The paper industry is a large user of water and one of the major industries that generates wastewater. Paper industry wastewater can be divided into two types: sulfate pulp wastewater and sulfite pulp wastewater. Among them, the wastewater discharged from the pulp process is the most serious. The dark brown wastewater discharged during pulp washing is called black liquor; the wastewater discharged from the bleaching process contains acid, alkali, BOD and other substances; in the papermaking process, the wastewater discharged from the paper machine is called white water. Black liquor and white water are the main wastewaters in the paper industry. Papermaking wastewater contains a large amount of chemical reagents or various impurities. If it is directly discharged, it will have a huge impact on the surrounding environment. One characteristic of papermaking wastewater is that it contains strong acid or alkaline wastewater, mostly alkaline wastewater, and the pH value will change in different papermaking processes. The monitoring and adjustment of pH value in paper mills is very important. The online pH controller developed and produced by Delfino can be used with a variety of analog pH sensors to achieve real-time online monitoring of the pH value of water quality in different process sections of the paper mill. Controlling the pH value of water quality plays a vital role in the activity of water microorganisms and the rate of decomposition of organic matter. The pH value of wastewater treatment in paper mills depends not only on the paper production process, but also on the process used in the sewage treatment station. Generally speaking, all sewage treatment effluent must be close to neutral, because neutral wastewater is closer to natural water bodies and will not have much impact on surrounding water bodies. Therefore, most national discharge standards require the pH value of water to be between 6 and 9 pH. between. The same is true for the pH requirements for wastewater discharge from paper mills. For example, the pH value of wastewater produced by alkaline pulping is between 9 and 10 pH, and the pH value of wastewater produced by acid pulping is around 1 and 2 pH. In order to save wastewater treatment costs, reduce For the dosage of chemicals, a pH controller is usually used to control the dosing pump to adjust the pH value of alkaline wastewater to 8~9pH and acidic wastewater to 6~7pH. This is a more cost-effective adjustment method.
Features
The pH controller can be paired with an online PH Sensor and used in different process sections of papermaking to respond quickly and accurately monitor pH value in real time. The online pH controller has 2 settable SPST relays, which can set high and low alarms, control the dosing pump to add medicine, and adjust the pH value of the solution.
The pH analyzer has two 4-20mA current outputs, which can realize data transmission, and the RS485 communication method can also be selected.
3.2-inch LCD display, black and white graphic dot matrix, password can be set to prevent misoperation, supports quick calibration, easy to use.
Specification | Product Name | Online pH controller |
| Measuring Range | pH:0~14pH? ?ORP:-2000~2000mV? ? Temp.:-10~150℃ |
| Resolution | pH:0.01pH? ? ORP:1mV? ? Temp.:0.1℃ |
| Temp. Compensation | Automatic (PT1000/NTC10K) or manual |
| Accuracy | 0.1% FS? ?or pH: ± 0.02pH, ORP: ±2mV, take the larger one |
| Display Screen | 3.2 inch LCD screen |
| Calibration Method | pH: 3 points;? ? ORP: 2 ponits |
| Relay Output | 2 SPST relays,max. load 3A/250VAC |
| Current Output | Two 0/4~20mA |
| Digital Output | RS485 interface, MODBUS RTU |
| Protection Grade | IP66 |
| Working Temperature | 0~60°C |
| Dimension | 100*100*120mm |
| Material | Enhanced ABS |
| Installation Method | Panel |
Delfino company focuses on the research, development and production of water quality instruments. Our main products include pH ORP analyzer, conductivity analyzer, turbidity analyzer, COD analyzer, dissolved oxygen analyzer, ammonium analyzer, chlorine analyzer, etc. The pH value in paper mill drainage is an important indicator. Using a pH online controller to monitor the pH value can promptly detect and solve the problem of abnormal pH in the drainage, ensuring that the discharged water quality meets national and local environmental protection standards. If the pH value of the discharge is too high or too low, it will cause serious damage to the water ecosystem, leading to the extinction of aquatic life, deterioration of water quality and other problems. In addition, during the production process of paper mills, the pH value of drainage also has a certain impact on production quality. If the pH value in the drainage is unstable or exceeds the standard, it will affect the stability and quality of paper production, lead to a decline in product quality, and affect the economic benefits of the enterprise. If you are interested in pH controllers or other water quality instruments, please contact us!
Suzhou Delfino Environmental Technology Co., Ltd.
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