分光光度法测定含氰废水中的微量氨

采用HgCl2为掩蔽剂,建立了以Nessler试剂为显色剂、用可见光分光光度计测定含氰废水中微量氨的方法。在工作波长λmax=370nm处测定,线性范围为0.2～2mg/L,线性相关系数为0.9968,检测线为0.084mg/L,摩尔吸光系数为6074.3L/(mol·cm).此法操作简单,快速灵敏,具有良好的重现性和回收率。     

硫酸生产中余热回收与节能

硫酸生产中余热回收利用及节能措施是衡量硫酸生产现代化水平的一个重要标志。余热回收利用的好，可降低生产成本，提高产品市场竞争力。介绍了硫酸生产过程中合理回收利用余热的方法及节能降耗的措施。     

由废旧锌锰电池回收氯化锰和锌的一种工艺

介绍一种从废旧锌锰电池中回收锰、锌，进而生产工业级无水氯化锰、锌锭的工艺。该工艺所制得的产品符合有关企业标准，总回收率分别达到93％和95％。充分研究了产品除铁方法，并对镉、铅、汞重金属进行了无害处理。     

微电解—微生物法组合工艺处理含铬电镀废水

针对单一生物法净化含铬电镀废水存在着效率低、处理成本高的问题，采用一种新的组合工艺—微电解—生物法来处理含铬电镀废水．在实验过程中，重金属离子通过微电解法去除90％以上，剩余部分被后续工艺的微生物功能菌去除．实验结果表明：Cr^6 含量为50mg／L，Cu^2 含量为15mg／L，Ni^2 含量为10mg／L的废水经处理后，重金属离子的净化率达99．9％，且无二次污染．     

道路标线涂料的正交试验研究

以苯乙烯为反应性溶剂，废旧聚苯乙烯泡沫塑料、不饱和聚酯树脂为主要原料制备道路标线涂料，通过正交试验确定了涂料的最佳配比。制备的道路标线涂料具有施工方便、涂膜厚度适当、附着力强、气候适应性强等特点。并通过电镜分析对涂膜的微观结构进行了初步探讨。     

餐饮废油制生物柴油的排放特性

研究利用餐饮业废油脂制造生物柴油的方法.通过对比实验,研究增压柴油机燃烧餐饮废油制生物柴油和普通柴油对发动机动力性、经济性和排放特性的影响.研究结果表明:对于实验发动机,在油泵最大喷油量保持不变时,直接燃烧餐饮废油制生物柴油对柴油机动力性的影响小于2.5%;无论在全负荷还是部分负荷工况下,燃用餐饮废油均能大幅度降低柴油机的排气烟度、PT、CO和HC排放量,但是会引起NOx的排放量上升.     

浸没式MBR处理洗浴废水

以规模3 m^3/d浸没式MBR中试设备进行了洗浴废水处理效果的实验研究.原水COD为53.5～341.0 mg/L, NH4-N为7.2～39.1 mg/L,LAS为1.2～5.8 mg/L,浊度为13～152 ntu;经膜生物反应器的处理后出水COD为8.2～23.5 mg/L,去除率为90.9%, NH4-N为0.2～13.5 mg/L,去除率为71.0%,LAS为0～0.2 mg/L,去除率在90%以上, 浊度为1～7 ntu,去除率92%.说明膜生物反应器处理洗浴废水能够取得良好的效果,尤其是进水有机物质量浓度变化较大的情况下,仍然保持好的去除效果.     

微波法处理高浓度有机废水可行性实验

通过改变微波功率、进水流量和做空白实验、稳定实验等实验方法验证了微波法处理高浓度有机废水的可行性及可靠性.实验研究结果表明,利用微波的加热特性,对高浓度有机废水的处理有明显的效果,但能耗的因素不可忽略,其成本也比较高,工艺条件还应该作进一步的改善,但该技术在环境保护领域具有广泛的应用前景.     

New Bio-Based Furanic Materials Effectively Absorb Metals from Water and Exert Antimicrobial Activity

Development of sustainable bio-based materials for removal of toxic contaminants from water is a high priority goal. Novel bio-based binary and ternary copolymers with enhanced ion-exchange, adsorption and antibacterial properties were obtained by using plant biomass-derived diallyl esters of furandicarboxylic acid (FDCA) as crosslinking agents and easily available vinyl monomers. The synthesized copolymer materials showed higher sorption capacities for Ni^II, Co^II and Cu^II compared to the commercial ion-exchange resins, and they maintained their high metal adsorption capacities for over 10 cycles of regeneration. The synthesized copolymer gels containing 1–5 wt % of the crosslinker showed excellent water absorption capacities. The synthesized copolymers with 1 % crosslinker content showed swelling ratios high enough to also act as moisture absorbents. Synthesized copolymers with crosslinker content of 10 wt % performed as contact-active antibacterials by inhibiting the growth of Gram-positive (S. aureus) and Gram-negative bacteria (E. coli, K. pneumonia) in suspension tests.     

Evaluation of Formaldehyde in Foundry Waste Sands Using Liquid Chromatography

Abstract

The industrial manufacturing of metallic objects results in a high level of foundry waste sands that may contain toxic compounds such as formaldehyde. The formaldehyde content of foundry waste sands was evaluated by liquid chromatography. Samples were collected during various steps of the industrial processes. Results showed that the phenolic alkaline process generated waste sands with higher formaldehyde content than the furanic process; the highest value was 7.6 × 10^?3% (w/w). In this work, formaldehyde content decreased with time in all of the samples studied, revealing that most formaldehyde was released to the occupational environment.