印染RO浓水深度处理及回用

采用Fenton-石灰苏打法耦合工艺对某印染厂印染反渗透(RO)浓水进行深度处理。通过实验研究了不同H2O2和Fe2+投加量、pH和反应时间对废水COD去除率的影响,以及不同石灰和碳酸钠投加量对废水硬度的脱除效果,出水回用于染色工段进行染色实验。结果表明,在pH=3.0,Fe2+投加量为1.5 mmol/L,H2O2投加量为3.75 mmol/L,反应时间为45 min,石灰和碳酸钠投加量分别为450 mg/L和1 000 mg/L的条件下,出水COD和硬度的去除率可分别达到73.9%和85.0%,耦合工艺出水水质符合该厂回用染色水标准,且减少了盐的使用,可实现印染RO浓水回用。     

干燥过程中的噪声危害及防治措施

粮食烘干过程的噪声危害必须引起人们的重视，通过对噪声产生的根源及给作业人员健康带来的损害进行分析，结合生产实际，提出了防治措施。     

认真落实个体防护措施的相关法律规定

个体防护措施包括个体防护用品、用具、装备、材料和制度等.任何职业人群都存在个体防护问题,只是不同的人群受危害的程度不同.因此,我国相关的法律规定了个体防护的内容,强调了个体防护的重要性,从而体现了国家对职业人群的关怀.主要有:     

生化需氧量(BOD_5)测定接种菌剂的研究

利用从市政污水中筛选的3株菌株制备成BOD5接种冻干粉剂,用于BOD5接种。实验确定了冻干粉接种菌剂最佳制备条件。以葡萄糖和谷氨酸配制的标准溶液(GGA)和实际废水为实验对象,完成了制得菌剂与传统接种液(土壤浸出液)及国外商业菌种Polyseed的性能对照。用接种菌剂接种测定GGA的测定结果均在180~230 mg/L,满足标准要求,接种菌剂、土壤浸出液和Polyseed的标准偏差分别为3.60、8.34、2.87 mg/L,测定实际废水的标准偏差分别为8.5、33.26、.0 mg/L。     

人工湿地在污水处理中的应用及展望

本文综述了人工湿地去除有机物、氮、磷和重金属的影响因素,同时对人工湿地处理污水的前景进行了展望．     

小城镇建设项目环境影响评价相关问题探讨——以聊城经济开发区蒋官屯小城镇建设项目为例

在中国的城市化进程中,小城镇建设发挥了重要的作用,引起了各级政府的重视。本文以聊城经济开发区蒋官屯小城镇建设项目为例,结合小城镇建设项目的特点,就小城镇建设项目的环境影响评价中相关问题进行了探讨,主要从环境影响评价的特点、评价的主要内容、评价重点、项目建设对环境的影响分析及外环境对项目的影响分析、生态及社会环境影响分析、公众参与、项目选址合理性分析、应特别关注的环境问题等几个方面进行阐述,以期为小城镇建设项目环境影响评价提供参考。     

山海关海岸带盐生种子植物调查及生态应用探讨

对山海关滨海盐生植物及盐生植被景观和群落配置情况进行实地调查并参考历史文献,发现山海关滨海湿地共有盐生种子植物26科44属51种。结合山海关海岸带的气候、土壤理化性质及土地覆盖和利用的现状,选择乔、灌木类盐生植物3种,藤本类盐生植物1种,中生草本盐生植物5种,旱生草本盐生植物2种,湿生植物4种,共计15种作为滨海地区盐碱地改良和植被恢复的野生植物种类。     

液氯泄露环境风险评价

文章以如东易昌化工有限公司为例,按照《建设项目环境风险评价导则》的要求,在对液氯的理化性质及危险性识别的基础上,分别进行了风险识别、伴生/次生危险性分析、源项分析等工作,确定了此次风险评价采用的相关标准,采用导则推荐的多烟团模式进行了事故发生后液氯泄露的环境风险预测和评价,得出了不利气象条件下的事故风险影响范围,求得了最大风险值,并从氯气瓶库及供氯站设置、生产过程等方面提出了相关的风险管理措施。     

Efficient treatment of azo dye containing wastewater in a hybrid acidogenic bioreactor stimulated by biocatalyzed electrolysis

In this study, a novel scaled-up hybrid acidogenic bioreactor(HAB) was designed and adopted to evaluate the performance of azo dye(acid red G, ARG) containing wastewater treatment. Principally, HAB is an acidogenic bioreactor coupled with a biocatalyzed electrolysis module. The effects of hydraulic retention time(HRT) and ARG loading rate on the performance of HAB were investigated. In addition, the influent was switched from synthetic wastewater to domestic wastewater to examine the key parameters for the application of HAB. The results showed that the introduction of the biocatalyzed electrolysis module could enhance anoxic decolorization and COD(chemical oxygen demand) removal. The combined process of HAB-CASS presented superior performance compared to a control system without biocatalyzed electrolysis(AB-CASS). When the influent was switched to domestic wastewater, with an environment having more balanced nutrients and diverse organic matters, the ARG, COD and nitrogen removal efficiencies of HAB-CASS were further improved, reaching 73.3% ± 2.5%, 86.2% ± 3.8% and 93.5% ± 1.6% at HRT of 6 hr, respectively, which were much higher than those of AB-CASS(61.1% ± 4.7%,75.4% ± 5.0% and 82.1% ± 2.1%, respectively). Moreover, larger TCV/TV(total cathode volume/total volume) for HAB led to higher current and ARG removal. The ARG removal efficiency and current at TCV/TV of 0.15 were 39.2% ± 3.7% and 28.30 ± 1.48 m A,respectively. They were significantly increased to 62.1% ± 2.0% and 34.55 ± 0.83 m A at TCV/TV of 0.25. These results show that HAB system could be used to effectively treat real wastewater.     

Arsenic redox transformation by Pseudomonas sp. HN-2 isolated from arsenic-contaminated soil in Hunan, China

A mesophilic,Gram-negative,arsenite[As(Ⅲ)]-oxidizing and arsenate[As(V)]-reducing bacterial strain,Pseudomonas sp.HN-2,was isolated from an As-contaminated soil.Phylogenetic analysis based on 16 S r RNA gene sequencing indicated that the strain was closely related to Pseudomonas stutzeri.Under aerobic conditions,this strain oxidized 92.0%(61.4 μmol/L) of arsenite to arsenate within 3 hr of incubation.Reduction of As(V) to As(Ⅲ) occurred in anoxic conditions.Pseudomonas sp.HN-2 is among the first soil bacteria shown to be capable of both aerobic As(Ⅲ) oxidation and anoxic As(V) reduction.The strain,as an efficient As(Ⅲ) oxidizer and As(V) reducer in Pseudomonas,has the potential to impact arsenic mobility in both anoxic and aerobic environments,and has potential application in As remediation processes.