With the development of national economy and the transformation of strategic policies, the technology of rational treatment of aerobic composting such as domestic waste has also been greatly promoted, and a large amount of waste has caused more and more serious pollution to the environment. We know that composting is an effective means to achieve harmless, reduction and resource utilization of organic solid waste. If compost products are applied to the soil, it can not only effectively solve the environmental problems of municipal sludge, livestock and poultry manure, municipal waste and other solid wastes, but also fully supplement soil organic matter and nutrients.

        However, there are many factors that affect the effect of composting, such as temperature, oxygen content, humidity,PHandC/NAmong them, oxygen is the direct parameter of microbial activity in the process of composting. If the oxygen concentration in the composting process can be monitored in real time, people can adjust the ventilation and oxygenation status according to the change of oxygen in the pile in time, supply the oxygen needed for microbial activities in time, avoid the generation of anaerobic environment, and improve the fermentation efficiency. At the same time, the maturity of compost can be judged according to the change of oxygen consumption rate in different periods.

        The following figure1Describes a typical adoptionSSTOxygen monitoring system made of zirconia probe and transducer plate. Among them, the gas acquisition system consists of a probe, an air pump and a gas circuit, and the gas detection part consists of a zirconia sensor and a transmission board. When the extracted gas flows through the oxygen sensor, the electrical signal generated by the transmitter generates a digital signal of oxygen concentration, which is collected and stored by the computer through the transmission line in real time, and can also be displayed or stored on the display.

There are many kinds of aerobic fermentation equipment, and the common application models are shown in the figure.2. In the aerobic fermentation of the composting process, oxygen has an important effect on the stability of the compost. Adequate oxygen supply can ensure the activity of microorganisms and accelerate the stability and maturity of compost. Insufficient oxygen supply can lead to unstable compost and biological toxicity. However, unstable compost products inhibit plant growth and seed germination, and introduce harmful substances and various pathogenic bacteria, causing plant diseases. It can be seen that the process of detecting oxygen is also a very critical part of the system.

After zui, let's look at the parameters of the two products mentioned above. They are all from England.SSTproducts, andO2I-FLEX-092The transmission board has three output signals to choose from, which can output voltage, output current andRS232Communication is very flexible and is very suitable for use in gas detection systems that receive different output signals.

    O2S-FR-T2-18A                                                                                          O2I-FLEX-092