本文關(guān)鍵詞： 微生物水泥 方解石 微生物 礦化　出處：《硅酸鹽學(xué)報(bào)》2017年11期 　論文類型：期刊論文

【摘要】：分別從光密度(OD值)、p H值、Ca~(2+)濃度和無(wú)機(jī)碳含量(DIC)4個(gè)方面對(duì)環(huán)境中生物對(duì)微生物水泥礦化過(guò)程的影響機(jī)理展開研究。結(jié)果表明:雖然環(huán)境中的微生物能為CaCO_3晶體的沉積提供額外的成核位置,但其自身的生長(zhǎng)繁殖、呼吸作用會(huì)消耗大量的營(yíng)養(yǎng)物質(zhì),導(dǎo)致試樣中p H值和CO_3~(2-)濃度的降低,不利于碳酸鈣沉積的析出,造成在工程應(yīng)用中需要生成大體量的CaCO_3時(shí),速率、效率明顯低于無(wú)環(huán)境中生物時(shí)的情形。因此,在微生物水泥技術(shù)實(shí)際應(yīng)用中,必須考慮環(huán)境中已有生物的影響。試樣中僅加入產(chǎn)脲酶菌就可以達(dá)到持續(xù)生成CaCO_3的目的,建議不加入營(yíng)養(yǎng)物質(zhì)以降低刺激環(huán)境中生物非礦化反應(yīng)的風(fēng)險(xiǎn)。
[Abstract]:The effects of the concentration of OD value and the content of inorganic carbon on the mineralization process of microbial cement in the environment were studied respectively. The results show that the microorganism in the environment can be CaCO_3 crystal, even though the microorganism in the environment is CaCO_3 crystal. The deposits provide additional nucleation sites, However, its own growth, reproduction and respiration will consume a large amount of nutrients, which will lead to the decrease of pH value and CO3T _ 2-concentration in the sample, which is not conducive to the precipitation of calcium carbonate deposition, resulting in the rate of producing a large amount of CaCO_3 in engineering applications. Therefore, in the practical application of microbial cement technology, the influence of existing organisms in the environment must be considered. Only adding urease producing bacteria to the sample can achieve the purpose of producing CaCO_3 continuously. It is recommended not to add nutrients in order to reduce the risk of stimulating bioremediation in the environment.
【作者單位】： 南京林業(yè)大學(xué)土木學(xué)院;江蘇省水土保持與生態(tài)修復(fù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51578293) 江蘇省高校自然科學(xué)研究面上項(xiàng)目(15KJB580008)
【分類號(hào)】：TQ172.1
，

本文編號(hào)：1551268