Intermittent Vertical Flow Constructed Wetland Nitrogen Removal Simulation Experimental Device and Experimental Method

Abstract

The invention relates to the technical field of sewage treatment, in particular to an intermittent vertical flow artificial wetland denitrification simulation experiment device and an experiment method. It includes a dynamic test device, a water storage device, and a temperature control device. It also includes an aeration device, a stirring device, a pH value adjustment device and a control system. A dissolved oxygen concentration sensor and a pH value sensor are installed in the dynamic test device. After the concentration sensor detects the dissolved oxygen concentration, it sends a detection signal to the controller. After receiving the detection signal, the controller sends a signal for controlling the opening and closing of the aeration device to the aeration device, and at the same time sends a signal for controlling the opening and closing of the agitation device to the agitation device. device. The invention can monitor the aeration rate in real time, the experimental results are accurate and fast, and the removal rate of pollutants in various environments can be accurately obtained, and the dissolved oxygen concentration and aeration required when the pollutants in unit volume of sewage reach the highest removal rate can be quickly obtained quantity and apply it in practice.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an intermittent vertical flow artificial wetland denitrification simulation experiment device and an experiment method. Background technique [0002] With the development of society and the accelerated pace of urbanization, the population density continues to increase, and various human activities have rapidly aggravated water pollution. As a large agricultural country, China's water environment continues to be affected by agricultural pollution sources, and the use of phosphorus and nitrogen fertilizers far exceeds that of the United States and many other countries. In addition, the daily activities of urban residents are the main cause of pollution of water bodies along rivers and coastal areas. Urban domestic sewage accounts for one-third of the total waste water. This type of water contains a large number of harmful chemicals, including industrial chemicals, househo...

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Problems solved by technology

There are problems in these two existing control methods: first, the measurement control cannot reflect the change of the influent load (water volume, water quality) of the sewage plant in time; it cannot reflect the change of oxygen demand caused by the change of the microbial growth environment; the actual supply The air volume is generally greater than the demanded air volume, the energy consumption of the blower aeration is high, and the degree of automation is low

Second, manual on-site control, local valve adjustment will affect the gas supply volume of other gas supply branch pipes, and the adjustment is very difficult; the effect of manual control is closely related to the experience of the operator; the reliability of the control is relatively low, and adjustments are easy to occur Excessive situation; if frequent adjustments are made, it is easy to cause fluctuations in dissolved oxygen concentration

The above patents can calculate and optimize dissolved oxygen in real time through the intelligent calculation module and parameter optimization module, and then control the blower adjustment module and air flow distribution module, which can adapt to changes in water quality and flow, so as to maintain the stability of dissolved oxygen and make aeration The aeration rate of the pool can meet the needs of biochemical reactions. The intelligent calculation module calculates the biological oxygen demand and dissolved oxygen in real time, and provides the calculated results to the blower adjustment module and the air flow distribution module, so that the aeration system can follow the biological oxygen demand. The amount of air supply changes, but the change of microbial growth environment in the aeration tank will cause the change of oxygen demand. If the air supply is changed according to the change of oxygen demand, the blower and the electric flow control valve will be opened and closed frequently. Use The life will be shortened, which is not conducive to energy saving, and at the same time increases the cost of use

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