化学沉淀法去除焦化废水中的氨氮

采用化学沉淀剂MgCl2 ·6H2 O和Na2 HPO4·12H2 O(或MgHPO4·3H2 O)与焦化废水中的NH+ 4 反应 ,生成磷酸铵镁沉淀。探讨了不同操作条件对氨氮去除率的影响。在pH为 8 5～ 9 5的条件下 ,投加的药剂Mg2 + ∶NH+ 4 ∶PO3 -4(摩尔比 )为 1 4∶1∶0 8时 ,废水氨氮的去除率达 99%以上 ,出水氨氮的质量浓度由 2 0 0 0mg/L降至 15mg/L。     

NKA—Ⅱ大孔吸附树脂吸附高浓度苯胺溶液的试验研究

本文利用ＮＫＡ－Ⅱ大孔吸附树脂对高浓度苯胺溶液进行了静态吸附试验,希望利用大孔吸附树脂从化工废水中回收苯胺。     

天津经济技术开发区(TEDA)社会发展预警系统建立的研究

本文根据社会发展的统计指标体系,结合评价可持续发展的社会指标体系构成,得出社会发展警情、警兆指标体系,然后根据统计数据,采用实证和理论分析相结合的方法,给出社会发展警情预报的警情警限值,并利用其研究ＴＥＤＡ的社会发展态势,最终给出ＴＥＤＡ警源形成因素及排警对策。     

Insight of chemical environmental risk and its management from the vinyl chloride accident

The combustion of vinyl chloride (VC) after the train derailment accident in Ohio, USA in February, 2023 has caused widespread concern around the world. This paper tried to analyze several issues concerning the accident, including the appropriateness of the VC combustion in the emergency response in this accident, the meanings of so-called “controlled combustion”, the potential environmental risks caused by VC and combustion by-products, and follow-up work. In our view, this accident had surely caused environmental and health risks to some extent. Hence, a comprehensive environmental risk assessment is necessary, and then the site with risk should be comprehensively remediated, hazardous waste should be harmlessly treated as soon as possible. Finally, this accident suggests that further efforts should be taken to bridge the gap between chemical safety management and their environmental risk management.     

河鲈锚首吸虫及其宿主鳜鱼组织器官中铅含量的比较

利用原子吸收分光光度计分析了寄生鳜鱼（Sinipercachuatsi）鳃部的河鲈锚首吸虫（Ancyrocephalusmogurndae）及其宿主组织器官,包括肌肉、鳃、头肾和肝脏的铅含量.结果表明,来自三湖连江水库和牛山湖两个采样点的河鲈锚首吸虫的铅含量都显著地高于其宿主组织器官中的铅含量.在所检测的宿主组织器官中,肝脏的铅含量最高,在两个采样点分别为0.138和0.114μg/g（湿重）.河鲈锚首吸虫富集铅的机理及其较高水平铅含量的特点是否与其体外寄生的特性有关,尚有待于进一步研究.     

Tetracycline removal via adsorption and metal-free catalysis with 3D macroscopic N-doped porous carbon nanosheets: Non-radical mechanism and degradation pathway

Recently, metal-based carbon materials have been verified to be an effective persulfate activator, but secondary pollution caused by metal leaching is inevitable. Hence, a green metalfree 3D macroscopic N-doped porous carbon nanosheets（NPCN） was synthesized successfully. The obtained NPCN showed high adsorption capacity of tetracycline（TC） and excellent persulfate（PS） activation ability, especially when calcined at 700 °C（NPCN-700）. The maximum adsorption capacity of NPCN-700 was 121.51 mg/g by ...     

湿式催化氧化技术处理高浓度工业废水研究

采用日本大阪煤气公司先进的湿式催化氧化技术及其 2 0 0 L/ d小型工业试验装置对高浓度焦化废水、造纸黑液 (原水CODCr分别为 1180 0和 5 0 0 0 0 mg/ L )进行处理试验 ,结果 CODCr去除速率分别达到 5 40 mg/ ( L· min)和 2 412 mg/ ( L· m in)。应用国产化湿式催化氧化技术和 2 0 m3/ d工业装置对同样两种高浓度工业废水进行处理 ,结果 CODCr和 NH3-N的去除率均达 99%以上 ,并使废水经处理后连续稳定地达标排放 ,具有较好的经济效益     

环境中全氟辛基磺酸的修复技术研究进展

主要研究了三大修复技术,物理法通过吸附、膜处理等技术将PFOS分离,化学法通过氧化、还原等方式改变PFOS的性质进而将其降解,生物法通过驯化优势菌群有效降解PFOS。上述方法各有优缺点,物理法简单经济,但会产生二次污染,化学法效果显著但条件苛刻,生物法效率高但自然降解能力低,而几种方法的耦合会大大提高降解效率,将成为水污染处理中去除PFOS的主要研究方向。     

Design and characterization of human exposure to generated sulfate and soot particles in a pilot chamber study

A number of literatures have documented adverse health effects of exposure to fine particulate matter (PM_2.5), and secondary sulfate aerosol and black carbon may contribute to health impacts of PM_2.5 exposure. We designed an exposure system to generate sulfate and traffic soot particles, and assessed the feasibility of using it for human exposure assessment in a pilot human exposure study. In the designed exposure system, average mass concentrations of generated sulfate and soot particles were 74.19μg/m³ and 11.54μg/m³ in the chamber and did not vary significantly during two-hour human exposure sessions. The size ranges of generated sulfate were largely between 20 to 200 nm, whereas those of generated soot particles were in the size ranges of 50 to 200nm. Following two-hour exposure to generated sulfate and soot particles, we observed significant increases in fractional exhaled NO (FeNO) in young and health subjects. Building on established human exposure system and health response follow-up methods, future full-scale studies focusing on the effects of mixed particulates and individual PM_2.5 components would provide data in understanding the underpinning cardio-respiratory outcomes in relation to air pollution mixture exposure.

Implications: Controlled exposure is a useful design to measure the biological responses repeatedly following particulate exposures of target components and set exposure at target levels of health concerns. Our study provides rational and establishes method for future full-scale studies to focus on examining the effects of mixed particulates and individual PM_2.5 components.