雨水资源与雨水资源的评价

本文论述了雨水资源和目前世界各地雨水利用的概况,提出了家庭用水和农业用水雨水资源评价的计算方法。     

炼油厂剩余活性污泥综合利用可行性分析

针对目前炼油企业在剩余活性污泥处置过程中存在费用高、负担重及资源浪费等问题,选择典型代表企业进行采样分析,结果表明:与目前常用处置技术对比,污泥热干化后回用于锅炉做辅助燃料是可行的,同时也是目前较佳的综合利用方式。     

常用玻璃量器衡量法K(t)值数学模型的建立与探讨

介绍常用玻璃量器的检定原理和方法,并详细叙述了修正系数K(t)的数学模型建立的全过程。全面分析了模型中所有参数的相关性,在此基础上对模型进行了优化,去除了模型中次要参数,大大简化了数学模型,同时,修正了JJG196-2006《常用玻璃量器检定规程》中忽略大气压力参数的影响,导致可能出现检定结论出错的问题,并给出了优化后的数学模型表达式,分别给出了大气压力在110～50KPa之间的钠钙玻璃和硼硅玻璃量器的K(t)值表。     

燃煤锅炉烟气中一氧化氮排放浓度测量的不确定度评定

根据《测量不确定度评定与表示》（JJF1059-1999）,对燃煤锅炉烟气中一氧化氮排放浓度的测量不确定度进行评定。对废气监测领域不确定度评定具有现实意义。     

油库油气回收效果测试方法

分析比较了油库油气回收系统效果检测方法的优缺点,以供油库单位在日常管理中,方便地检验油气回收系统的运行效果,及时发现存在的问题,确保油气回收系统的正常运行。     

Photocatalytic degradation of perfluorooctanoic acid with β-Ga2O3 in anoxic aqueous solution

Perfluorooctanoic acid (PFOA) is a new-found hazardous persistent organic pollutant, and it is resistant to decomposition by hydroxyl radical (HO·) due to its stable chemical structure and the high electronegativity of fluorine. Photocatalytic reduction of PFOA with β-Ga₂O₃ in anoxic aqueous solution was investigated for the first time, and the results showed that the photoinduced electron (e_cb^-) coming from the β-Ga₂O₃ conduction band was the major degradation substance for PFOA, and shorter-chain perfluorinated carboxylic acids (PFCAs, C_nF_2n+1COOH, 1 ≤ n ≤ 6) were the dominant products. Furthermore, the concentration of F^- was measured by the IC technique and defluorination efficiency was calculated. After 3 hr, the photocatalytic degradation efficiency was 98.8% and defluorination efficiency was 31.6% in the presence of thiosulfate and bubbling N₂. The degradation reaction followed first-order kinetics (k = 0.0239 min^-1, t_1/2 = 0.48 hr). PFCAs (C_nF_2n+1COOH, 1 ≤ n ≤ 7) were detected and measured by LC-MS and LC-MS/MS methods. It was deduced that the probable photocatalytic degradation mechanism involves e_cb^- attacking the carboxyl of C_nF_2n+1COOH, resulting in decarboxylation and the generation of C_nF_2n+1·. The produced C_nF_2n+1· reacted with H2O, forming C_nF_2n+1OH, then C_nF_2n+1OH underwent HF loss and hydrolysis to form C_nF_2n+1COOH.     

离子色谱在饮用水消毒副产物及高氯酸盐分析中的应用

介绍了离子色谱在饮用水中消毒副产物及高氯酸盐分析中的应用。重点介绍了离子色谱测定饮用水中溴酸盐和高氯酸盐的方法。简单介绍了卤代乙酸和氯酸盐的离子色谱测定法及离子色谱-质谱联用技术在饮用水消毒副产物及高氯酸盐分析中的应用。     

Double-Melting Behavior of Bamboo Fiber/Talc/Poly (Lactic Acid) Composites

The melting and crystallization behavior of pure poly (lactic acid) (PLA) and PLA composites (1% Bamboo Fiber (BF)/PLA, 1% Talc/PLA, 1% BF/1% Talc/PLA) were studied with differential scanning calorimetry (DSC). DSC curves for PLA composites were obtained at various cooling rates, the crystallization temperature and heat of crystallization of PLA composites decreased almost linearly with increasing of log (cooling rate). Moreover, BF has minor effect and talc has the great effect on the crystallization temperature in the PLA composites. With increasing of cooling rate, the main melting temperature of PLA composites decreased. In pure PLA and 1% BF/PLA, the double-melting behavior appeared in the heating curves after slow rate of cooling, and there was the opposite phenomenon of double-melting behavior in other two PLA composites. BF promotes forming the imperfect crystal in the PLA composites during heating process. With increasing of heating rate, the main melting temperature of PLA composites increased except the 1% BF/PLA. At various heating rates, the defects of BF structure promoted the melt-recrystallization and talc promoted forming the small crystals. At last, the recrystallization model was given.