首页|Biotreatment of incinerated bottom ash and biocementation of sand blocks using soybean urease

Biotreatment of incinerated bottom ash and biocementation of sand blocks using soybean urease

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Because of the high cost of cultivating urease-producing bacteria(UPB),this paper proposes soybean-urease-induced carbonate precipitation(SUICP)as a novel biocement for treatment of nickel contaminants and cementation of sandy soil.We found the optimal soaking time and soybean-powder content to be 30 min and 130 g/L,respectively,based on a standard of 5 U of urease activity.The most efficient removal of nickel ions is obtained with an ideal mass ratio of urea to nickel ions to soybean-powder filtrate(SPF)of 1׃2.4׃20.The removal efficiency of nickel ions can reach 89.42%when treating 1 L of nickel-ion solution(1200 mg/L with the optimal mass ratio).In incinerated bottom ash(IBA),the removal efficiency of nickel ions is 99.33%with the optimal mass ratio.In biocemented sandy soil,the average unconfined compressive strength(UCS)of sand blocks cemented with soybean urease-based biocement can reach 118.89 kPa when the cementation level is 3.Currently,the average content of CaCO3 in sand blocks is 2.52%.As a result,the SUICP process can be applied to remove heavy metal ions in wastewater or solid waste and improve the mechanical properties of soft soil foundations.

BiocementSoybean-powder filtrate(SPF)Removal efficiencySandy soilUnconfined compressive strength(UCS)

Xiaoniu YU、Yidong XU

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Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing 211189,China

School of Civil Engineering and Architecture,NingboTech University,Ningbo 315100,China

Opening Funds of Jiangsu Key Laboratory of Construction MaterialsKey Project of Natural Science Foundation of Zhejiang Province,ChinaGeneral Project of Natural Science Foundation of Zhejiang Province,China

CM2018-02LZ22E080003LY20E080002

2024

10.1631/jzus.A2300006

浙江大学学报(英文版)(A辑:应用物理和工程)
浙江大学

浙江大学学报(英文版)(A辑:应用物理和工程)

CSTPCD
影响因子：0.556
ISSN：1673-565X
年,卷(期)：2024.25(1)
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