Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108576
Keywords
Sewage sludge; Sludge -based baking -free brick; Heavy metals; Organic matter; Risk assessment criteria
Categories
Funding
- Key Technology and Application of High Value Utilization on directional conversion of low calorific value coal ash slag in China [2020YFB0606205]
- Development and Application of Fly Ash based High Strength Polymer Prefabricated Parts and Thermal Insulation Materials in China [202102090301025]
- Key technology of cavernous material structure and function regulation in China [2019YFC0408604]
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This study produced sludge-based baking-free bricks (SBFB) using a mixture of sludge, fly ash, carbide slag, and desulfurization gypsum. By adjusting process parameters and curing conditions, the strength of SBFB was improved, and environmental risks were assessed, showing effective risk management strategies.
The high-water content and difficult dehydration of sewage sludge are the main factors restricting its disposal and application in China. In the paper, the sludge-based baking-free brick (SBFB) was made from sludge and fly ash -carbide slag -desulfurization gypsum with a certain amount of aggregate using compaction forming technology. The influence of process parameters (e.g., sludge content, aggregate content, molding pressure, curing method and curing temperature) on the properties of SBFB were investigated. Additionally, the envi-ronmental risk assessment of heavy metals and organic pollution of SBFB samples were carried out. The results indicated that when the sludge content was less than 30 %, the SBFB strength reaches 13.7 MPa under wet-heat cycle curing, which can meet the national standard of nonbearing wall for building bricks. According to the analysis of SEM and XRD, mullite and silicalite crystals were needle-like structures, which made the sludge particles closely linked with solid waste and compact structure. The appearance of these crystal structures was the internal driving force for the later strength of SBFB. Values of risk assessment criteria decreased through solidification treatment, in which Cd decreased to no risk, As, Pb, Zn decreased to low risk, Cu, Ni had moderate risk. All heavy metals were within China standards (GB5085.3-2007). Compared with sludge, the degradability of protein under curing conditions was greater than 77.35 % because of the decomposition of proteins in gel reaction system.
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