活性炭纤维处理含多氯联苯废水的研究

对活性炭纤维吸附处理含多氯联苯废水进行了研究，确定了相关条件下的吸附容量，并实际应用于含多氯联苯废水的处理中。     

计算机控制四轨迹系列摆辗机研制

介绍了BY型计算机控制四轨迹摆辗机的设计特点、结构及制造、调试情况。     

Dissolved organic matter in pore water of freshwater sediments: effects of separation procedure on quantity, quality and functionality

Pore water was separated either with or without water extraction prior to centrifugation (7600 or 20 000 × g) in order to investigate the effects of separation procedure on the amount and properties of dissolved organic matter (DOM i.e. the material passing through a 0.45-μm filter) in three freshwater sediments. On the basis of solubility in alkaline, organic matter was concluded to compose of humic substances in two (S1 and S3) and of humin (S2) in one of the sediments. DOM in the samples was quantified by total organic carbon measurement. Specific UV-absorption (SUVA) and high performance size exclusion chromatography (HPSEC) analyses were used to characterize DOM. Sorption of pyrene was used as a measure for functionality of DOM. Both water extraction and centrifugation speed were shown to affect the properties of DOM; however, the effects were sediment dependent. Water extraction increased the amount of DOM separated from the two sediments that had humic character (S1 and S3). In most cases water extraction increased SUVA and shifted the molecular size distribution of DOM towards larger sizes. The separation procedure had also an effect on the functionality of DOM. In water extracted samples of S2 and S3 the sorption of pyrene was higher than in the corresponding samples separated without water extraction, whereas in S1 similar effect was not found. Generally, centrifugation speed had smaller effects on the properties of DOM than water extraction. The fact that the effects of separation procedure on DOM depend on the sediment characteristics complicates the comparison between samples and evaluation of functionality in field conditions.     

膜技术在水处理中的应用前景

介绍了膜分离技术的定义,种类,膜技术的应用领域及国内发展动态。     

Comparison of the droplet size spectra produced by rotary atomizers and hydraulic nozzles under simulated aerial application conditions

Abstract

A wind tunnel was used to characterize the droplet size spectra of liquid sprays from several different atomizers and nozzles used under simulated aerial application conditions. The atomizers included a D8–46 nozzle, a Through Valve Boom (TVB) nozzle, and rotary cage and drum atomizers.

The D8–46 hydraulic nozzle was evaluated, using water, at orientations of 0, 10, 20, 30, 40, 50, 60, 70, 80 and 90° relative to 145 and 180 km/h airstreams. The TVB nozzle was evaluated using water, water with isopropyl alcohol, and water with a non‐ionic surfactant at airstream velocities between 130 and 180 km/h. The rotary atomizers were evaluated at different rotation rates, flow rates of water and an insecticide, in 130 and 180 km/h airstreams.

The volumetric droplet size spectra parameters (D_vo.x) decreased as the angle of the D8–46 nozzle and the airstream velocity increased. Empirical models were developed to predict these values for different windspeed and nozzle angle conditions. The TVB nozzle produced larger droplets than the other atomizers under similar conditions, with a decrease in the D_vo.x parameter values as the airstream velocity increased.

The D_vo.x parameter values produced by the rotary atomizers increased as the liquid flow rate increased, and as the rotation rate and airstream velocity decreased, and were lower for the insecticide than for water. The slotted rotary drum atomizer gave the best control over droplet size, generally producing mono‐modal droplet size spectra where the other atomizers often produced bi‐ and multimodal spectra.     

工业污水回用是节约新鲜水的重要途径

介绍了二级出水深度处理工艺、药剂选择、试运行处理效果及深度处理后出水的回用情况。     

旋转接头在MBR反应器改良中的应用研究

随着MBR反应器在国内污水处理行业中的不断应用,其重要性进一步得到了业界的认可。但是,如何消减运行过程中的膜污染问题,成为制约MBR推广和应用的重要因素。文章通过实验,将旋转接头应用在MBR反应器的改良中,重点研究通过旋转接头实现膜组件的旋转运行模式对膜污染的抑制效果。     

Removal of virus aerosols by the combination of filtration and UV-C irradiation

● The removal of virus aerosols by filtration and UV-C irradiation was proposed. ● The filtration efficiency for virus aerosols was affected by the filtration rate. ● The inactivation rate by UV-C was not linear with irradiation intensity or time. ● The virus trapped by filter material had a shielding effect on UV-C irradiation. The COVID-19 pandemic remains ever prevalent and afflicting—partially because one of its transmission pathways is aerosol. With the widely used central air conditioning systems worldwide, indoor virus aerosols can rapidly migrate, thus resulting in rapid infection transmission. It is therefore important to install microbial aerosol treatment units in the air conditioning systems, and we herein investigated the possibility of combining such filtration with UV irradiation to address virus aerosols. Results showed that the removal efficiency of filtration towards f2 and MS2 phages depended on the type of commercial filter material and the filtration speed, with an optimal velocity of 5 cm/s for virus removal. Additionally, it was found that UV irradiation had a significant effect on inactivating viruses enriched on the surfaces of filter materials; MS2 phages had greater resistance to UV-C irradiation than f2 phages. The optimal inactivation time for UV-C irradiation was 30 min, with higher irradiation times presenting no substantial increase in inactivation rate. Moreover, excessive virus enrichment on the filters decreased the inactivation effect. Timely inactivation is therefore recommended. In general, the combined system involving filtration with UV-C irradiation demonstrated a significant removal effect on virus aerosols. Moreover, the system is simple and economical, making it convenient for widespread implementation in air-conditioning systems.     

用物化法处理卷烟厂综合废水的实践

根据卷烟厂废水的特性,采用气浮加过滤,并在调节池辅以射流曝气的处理工艺,对郴州卷烟厂综合废水进行处理。实践证明,污染物的去除率达85%~95%,满足了达标排放的要求。      

鸡毛用作油烟净化过滤材料的实验研究

通过一系列试验对鸡毛吸附油脂及净化油烟的性能进行了研究 ,并将鸡毛制成过滤吸附板置于油烟净化设备中作为二级净化段对饭店厨房油烟净化进行了实际应用研究。结果表明净化效率较为理想。