In agriculture, in order to make vegetables and other crops get more sufficient nutrients in the growth process, the use of fertilizer is necessary. Because inorganic fertilizer has the characteristics of high purity and fast fertilizer efficiency, it has been widely used. However, with the increase of usage, we found that inorganic fertilizer not only has certain harm to human body, but also causes pollution to the environment, such as excessive heavy metals, soil acidification and other problems.

With the development of modern agriculture to an environmentally friendly and ecologically coordinated green industry, people began to look for organic fertilizers to replace inorganic fertilizers, and compost is one of them. Composting is an organic fertilizer made by using the remains and excrement of animals and plants containing fertilizer components, plus the mixed accumulation of soil and minerals, under high temperature and humid conditions, through fermentation and decomposition of microorganisms.

Composting also has many functions, including waste utilization, reducing pollution, improving soil, increasing yield, improving quality, etc. Among them, there are two most important points: first, it can convert a large amount of organic waste into useful products and reduce the risk of environmental pollution; second, it can create valuable compost products, which can be used as soil conditioner or organic fertilizer products. The scientific use of these organic solid wastes can not only prevent environmental pollution, but also speed up the recycling of resources and reduce the waste of resources.

Composting can be divided into two kinds of general composting and high temperature composting. The fermentation temperature of the former is lower, the fermentation temperature of the latter is higher, and the latter is generally compacted. The high-temperature composting has a certain effect on promoting the decomposition of crop stalks, human and animal manure, weeds, garbage sludge and other deposits, as well as killing bacteria, eggs and weed seeds. Microorganisms will decompose the compost, and the decomposition is divided into aerobic decomposition and anaerobic decomposition. Because the aerobic decomposition is faster than the anaerobic decomposition, more composting is carried out by aerobic decomposition principle.

Oxygen is essential for composting with aerobic decomposition. 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. Therefore, we need to monitor the oxygen content in the composting process to achieve the best composting effect. Since there is a certain high temperature environment in the composting process, this side recommend use the zirconia sensor represented by Shenzhen.O2S-FR-T2-18XThe oxygen concentration was monitored.

The Zirconia Sensor from UKSSTThe principle of the company's manufacturing is to form an air chamber between two zirconia disks, and inflate and deflate the air chamber by applying voltage to one of the zirconia disks. The change of air pressure in the air chamber will cause the other zirconia disk to generate a certain voltage. After obtaining the voltage, the oxygen concentration in the environment can be obtained through formula conversion, which also requires them to heat themselves700°C。O2S-FR-T2-18XThe model sensor has its own thread, which can be locked to the wall of the composting reaction chamber, or the sensor can be locked to the pipeline and then pumped to the pipeline for detection by air pump. It also3The length of the probe is optional, respectively.55、45、28mm; The sensor itself is also wired, and there are3The length is optional, respectively.0.15、0.3、1.1m; Other parameters are as follows: