Microwave-assisted pyrolysis of textile dyeing sludge, and migration and distribution of heavy metals

Zhang, Hedong; Gao, Zuopeng; Liu, Yang; Ran, Chunmei; Xiao, Mao; Kang, Qinhao; Ao, Wenya; Fu, Jie; Li, Jing; Liu, Guangqing; Dai, Jianjun

doi:10.1016/j.jhazmat.2018.04.080

Cited by 89 publications

(19 citation statements)

References 31 publications

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“…This leads to a higher yield of biogas (Beszédes et al, 2009). Literature data show that the use of microwave methods has positive results also in dry methods, such as pyrolysis (Zhang et al 2018) as well as non-hydrolyzing wet torrefaction (Zheng et al 2020).…”

Section: Microwave-assisted Methodsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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This literature review outlines the most important—agricultural and non-agricultural—types of sewage sludge management. The potential of waste sludge protein hydrolysates obtained by chemical sludge conditioning was reported. The discussed areas include acidic and alkaline hydrolysis, lime conditioning, polyelectrolyte dewatering and other supporting techniques such as ultrasounds, microwave or thermal methods. The legislative aspects related to the indication of the development method and admission to various applications based on specified criteria were discussed. Particular attention was devoted to the legally regulated content of toxic elements: cadmium, lead, nickel, mercury, chromium and microelements that may be toxic: copper and zinc. Various methods of extracting valuable proteins from sewage sludge have been proposed: chemical, physical and enzymatic. While developing the process concept, you need to consider extraction efficiency (time, temperature, humidity, pH), drainage efficiency of post-extraction residues and directions of their management. The final process optimization is crucial. Despite the development of assumptions for various technologies, excess sewage sludge remains a big problem for sewage treatment plants. The high costs of enzymatic hydrolysis, thermal hydrolysis and ultrasonic methods and the need for a neutralizing agent in acid solubilization limit the rapid implementation of these processes in industrial practice. Graphical abstract

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Section: Microwave-assisted Methodsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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“…The concentration of Zn in the raw sludge was the highest among the heavy metals detected probably due to the widespread use of zinc-plating pipes in wastewater treatment plants in China (Zhang et al 2018). The total concentration of Zn decreased slightly after microwave treatment at 80-140°C.…”

Section: Migration and Transformation Of Heavy Metals In The Sewage Sludgementioning

confidence: 98%

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Qiu

Zheng

Wang

et al. 2021

Water Science and Technology

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The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in the sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solid, was also explored. The results showed that the migration of heavy metals between solid-liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilization of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C.

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“…A indústria têxtil é o segundo setor mais poluente do mundo, respondendo por 10% do total das emissões mundiais de carbono (Echeverria, Handoko, Pahlevani, & Sahajwalla, 2019). Além disso, os estudos recentemente mostraram que a reutilização e reciclagem de têxteis em geral pode reduzir o impacto ambiental em comparação com a incineração e aterro (Sandin & Peters, 2018;Zhang et al, 2018;Yousef et al, 2019). Um dos problemas ambientais dominantes para a indústria do vestuário é a produção de resíduos durante os processos de corte.…”

Section: Introductionunclassified

Alternativas de reutilização de resíduos têxteis

Velicko

Amrginski

Hemkemeier

2020

RSD

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Os produtos têxteis são indispensáveis no cotidiano, estando presentes em diversos formatos e características. No entanto, a indústria têxtil é o segundo maior poluente do mundo devido as poucas técnicas de reutilização e reciclagem que acarretam grandes impactos ambientais. Dados mostram que a reciclagem dos resíduos têxteis não chega a 25% do que é gerado, assim, produzindo cerca de 1,2 bilhões de toneladas de emissões de gases de efeito estufa por ano. A reciclagem dos resíduos têxteis é considerada de grande necessidade e viabilidade na concretização do conceito de economia circular, porém é desafiadora, especialmente porque estes resíduos geralmente são misturados com outras fibras. Neste sentido, o presente trabalho apresenta o conceito de economia circular relacionado a indústria têxtil e as formas de reciclagem de tecidos, visando a redução dos impactos ambientais. A economia circular, apresenta um modelo capaz de desvincular o crescimento econômico da geração de resíduos, transformando-os em novos produtos e materiais com a máxima eficiência objetivando chegar a um modelo econômico com desperdício zero, imprescindível para alcançar um crescimento sustentável. A transição para uma economia circular deve começar com a prevenção de resíduos e a minimização dos resíduos depositados em aterro e finalmente a implantação de processos de reciclagem. Os diferentes processos de reciclagens se apresentaram como promissores no sentido de contribuir de forma significativa com a economia circular. As principais tecnologias de reciclagem, de resíduos têxteis, compreendem o processo de moldagem por compressão a quente, o processo de reciclagem mecânica e o processo de reciclagem química.

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Microwave-assisted pyrolysis of textile dyeing sludge, and migration and distribution of heavy metals

Cited by 89 publications

References 31 publications

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Alternativas de reutilização de resíduos têxteis

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