非硫酸盐高浓度有机废水酸化的可生化性指标

利用表观B/C指标和理论B/C指标评价了厌氧酸化过程对蔗糖-蛋白胨人工废水可生化性的影响.结果显示对于COD为1 064～63 900 mg/L的废水,采用表观B/C评价指标,废水的可生化性降低了0%～96%;采用理论B/C指标,可生化性提高幅度为2%～21.6%.实验结果表明用理论B/C指标评价厌氧酸化过程对蔗糖-蛋白胨人工废水可生化性的影响较之表观B/C更为科学合理;同时说明对于非硫酸盐废水类型,理论B/C作为评价其酸化过程改变废水可生化性的指标同样适用;酸化出水的理论B/C随废水COD增加呈现下降的趋势,理论分析认为其与废水的酸化度(α)有关,酸化度越低,酸化出水的理论B/C越低.     

许营桥加固维修技术探讨

结合聊城市省道710线许营桥(K28+835)的加固维修工程,详细介绍了粘贴碳纤维布技术在旧桥加固中的应用以及利用丙乳修补混凝土表面缺陷的施工经验。     

云南某工业园区污水处理厂工艺设计

云南某工业园区污水处理厂设计规模1.0×104m^3/d,二级处理采用倒置AAO工艺,生化池与二沉池、硝化液回流、污泥回流、剩余污泥排放等合建,具有占地面积小、工程造价低、运行维护以及管理方便等特点,三级处理采用“转盘滤池+生物快渗+紫外线消毒工艺”,设计出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。     

成年大鼠脑组织蛋白聚糖的提取与分离

本文以成年大鼠脑组织为实验对象，应用层析、酶解及电泳技术对３种提取方法２种提取剂提取蛋白聚糖的效果进行分析比较。结果表明：①用４ｍｏｌ／Ｌ盐酸胍提取脑蛋白聚糖的量均显著高于用ＰＢＳ，其蛋白质与蛋白聚糖之比却均低于ＰＢＳ．②ＰＢＳ能提取脑组织中的可溶性蛋白聚糖，４ｍｏｌ／Ｌ盐酸胍既能提取脑组织中的可溶性蛋白聚糖也能提取难溶性蛋白聚糖。③脱脂处理能降低脑蛋白聚糖的提取率，④脑蛋白聚糖经ＰＢＳ提取后，再经４ｍｏｌ／Ｌ盐酸胍提取，沉淀物中其含量甚微。     

高压琼脂电泳测定绒毛组织酶的遗传表型

介绍高压琼脂平板电泳测定绒毛组织中酸性磷酸酶(ACP)和脂酶D(EsD)的遗传表型的方法,它能简便快速地区别绒毛组织的这两种酶的各遗传表型。实验表明,此法用于妊娠早期进行父权鉴定是可行的。     

THE ULTRASTRUCTURE OF TOXOPLASMA GONDII TACHYZOITES AND THE EFFECT OF USNIC ACID ON IT

ＴＨＥＵＬＴＲＡＳＴＲＵＣＴＵＲＥＯＦＴＯＸＯＰＬＡＳＭＡＧＯＮＤＩＩＴＡＣＨＹＺＯＩＴＥＳＡＮＤＴＨＥＥＦＦＥＣＴＯＦＵＳＮＩＣＡＣＩＤＯＮＩＴ（吴杰）（杨少毅）（程彦斌）ＷｕＪｉｅ；ＹａｎｇＳｈａｏｙｉ；ＣｈｅｎｇＹａｎｂｉｎ；（Ｄｅｐｔ．ｏｆｐ...     

生物三相流化床处理印染废水的工程工艺理论研究

研究以生物三相流化床作为工程化反应器处理印染废水的工程工艺理论及操作特性，分别测定流化床内的气相含率，液体循环速度及体积氧传质系数，讨论它们之间的关系，明确工程化操作的条件，并经半年多的实际运行检验了所建立理论的正确性，实现了节能、高效与稳定出水的目标。     

蓄电池爬酸现象的预防及维护

介绍汽车起动用蓄电池爬酸的现象和形成机理，从使用角度分析爬酸形成原因，并提出预防和维护措施。     

Should chemical tankers' tank cleaning waters be banned from discharging into the sea?

Entering of chemical substances into aquatic environment occurs either by involuntary accidents or discharging of chemical wastes resulting from tank washing operations of tankers carrying chemicals. MARPOL 73/78 Convention strict regulations on discharging of chemical residues left in their tanks to the sea, but permits the discharging of such residues provided certain conditions are met. In the present study; the period from 1996 to 2016 is examined and the number of new tankers participating in the chemical tanker fleet and the distribution of these tankers according to dwt tonnage is shown. The tanker fleet which consisted of 1.882 ships in 1966 reached 3.923 units in 2016. Accordingly, the volume of chemical merchandise carried by sea was 132 million tons in 1996, but it reached 287 million tons in 2016. According to the order books, it is understood that these figures will increase even more. The increase in the number of tankers and the growth of the capacities means that more chemical substances are transported at the same time and the tonnage of the chemical waste discharged to the sea is also on increase. Based on the scientific background which proves that chemicals cause biological accumulation and acute and chronic toxicity on aquatic life, and the results of chemical tanker development over the last 20 years that has been presented; It is necessary for maritime authorities to reconsider the legal arrangements for allowing chemical tankers to discharge chemical wastes from tank washing waters to the sea.     

Simultaneous determination of 12, 13-dihydroxyeuparin and glycyrrhizic acid in Yanyanfang mixture by high performance liquid chromatography

A reversed phase high performance liquid chromatography （HPLC） method was established for the simultaneous determination of 12, 13-dihydroxyeuparin and glycyrrhizic acid in Yanyanfang mixture. A Grace Apollo Cl8 column （250 mm × 4.6 mm, 5 μm） was used as the stationary phase and the mobile phase was composed of acetonitrile and aqueous phosphoric acid （0.2%, v/v）. Gradient elution was carried out at the flow rate of 1.0 mL/min and the column temperature was 30 ℃. An ultraviolet （UV） detector was used with a selected wavelength of 240 nm. Calibration curves were linear within the concentration range of 4.6-45.75 μg/mL for 12, 13-dihydroxyeuparin （r〉0.9999） and 106.9-1068.9μg/mL for glycyrrhizic acid （r〉0.9999）, respectively. Recoveries were 102.18% for 12, 13-dihydroxyeuparin and 101.17% for glycyrrhizic acid. The method developed could be applied to the simultaneous determination of 12, 13- dihydroxyeuparin and glycyrrhizic acid in Yanyanfang mixture.