多孔生物质混凝土的制备及其对水环境影响的模拟试验  

Preparation of Porous Biomass Concrete and Simulated Experiment on Its Effects on Water Environment

作　　者：徐大勇[1] 蔡昌凤[1] 徐建平[1] 廖斌[2] 刘小磊[1] 王强[1] 

机构地区：[1]安徽工程大学生物与化学工程学院,安徽芜湖241000 [2]安徽工程大学建筑工程学院,安徽芜湖241000

出　　处：《生态与农村环境学报》2013年第5期646-649,共4页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(51274001);芜湖市科技计划(2012cxy13);中国矿业大学煤炭资源与安全开采国家重点实验室开放基金(SKLCRSM10KFA05)

摘　　要：制备了木屑多孔生物质混凝土(PBC),并通过清水浸泡和浸泡液的种子发芽试验,考察PBC浸泡后孔隙率变化及其浸泡过程对水环境的影响。结果表明,以最大抗压强度和孔隙率为指标,PBC较佳配合比分别为水灰比〔m(水)∶m(水泥)〕、水泥用量w和木屑添加量w为0.55、15%、1.0%和0.60、5%、2.5%两组。PBC浸泡液的ρ(COD)、pH值和电导率(EC)在短时间内快速上升,浸泡40 d内的平均值分别为76.4 mg·L-1、9.93和4.4 mS·cm-1;同条件下普通多孔混凝土(PC)浸泡液的ρ(COD)平均仅为9.9 mg·L-1,但其pH值和EC高于PBC。PBC和PC浸泡后孔隙率分别下降3.2和4.8百分点。种子发芽试验表明,PBC浸泡液对青菜种子发芽率无明显阻碍。分析认为,PBC能为水中微生物提供有效碳源,有利于降低水体pH值和EC,同时能有效减缓多孔混凝土的堵塞。In an experiment,several pieces of porous biomass concrete （PBC） were prepared out of sawdust and soaked in clean water separately and use the water separately to soak seeds for germination test.Results show that in terms of compressive strength and porosity,the optimum formular of the PBC was 0.55 in water-cement ratio,15％ cement and 1.0％ sawdust or 0.60 in water-cement ratio,5％ cement and 2.5％ sawdust.Once the PBC was put into water,COD,pH and EC of the water rose quickly in a short time and reached 76.4 mg · L-1,9.93 and 4.4 mS · cm-1,respectively,on average after 40 days of immersion.Under the same condition,COD content of the PC （ordinary porous concrete） soaking water was 9.9 mg · L-1,or only 13.0％ of PBC＇s,but pH and EC of the water was higher than that of the PBC＇s.The immersion test shows that both the PBC and the PC decreased in porosity by 3.2,and 4.8 percentage points,respectively.And the germination test shows that the PBC did not affect much seed germination of vegetables.The findings suggest that PBC is an effective carbon source to microbes in water and can reduce pH and EC of the water and slow down the process of clogging pores of the concrete.

关 键 词：多孔生物质混凝土(PBC) 配合比 木屑 浸泡 种子发芽试验 

分 类 号：X52[环境科学与工程—环境工程]