Journal
ENVIRONMENTAL TECHNOLOGY & INNOVATION
Volume 23, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.eti.2021.101574
Keywords
Concrete; Municipal sewage sludge incineration ash; Long-term; Environmental tolerance; Heavy metal
Funding
- Key R&D Program of Zhejiang Province, China [2020C03086]
- Basic public research Plan Projects of Zhejiang Province, China [LGF20E080004, LGC19E080001]
- National Undergraduate Training Program on Innovation and Entrepreneurship, China [201910353045, 202010353049]
- Xinmiao Rencai Project of Zhejiang Province [2020R408043]
- Zhejiang Gongshang University students innovation and entrepreneurship training program, China [CX201923001, CX201923012]
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The study assessed the long-term environmental performance of municipal sewage sludge incineration ash concrete, finding that the optimal formulation can increase unconfined compressive strength and release heavy metals within acceptable environmental ranges.
Municipal sewage sludge incineration ash (MSSIA) is commonly used as a raw material in concrete, but few studies have focused on the long-term environmental tolerance of municipal sewage sludge incineration ash concrete (MSSIAC). In this study, acid rain leaching, salt erosion, and freezing-thawing tests were used to evaluate the long-term environmental behavior of the optimal MSSIAC formulation. One optimal MSSIAC formulation replaces 5% MSSIA, and results in a 7.2% increase in unconfined compressive strength (UCS), indicating that MSSIA-amended concrete can have enhanced UCS. Only Zn was released from the optimal MSSIAC formulations (replacing 5% or 10% MSSIA) in the acid rain leaching test, but only up to 0.071 mg Zn L-1, which was within the acceptable environmental range. No heavy metals were released at concentrations above the method detection limits in the salt erosion and freezing-thawing tests. The optimal MSSIAC formulations have excellent long-term environmental tolerance while meeting the requirement of UCS, and provide a valuable use for MSSIA. (C) 2021 Elsevier B.V. All rights reserved.
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