Generation and Discharge of Pollutants in Closed Aquaculture

[Objectives]To gain an in-depth understanding of pollutant generation and discharge from closed aquaculture.[Methods]In 2018,the pollutant generation and discharge coefficients of 7 farming modes in 16 farming bases were calculated and analyzed.[Results]A total of 28 pollutant generation coefficients and 28 pollutant discharge coefficients were obtained,and the generation and discharge of pollutants in closed aquaculture were grasped preliminarily.Compared with the data of the first census of pollutions sources published by the state in 2008,7 kinds of pollution generation coefficients increased,while 14 kinds decreased;and 4 kinds of pollutant discharge coefficients increased,while 17 kinds decreased.[Conclusions]In recent years,the pollutant generation and discharge coefficients of aquaculture show a decreasing trend.

A Study of Chinese Government’s Policies in Industrial Pollution Mitigation

China＇s rapid economic growth poses serious concerns over environmental degradation, especially in the context of higher pollution levels resulting from unprecedented industrial activity. It is commonly held that government policies are effective in the form of investment in pollution control and the imposition of a discharge fee on industrial units for the purpose of safety of environmental quality. In this study, we find that government policies do not prove to be successful in controlling air pollution in comparison to water pollution. Furthermore, air pollution is increasing, while water pollution is following a stable, decreasing curve. Hence, some reforms need to be implemented in government policies, particularly those concerning the effectiveness of investment in environmental protection and improving managerial skills in industry.

Hazardous waste incineration in a rotary kiln:a review

Hazardous waste output in the world is increasing every year.To achieve higher efficiency and lower pollution,the incin-eration technology for hazardous waste needs to be studied further.This study mainly reviews the research progress in incineration,slagging,and pollutant emission in the rotary kiln in China and abroad in the last 10 years,and conducts a comprehensive analysis and evaluation of the research.Considering that there are many variables involved in the incineration process,the incineration law cannot be validated in a limited timeframe by experiments.Researchers often use computer simulations to predict and verify the incineration process through experiments and to provide reference opinions for com-mercial operations.Through the analysis of the research progress in rotary kilns,it is observed that the basic research in rotary kilns is becoming mature.The latest research trend in rotary kilns is interdisciplinary and mixed research.From a new perspective,further research should be focused on a comparative analysis of the rotary kiln and the cement kiln,full life cycle assessment of the impact factors of rotary kiln on the environment,the impact of the factory treatment process on the workers’health,etc.The research direction of rotary kiln in China and abroad for the future has been predicted reasonably.