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There are many types of industrial wastewater treatment, in addition to that used for treating wastewater from industries such as chemicals, pharmaceuticals, and food processing； Engineering wastewater treatment in different industries has typical characteristics. Water pollution index: The water pollution index is a numerical measure that indicates the degree of pollution in water bodies; it also serves as an important basis for ensuring the proper operation of water treatment equipment. Among them, the most commonly used water pollution indicators are (8). Water pollution indicators are numerical values used to measure the degree of water pollution and serve as an important basis for monitoring the operation of water treatment equipment. The most commonly used water pollution indicators are (8): Biochemical Oxygen Demand (BOD): This indicates the amount of free oxygen consumed by aerobic microorganisms at 20°C over a certain number of days to degrade the organic matter in one liter of water, under conditions of saturated oxygen. The unit used is mg/L; 5 days is typically taken as the standard time for measuring BOD, which is then denoted as BOD5. (Biochemical oxygen demand (BOD): It represents the amount of free oxygen consumed by aerobic microorganisms to degrade organic matter in each liter of water at 20℃ over a certain number of days under conditions of saturated oxygen. It is commonly expressed in units of mg/L. BOD is usually measured over a period of 5 days and denoted as BOD5. Chemical oxygen demand (COD): It represents the amount of oxygen equivalent required to oxidize organic matter into H2O and CO2 using strong oxidants.) The commonly used oxidants are potassium dichromate or potassium permanganate, denoted as CODCr or simply COD, and CODMn (also known as oxygen demand, abbreviated as OC), with units of mg/L. (Chemical oxygen demand (COD): refers to the amount of oxygen equivalent to that required to oxidize organic matter into H2O and CO2 using strong oxidants. The commonly used oxidants, such as dichromate potassium or permanganate potassium, are expressed as CODCr, COD, or CODMn (also known as oxygen consumption, or OC), in mg/L. Total oxygen demand (TOD): refers to the amount of oxygen consumed when organic matter is completely oxidized, with C, H, N, and S being oxidized respectively into CO2, H2O, NO, and SO2; it is expressed in mg/L. (Total oxygen demand (TOD): It refers to the amount of oxygen consumed when organic matter is completely oxidized, with C, H, N, and S being converted respectively into CO2, H2O, NO, and SO2; the unit is mg/L. Total organic carbon (TOC): This indicates the total carbon content of organic pollutants in water, expressed as a carbon concentration, with the unit also being mg/L.) Suspended solids (SS): The substances retained on the filter membrane or filter paper after filtering the water sample, measured in mg/L. pH: Indicates the acidity or alkalinity of wastewater. (The total carbon content of organic pollutants in water is expressed in terms of carbon content, with the unit being mg/L. Suspended solids (SS): substances that remain trapped on the filter membrane or filter paper after the water sample has been filtered, measured in mg/L. pH: refers to the acidity or alkalinity of wastewater. Toxic substances: represent the amount of substances present in water that are harmful to organisms, such as cyanides, arsenic compounds, mercury, cadmium, chromium, lead, etc.; the unit for these values is mg/L.) (To*c substance: refers to the concentration of biologically harmful substances in water, such as cyanide, arsenide, mercury, cadmium, chromium, lead, etc., expressed in mg/L. Number of E. coli: refers to the count of E. coli per liter of water, with the unit being cells/L.) (1) During the treatment of printing and dyeing wastewater, the quality of the wastewater discharged varies depending on the type of dye used, and this affects the difficulty of treatment. The printing and dyeing industry is a major consumer of water. By treating printing and dyeing wastewater to meet regulatory standards and simultaneously carrying out advanced treatment for its reuse, as well as by separating clean water from polluted water for comprehensive utilization, it is possible to significantly reduce water consumption. (2) Large volumes of water are involved in the treatment of wastewater from paper manufacturing, and the wastewater from recycled paper treatment contains large amounts of calcium salts, which tend to cause scaling ； In addition, **reuse of reclaimed water is required to help users address the problem of high hardness and calcification in wastewater treatment, as well as to enable the reuse of wastewater after it has been thoroughly treated** ； At the invitation, provided technical support to companies such as Riven Paper and Jiangmen Mingxing Paper Industry. (3) Treatment of feed wastewater: Feed wastewater originates from the wastewater generated by odor removal through spray of waste gases in the feed production process, as well as from wastewater resulting from site cleaning; this wastewater contains biodegradable feed powder. Biotechnology is used to treat feed wastewater to meet reuse standards, allowing it to be recycled back into the spray treatment process for feed wastewater, thereby achieving zero discharge and full reuse of the wastewater. More than 20 feed wastewater treatment and reuse projects have been built. (4) When treating starch wastewater, the wastewater contains plant proteins and sulfates; in addition, starch particles are carried away with the wastewater, which increases its concentration and makes treatment more difficult. Pre-treatment may be necessary in such cases. (5) When treating citric acid wastewater, due to its high content of organic acids, it is necessary to prevent the accumulation of volatile fatty acids (VFA) during the wastewater treatment process. Different wastewater requires different treatment methods; professional wastewater treatment plans must be developed and implemented based on the specific characteristics of each manufacturing enterprise in order to ensure that industrial wastewater is treated to meet regulatory standards before it is discharged. In the use of wastewater, a large number of instruments are required to carry out data collection for chemical process automation as well as for on-site monitoring. As a domestic manufacturer of pressure transmitters, we offer pressure (gauge)/absolute pressure transmitters, which measure pressure signals with atmospheric pressure/vacuum as the reference point; these transmitters have only one port for connection to the process pipeline. The working principle of metal capacitive pressure (gauge pressure/absolute pressure) transmitters is as follows: when pressure acts on the surface of the metal sensing diaphragm, which has a certain thickness and serves as the elastic sensing element, through the isolation diaphragm and the pressure-transmitting medium, this causes a slight deformation in the diaphragm; the maximum deformation does not exceed 0.1 mm. A high-precision measurement circuit converts this slight deformation into a voltage signal that is linearly related to the pressure difference. After linearization and temperature compensation, a dedicated chip is used to convert this voltage signal into an industrial standard 4-20 mA current signal or a 1-5 V voltage signal. Thanks to the high sensitivity of the metal capacitive pressure sensor and the high-precision integrated circuits used in the detection circuit of the measuring diaphragm, which include linear and temperature compensation circuits, the entire transmitter achieves high precision and stability. Its extremely high overload resistance and excellent performance in micro-pressure measurement make it the ideal choice for the complex industrial environments in China. Connection components that are sealed by bolted joints around two surfaces are generally referred to as “flanges”. Huaheng Transmitter Manufacturer has developed two core technologies: sensors and smart circuit boards. This enables the company to master all the key technologies related to its products, and at the same time, it has improved the accuracy of its industrial automatic transmitters, raising it from 0.2 grade to 0.1 grade. Other products for measuring flow rate and temperature can also be developed by extending the core technologies already in use. Leveraging its core technologies in sensors and smart circuit boards, Huaheng Transmitter Manufacturer is able to modify these core technologies at low cost to meet customer requirements, thereby enabling the customization of personalized products. The main products include the SMART series of pressure transmitters, multi-parameter transmitters, flow meters, temperature sensors, and level sensors. As a manufacturer of level transmitters, it supplies industrial automatic transmitters with a high performance-to-price ratio for industries such as electricity, petroleum, chemicals, metallurgy, cement, and mining in China.