and coking blend with 4% of SRF. The investigation shows that SRF additives causes deterioration of coke quality parameters, particularly the mechanical strength based on Micum method.
5
Content available remote Badania nad termicznym odzyskiem odpadowych jonitów w procesie kopirolizy
Wasielewski R., Sobolewski A.
Przemysł Chemiczny
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2010
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T. 89, nr 6
787-792
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