水解酸化-好氧氧化-化学氧化-吸附工艺处理印染废水

对印染废水采用水解酸化-好氧氧化-化学氧化-吸附等进行连续处理。结果表明,该处理工艺具有废水处理效果好、出水水质稳定(出水水质达GB4287-92中的一级标准)、操作管理方便等优点,是处理印染废水的有效方法之一。     

Prediction and cause investigation of ozone based on a double-stage attention mechanism recurrent neural network

● Used a double-stage attention mechanism model to predict ozone. ● The model can autonomously select the appropriate time series for forecasting. ● The model outperforms other machine learning models and WRF-CMAQ. ● We used the model to analyze the driving factors of VOCs that cause ozone pollution. Ozone is becoming a significant air pollutant in some regions, and VOCs are essential for ozone prediction as necessary ozone precursors. In this study, we proposed a recurrent neural network based on a double-stage attention mechanism model to predict ozone, selected an appropriate time series for prediction through the input attention and temporal attention mechanisms, and analyzed the cause of ozone generation according to the contribution of feature parameters. The experimental data show that our model had an RMSE of 7.71 μg/m³ and a mean absolute error of 5.97 μg/m³ for 1-h predictions. The DA-RNN model predicted ozone closer to observations than the other models. Based on the importance of the characteristics, we found that the ozone pollution in the Jinshan Industrial Zone mainly comes from the emissions of petrochemical enterprises, and the good generalization performance of the model is proved through testing multiple stations. Our experimental results demonstrate the validity and promising application of the DA-RNN model in predicting atmospheric pollutants and investigating their causes.     

城市小区域防灾对策与紧急避难区的设置

鉴于地震等自然灾害的突发性和巨大破坏作用,在现代大都市的不同区域按照人口密度设置应急避难场所和躲避设施可以有效减小地震等灾害伤亡和经济损失。结合对城市震害特点的分析,提出按社区、楼宇设置小区域防灾避难场所的防灾对策和就近分散、应急维生、多功能防御、功能复用等防灾原则,以期减少地震次生灾害发生,为灾后生产恢复和重建创造有利条件,最大程度减低灾害损失。     

Does green environmental innovation really matter for carbon-free economy? Nexus among green technological innovation,green international trade,and green power generation

Environmental Science and Pollution Research - This study examines the association among the green energy production (GEP), green technological innovation (GTI), and green international trade (GIT)...     

A critical review on adsorption and recovery of fluoride from wastewater by metal-based adsorbents

Environmental Science and Pollution Research - Rapid industrialization is deteriorating water quality, and fluoride pollution in water is one of the most serious environmental pollution problems....     

浅析油气田回注污水余热的利用——以辽河油田公司沈阳采油厂为例

辽河油田公司沈阳采油厂的原油伴生水,平均温度47℃,若不加以利用地将温水直接回注到地层,将会造成热能浪费。如果通过余热利用,则节约能源。文章通过现状调查、经济、技术、政策可行性分析认为:沈阳采油厂污水余热的可挖潜力很大,回用污水余热在技术与政策方面均有较大的可行性且具有可观的经济效益。     

A historical record of trace metal deposition in northeastern Qinghai-Tibetan Plateau for the last two centuries

Environmental Science and Pollution Research - Owing to rapid socio-economic development in China, trace metal emissions have increased and lakes even in remote areas have experienced marked...     

Numerical model for static chamber measurement of multi-component landfill gas emissions and its application

The quantitative assessment of landfill gas emissions is essential to assess the performance of the landfill cover and gas collection system. The relative error of the measured surface emission of landfill gas may be induced by the static flux chamber technique. This study aims to quantify effects of the size of the chamber, the insertion depth, pressure differential on the relative errors by using an integrated approach of in situ tests, and numerical modeling. A field experiment study of landfill gas emission is conducted by using a static chamber at one landfill site in Xi’an, Northwest China. Additionally, a two-dimensional axisymmetric numerical model for multi-component gas transport in the soil and the static chamber is developed based on the dusty-gas model (DGM). The proposed model is validated by the field data obtained in this study and a set of experimental data in the literature. The results show that DGM model has a better capacity to predict gas transport under a wider range of permeability compared to Blanc’s method. This is due to the fact that DGM model can explain the interaction among gases (e.g., CH₄, CO₂, O₂, and N₂) and the Knudsen diffusion process while these mechanisms are not included in Blanc’s model. Increasing the size and the insertion depth of static chambers can reduce the relative error for the flux of CH₄ and CO₂. For example, increasing the height of chambers from 0.55 to 1.1 m can decrease relative errors of CH₄ and CO₂ flux by 17% and 18%, respectively. Moreover, we find that gas emission fluxes for the case with positive pressure differential (?P_in-out) are greater than that of the case without considering pressure fluctuations. The Monte Carlo method was adopted to carry out the statistical analysis for quantifying the range of relative errors. The agreement of the measured field data and predicted results demonstrated that the proposed model has the capacity to quantify the emission of landfill gas from the landfill cover systems.

     

风冷式干除渣系统设备故障分析及处理

针对风冷式干除渣设备在应用中出现闸斗堵焦,碎渣机上部蓬焦,清扫链脱轨,碎渣机易损件、斗提机链条和提斗使用周期短等问题,通过对故障原因进行分析,提出了改造方案及措施。改造结果表明:风冷式干除渣系统运行的稳定性、安全性和使用寿命均得到了提高,取得了良好的效果。     

Mechanistic insight into the inhibitory effect of artemisinin sustained-release inhibitors with different particle sizes on Microcystis aeruginosa

Environmental Science and Pollution Research - Environment-friendly algaecides based on allelopathy have been widely used to control harmful algal blooms. In this research, micro and nano scale...