A~2/O＋硫磺填料柱组合工艺脱氮除磷的效果

以某城市污水厂进水为研究对象,采用A2/O＋硫磺填料反应柱组合工艺,考察其对COD、总氮、总磷以及溶解性磷处理效果的改善。组合工艺出水水质稳定后,连续运行55 d,并对工艺的出水进行常规指标分析。结果表明：组合工艺的脱氮除磷效果较单个A2/O工艺都得到了较大的改善,而COD去除效果变化不大。A2/O系统对COD有良好的去除效果,出水的COD平均去除率能达到94%;TN和TP去除效果相对较差,出水平均去除率分别为60%和57.4%。经硫磺填料反应柱的脱氮除磷作用,系统出水TN去除率提高到84%,TP去除率提高到69.8%,COD去除率变化不大,升高到95.3%。     

一体式膜生物反应器处理生活污水的中试研究

采用中试规模(1.8 m3/d)的缺氧-好氧膜生物反应器(A/O MBR)对城市污水处理回用进行了试验研究.试验结果表明,该工艺处理效果优良,系统对COD、氨氮、浊度、总氮、总磷去除率较高,COD、氨氮出水浓度分别为7～39 mg/L、0～1.31 mg/L.出水水质优于城市杂用水水质标准(GB/T18920-2002).     

Temporal variation and sharing of antibiotic resistance genes between water and wild fish gut in a peri-urban river

Antibiotic resistance genes (ARGs) as emergence contaminations have spread widely in the water environment. Wild fish may be recipients and communicators of ARGs in the water environment, however, the distribution and transmission of ARGs in the wild fish and relevant water environment were rarely reported. Here, we have profiled ARGs and bacterial communities in wild freshwater fish and relevant water in a peri-urban river using high-throughput qPCR and 16S rRNA gene sequence. A total of 80 and 220 unique ARG subtypes were identified in fish and water samples. Fish and water both showed significant ARG seasonal variations (P < 0.05). The highest absolute abundance of ARGs in fish and water occurred in summer (1.32 × 10⁹ copies per g, on average) and autumn (9.04 × 10⁶ copies per mL), respectively. In addition, the bipartite network analysis showed that 9 ARGs and 1 mobile genetic element continuously shared in fish and water. Furthermore, bacteria shared in fish and water were found to significantly correlate with shard ARGs. The findings demonstrate that bacteria and ARGs in fish and water could interconnect and ARGs might transfer between fish and water using bacteria as a spreading medium.     

聚糖菌快速富集方法的建立及群落特性分析

为研究聚糖菌(GAOs)模型的群落结构及糖原相关功能基因的表达变化,通过厌氧末排水及磷限制条件的双重策略,建立快速、稳定的聚糖菌模型.应用宏基因组学技术测定了 GAOs体系菌群结构的动态变化,并分析在驯化过程中糖原代谢通路关键功能基因的调节作用.结果表明,经过40d左右的驯化,反应器呈现出典型的GAOs代谢模式,厌氧利...     

沿面放电活化空气用于亚硫酸铵氧化

在主流湿法烟气脱硫工艺中,采用强制氧化法对亚硫酸盐产物进行氧化,该方法存在亚盐氧化速率低、耗能高、设备投资大等问题。本研究采用沿面放电等离子体将空气预活化为富含活性氧的氧化气体,替代空气以提高亚硫酸盐的氧化效率。以亚硫酸铵浆液为对象,考察了沿面放电等离子体装置中空气流速、放电电压等活性物质发生因素,以及浆液pH值、浆液温度和硫酸铵含量等浆液条件对亚硫酸铵氧化的影响,发现亚硫酸盐氧化率随空气流速增大、放电电压升高而升高,pH值、浆液温度对亚硫酸铵氧化的影响不大,浆液中硫酸铵的存在不影响活性氧注入提高空气强制氧化亚硫酸铵效果的性能。同空气强制氧化相比,采用沿面放电预活化的空气氧化,可有效缩短亚硫酸铵的氧化时间。沿面放电活性氧注入是一种快速高效的亚硫酸盐氧化方法,具有较高的工业应用价值。     

新型固定化硝化菌活性填料硝化活性的影响因素

以新型固定化硝化菌活性填料为研究对象,以游离态硝化菌为参照,分别考察了各个环境因素对固定化硝化菌硝化活性的影响,确定了最佳操作点为温度30 ℃,pH 8.0~9.0,DO 4.0 mg/L。与游离态硝化菌相比较,硝化菌固定化后并没有改变其对温度的敏感程度;固定化硝化菌可在偏碱性环境下保持较高的硝化活性;DO对固定化硝化菌的硝化活性有较大影响,需要较高的DO值来保持较高的硝化速率。为考察固定化硝化菌活性填料连续处理氨氮废水的效果,采用最佳操作点进行了连续运行实验,实验共进行60 d。结果表明,新型固定化硝化菌活性填料抗冲击负荷能力强,硝化性能高效稳定,实验条件下最高硝化速率可达到86.45 mg/(L·h)。     

Transient species in the ozonolysis of tetramethylethene

The reaction of alkenes with ozone has great effect on atmospheric oxidation,its transient species can produce OH radicals and contribute to the formation of secondary organic aerosols(SOA).In the present study,the reaction of tetramethylethene(TME) with ozone was investigated using self-assembled low temperature matrix isolation system.The TME and ozone were co-deposited on a salt plate at 15 K,and then slowly warmed up the plate.The first transient species primary ozonide(POZ) was detected,ind...     

Enhanced adsorption properties of organic ZnCr-LDH synthesized by soft template method for anionic dyes

Environmental Science and Pollution Research - Organic ZnCr-LDH (ST-LDH) was synthesized by a facile one-step hydrothermal technique using methyl orange (MO) as a soft template agent, which can...     

Satellite-based decadal change assessments of pan-Arctic environments

Remote sensing can advance the work of the Circumpolar Biodiversity Monitoring Program through monitoring of satellite-derived terrestrial and marine physical and ecological variables. Standardized data facilitate an unbiased comparison across variables and environments. Using MODIS standard products of land surface temperature, percent snow covered area, NDVI, EVI, phenology, burned area, marine chlorophyll, CDOM, sea surface temperature, and marine primary productivity, significant trends were observed in almost all variables between 2000 and 2017. Analysis of seasonal data revealed significant breakpoints in temporal trends. Within the terrestrial environment, data showed significant increasing trends in land surface temperature and NDVI. In the marine environment, significant increasing trends were detected in primary productivity. Significantly earlier onset of green up date was observed in bioclimate subzones C&E and longer end of growing season in B&E. Terrestrial and marine parameters showed similar rates of change with unidirectional change in terrestrial and significant directional and magnitude shifts in marine.     

控制星湖内源性营养物质磷负荷的有效性研究

本文研究了天然沸石与石灰,铝盐,铁盐对湖水－沉积物系统中的湖水脱磷的可能性,以期在对星湖内源性营养物质磷负荷的控制方面提供科学依据。