Application of sludge-based biochar generated by pyrolysis: A mini review

Deng, Yi; Huang, Qing; Gu, Weihua; Li, Shuyuan

doi:10.1080/15567036.2020.1826602

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…In the scientific background, most of the studies on adsorption are based on synthetic aqueous solutions and simulated WW containing single pollutants. As Deng et al [59] and Rangabhashiyam et al [60] pointed out, these limitations should be overcome. The strengths of this work were (i) the use of real WW from full-scale WWTPs containing simultaneously different pollutants, (ii) the comparison of different thermochemical treatments during biochar preparation, and (iii) the evaluation of the simultaneous removal of single and multi-component pollutants.…”

Section: Future Outlooksmentioning

confidence: 99%

Survey on Lombardy Region Wastewater Effluents and Application of Biochar from Biological Sewage Sludge for Wastewater Treatment

Collivignarelli,

Caccamo,

Bellazzi

et al. 2023

Water

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Due to decreasing rainfall, drought is an environmental problem becoming even more alarming every year. The direct reuse of treated wastewater (WW), in compliance with current legislation, can be one of the applicable solutions to deal with water scarcity. In this study, an analysis of wastewater treatment plants (WWTPs) (>400 population equivalent) in the Lombardy region (Northern Italy) was performed to identify the most critical parameters in their effluents (total and ammonia nitrogen, and phosphorous). Biochar filters, as final adsorption means for WWTP effluents, could improve water quality for direct reuse. Biochar from biological sewage sludge produced by an urban WWTP (130,000 population equivalent) was prepared via pyrolysis (350–650–950 °C) and chemical activation with KOH. In each preparation step, the material was analyzed to follow the physicochemical transformations. The removal efficiency of COD, N-NH4+, N-NO3-, and P from real WW was studied using batch adsorption tests. Pyrolysis at 650 °C + KOH activation guaranteed higher yields for N-NH4+ (32%), P (44%), and N-NO3− (66%) with a contact time in the batch test of 6 h for N-NH4+ and P, and 3 h for N-NO3−. Up to 50% COD removal was achieved in 6 h with 950 °C pyrolyzed + KOH-activated biochar.

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Section: Future Outlooksmentioning

confidence: 99%

Survey on Lombardy Region Wastewater Effluents and Application of Biochar from Biological Sewage Sludge for Wastewater Treatment

Collivignarelli,

Caccamo,

Bellazzi

et al. 2023

Water

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“…Biomass can be obtained from plants, animals, and industrial wastes [2,3]. In other words, industrial wasted, animal or human manure, organic wastes, municipal sludge, and food residue, among others, can be used as raw materials for producing BC [4][5][6]. The type of biomass bears an influence on the physical-chemical properties of BC: surface area, capacity of exchanging cations, water retention capacity as well as pore size and distribution [7].…”

Section: Introduction 1biocharmentioning

confidence: 99%

Use of Biochar in Asphalts: Review

et al. 2022

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The growth of the world population has increased the production of wastes. These are generally incinerated or deposited in outdoor landfills, which impacts the environment and affects human health. A technique that allows to reuse of wastes and diminishes adverse effects on the environment is pyrolysis. Through this technique, a material known as Biochar (BC) is produced, which has proven to have interesting physical-chemical properties for it to be used as an asphalt modifier, and simultaneously, helps to mitigate negative impacts on the environment. The foregoing article presents a bibliographical review on the use of BC as a modifier for asphalt binders and asphalt mixes. This has the purpose of becoming a starting point for future research efforts. In the reviewed literature, there was no review found on this topic. In general terms, BC increases the performance of asphalt binders in high-temperature climates, and tends to reduce its performance in low-temperature ones. Few studies have evaluated the performance of BC on asphalt mixes and the long-term properties associated with durability. Based on the reviewed literature, at the end of the article, recommendations are provided for future study topics.

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“…Pyrolysis has recently developed as a potential method for sewage sludge treatment to simultaneously reduce sludge volume, recover energy and immobilize heavy metals (Chen et al 2014;Deng et al 2020). Biochar, the main product of biomass pyrolysis, is generally alkaline carbon-rich material with porous structure, nutrient contents and abundant functional groups.…”

Section: Introductionmentioning

confidence: 99%

Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge

Zhao

Qiu

Fan

et al. 2021

Water Science and Technology

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The dewatered sewage sludge (DSS) and anaerobically digested sludge (ADS) were pyrolyzed at 550 °C to investigate the characteristics of derived biochar and evaluate the risk of heavy metals (Cr, Ni, Cu, As, Cd, and Pb). The results showed that the pH value of the biochar derived from DSS (DSS-C) was slightly lower than that of the biochar derived from ADS (ADS-C), while DSS-C presented relatively higher specific surface area and total pore volume. DSS-C also showed higher H/C and lower O/C ratios than ADS-C, indicating a higher aromatic condensation and a lower polarity. And the total concentrations of Cr, Ni, Cu, As, Cd, and Pb in DSS and ADS increased significantly after pyrolysis owing to the thermal decomposition of organic matter in the sludge, with corresponding rise of the Nemerow pollution index (NPI) of the biochars compared with the raw sludge. In addition, the sequential extraction procedure (BCR) analysis revealed that pyrolysis process promoted the transformation of heavy metals from bio-available fractions to stable fractions. The potential environmental risk of heavy metals decreased from moderate and extremely high level in the DSS and ADS to low risk and moderate level in DSS-C and ADS-C after pyrolysis, respectively.

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Application of sludge-based biochar generated by pyrolysis: A mini review

Cited by 9 publications

References 51 publications

Survey on Lombardy Region Wastewater Effluents and Application of Biochar from Biological Sewage Sludge for Wastewater Treatment

Survey on Lombardy Region Wastewater Effluents and Application of Biochar from Biological Sewage Sludge for Wastewater Treatment

Use of Biochar in Asphalts: Review

Chemical speciation and risk assessment of heavy metals in biochars derived from sewage sludge and anaerobically digested sludge

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