Study on the flocculability of metal ions by<Emphasis Type="Italic">Bacillus mucilaginosus</Emphasis> GY03 strain

This study deals with the flocculability of two types of metal ions by Bacillus macilaginosus GY03 Strain, with an emphasis on the influence of pH conditions, volume and time of flocculants produced by GY03 Strain on the adsorption of metal irons such as Pb^2 and Mn^2 and the capabilities of floceulants to adsorb metal ions of different concentrations. The results showed that microbial flocculants produced by Bacillus mucilaginosus GY03 Strain are highly capable of flocculating metal ions, but show different effectiveness with respect to the adsorption of Pb^2 and Mn^2 . In accordance with the experimental data and actual waste-water treatment conditions, the relevant regression equation of floeculation has been deduced, which has found some application in practice. The experimental results of this study demonstrated that microbial flocculants produced by Bacillus mucilaginosus can be used to treat metallic ion-containing waste water. In practical application the volume of microbial floceulants required and flocculation conditions should be taken into comprehensive consideration in accordance with the properties of metal ions, the composition of anions and the solubility of other metals, in combination with the cost and effectiveness of floceulants to be used. Floeeulant used in this experiment has the advantages of being applied over a wide range of pH values, small flocculant volume, and rapid speed of floeeulation. So this kind of flocculant is within excellent prospect of application.     

低剂量水泥稳定粒料基本性能

我国长久以来使用的半刚性基层发展到今天已广泛采用水泥稳定粒料基层,低剂量水泥稳定粒料基层与此类似但减少了水泥用量,从经济上和防止反射裂缝两个方面改善了水泥稳定粒料基层的性能。首先从级配角度出发,分析了级配对水泥稳定粒料强度的影响,规定了各级级配的控制点。然后从水泥稳定粒料基层强度与水泥用量的关系出发,按相同的集料级配,针对不同的水泥用量绘制了其最大干密度和含水量的关系曲线。最后按抗压强度和CBR值对比了不同水泥剂量间及与级配碎石的强度变化情况,验证了低剂量水泥稳定碎石基层应用的可能性。     

平果铝土矿洗矿泥沉降试验研究

用多种无机凝聚剂和聚丙烯酰胺系列絮凝剂对平果铝土矿洗矿泥进行沉降试验。结果表明，阴离子型和非离子型聚丙烯酰胺适用于平果铝土矿洗矿泥的絮凝沉降。推荐使用分子量为６００～９００万的阴离子型或非离子型聚丙烯酰胺作絮凝剂。     

废泥浆脱水的试验研究

岩土工程施工产生的废泥浆含水量高,脱水性差,因此如何提高废泥浆的脱水量至关重要。试验中通过对废泥浆的物理化学调质,以改变废泥浆颗粒表面物化性质和组分,破坏废泥浆的胶体结构,减小与水的亲和力,从而改善废泥浆的脱水性能。对不同种类的无机材料和有机高分子絮凝材料的试验分析发现,有机高分子聚丙烯酰胺PAM的絮凝脱水效果要优于无机材料。在阳离子型PAM、阴离子型PAM、非离子型PAM三类材料对废泥浆的絮凝脱水效果中,阳离子型PAM的絮凝脱水效果最好。     

微生物絮凝剂投加方式对好氧颗粒污泥性能的影响

为提高好氧污泥颗粒化速度, 采用微生物絮凝剂, 探讨在好氧颗粒污泥培养过程中微生物絮凝剂的投加方式对颗粒污泥理化性能及生物降解效能的影响。结果表明:微生物絮凝剂每隔2、3、5、7 d投加一次时, 均可培养出成熟的好氧颗粒污泥, 微生物絮凝剂的投加方式对好氧污泥颗粒化的影响较显著;微生物絮凝剂最佳投加方式为每5天投加一次, 此时颗粒化速度快, 颗粒形成时间由未投加的60 d缩短为42 d, 好氧颗粒污泥疏水性好, 污泥体积指数稳定在40 mL/g左右, 沉降速度达35.06 m/h, COD、氨氮和总磷的去除率分别为96.55%、93.29%和87.29%。     

密度计法试验土用量规定的讨论

通过对密度计法颗粒分析用土量的对比试验及各国有关标准的比较，可以认为国标的有关规定有待修改、完善。     

Study on the Flocculability of Metal Ions by Bacillus Mucilaginosus GY03 Strain

Inrecentyears,withtherapiddevelopmentofindustrialeconomy ,wastewaterisdischargedinhugevolumeandtheaccumulationofheavymetalionsinsoilsandwatersourcesisspeededuprapidly .Asaresult,waterpollutionhasbecomeadailydeterioratingproblem .Heavymetalsareeasytoenterthefoodchain ,therebyconstitutingagreatthreattothehealthofanimalsandhu manbeings .Therefore,howtoeffectivelyhandleheavymetalpollutionhasbecomeacommonat tractionformankind .Theroutineheavymetaltreatmentmethodsaremainlythechemical,phys icalandphy…     

甲壳胺对褐藻胶胶液的絮凝作用及其在漂浮工艺中的应用研究

研究了甲壳胺作为絮凝剂对褐藻胶胶液的絮凝作用及漂浮效果。结果表明,甲壳胺对褐藻胶胶液具有较强的絮凝作用,其中,１０ｐｐｍ甲壳胺用量的漂浮效果较好,可大大缩短漂浮时间,对清胶液的透光率,粘度和胶收率均有不同程度的提高。     

条形药包硐室爆破技术在山体危岩排险施工中的应用

危岩体硐室爆破一次排险量大,施工速度快,是大方量应急排险的首选爆破方案。本次巫山山体危岩硐室爆破排险,通过详细的地质调查和地形地貌测绘,采取信息化指导施工,安全、快速地完成了应急排险任务,一次排险28．7万m^3,历时46天,取得了较好的经济效益和社会效益。论述了本次爆破方案的设计、爆破参数的选择以及施工技术,介绍了爆破效果,总结了经验体会。     

Preparation of cationic chitosan-polyacrylamide flocculant and its properties in wastewater treatment

Chitosan derived from crab shells,was used to prepare the graft polymer in aqueous solution with acrylamide (AM) and methacrylatoethyl trimethyl ammonium chloride (DMC) as raw materials and ceric ammonium nitrate (CAN) as initiator.The floc-culation ability of the resulting polymer (PCAD) was studied in waste water treatment experiments.Its properties were determined on the basis of the transmittance of waste water after flocculation.The effects of chitosan and DMC content on PCAD’s flocculation ability wer...