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

作　　者：Xiaoniu YU Yidong XU 

机构地区：[1]Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing,211189,China [2]School of Civil Engineering and Architecture,NingboTech University,Ningbo,315100,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第1期36-46,共11页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the Opening Funds of Jiangsu Key Laboratory of Construction Materials(No.CM2018-02);the Key Project of Natural Science Foundation of Zhejiang Province,China(No.LZ22E080003);the General Project of Natural Science Foundation of Zhejiang Province,China(No.LY20E080002).

摘　　要：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 CaCO_(3)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.

关 键 词：Biocement Soybean-powder filtrate(SPF) Removal efficiency Sandy soil Unconfined compressive strength(UCS) 

分 类 号：X705[环境科学与工程—环境工程] TU472[建筑科学—结构工程]