Yuan Mingzhe

On Simplified Model for Activated Sludge Wastewater Treatment Process and Simulation Based on Benchmark

Because of the complex structure and the numerous parameters of existing models for the activated sludge wastewater treatment process (WWTP), there are great difficulties to directly apply the models in simulation systems. In order to enhance the practicality of the models for the WWTP, a simplified model is developed based on the activated sludge model No. 1 (ASM1), which is the most widely studied model and published by the International Water Association (IWA). The simplified model is suitable for describing the process of carbon removal in the plug-flow activated sludge WWTP. It has a much simpler structure and less time cost in simulation. To validate the effectiveness fairly, the simplified model is applied based on the benchmark. The benchmark is a standard platform-independent simulation environment proposed by IWA defining a plant layout, a simulation model, influent data, test protocols and evaluation criteria. The simplified model replaces the ASM1 to describe the biological-chemical reactions of the reactors in the benchmark plant. The simulation result is closed to the test data using three different weather files and demonstrates the precision of the simplified model.

Application of the wastewater toxicity diagnosing technology based DO curve characteristics in treatment of dyeing wastewater

By cultivation of biofilm in the biological aerobic tank in the field to solve the problem that the diagnostic device of the toxic wastewater can not collect suspended activated sludge due to widespread use of contact oxidation process in dyeing wastewater treatment plant. Data obtained results from the running device is injected dyeing wastewater, including the integrity and reproducibility of DO (Dissolved Oxygen) curve, judgment of low load wastewater and diagnosis of toxic wastewater, are in line with the expected results, this show that the wastewater toxicity diagnosing technology and device based DO curve characteristics is suitable for dyeing wastewater treatment plants. It provide a practical technology and device for avoiding toxic substances against the biological treatment stage of dyeing wastewater treatment plant.

Intelligent control based on case-based reasoning for outlet tobacco moisture percentage of loosening resurgence machine

Tobacco loosening and resurgence process has strong nonlinearity and large delay-time ratio, and it is difficult to describe the process via accurate mathematical models. Thus, it is difficult to control the outlet tobacco moisture percentage (OTMP) for loosening and resurgence machine by operators. To solve these problems, combining the expert knowledge and operation experience, an intelligent control method based on case-based reasoning (CBR) is presented for loosening and resurgence machine. The intelligent control method is applied in certain cigarette plant which shows that the OTMP is controlled in the scope of target value and water consumption is reduced.

Design of intelligent control system for Vertical Roller Mill

In order to help the Vertical Roller Mill (VRM) working stably with higher automation level and lighter labor intensity, an intelligent automatic control system is designed by analyzing the characteristics and technology of the VRM grinding process, where both start/stop operation and normal work can be executed in automatic mode. Besides, Interlock protection is introduced so as to improve the security of the proposed system, which has not only improved the automation level of VRM system, but also guaranteed the stability and reliability effectively.

Control of Cement Precalciner Kiln

The cement industry in China is large in scale but not strong. This paper survey the state of advanced process control technologies applied in cement industry, and proposed an idea to research of automation of cement industrial in China.