Current position > Product detail
『Electroplating wastewater flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
What are the commonly used flow meters for sewage flow monitoring?
2. Process analysis of ion exchange method for treating nickel containing wastewater
Process analysis of ion exchange method for treating nickel containing wastewater Ion exchange method has become one of the core methods for treating nickel plating wastewater due to its advantages such as excellent water quality, recyclable metal resources, and improved water resource recycling efficiency.. The following analysis will be conducted from three aspects: principle, process scheme, and technical trend:
1. Technical principle: Ion exchange resin achieves nickel ion removal through reversible exchange reaction between functional groups and ions in water. Taking weakly acidic cation resin (such as Na type) as an example, the reaction process is divided into three steps: during the adsorption stage, when nickel containing wastewater passes through the resin layer, the following exchange reaction occurs: 2R COONa+Ni2? → (R-COO)? Ni + 2Na? Nickel ions are fixed on the resin, while sodium ions are released into the water. A clear green exchange band will form in the resin layer, which will move from bottom to top with the adsorption process. When the exchange belt reaches two-thirds of the column, the bottom resin appears dark due to saturation, and the regeneration program needs to be initiated. Image: Dynamic displacement process of resin exchange belt. During the regeneration stage, dilute sulfuric acid or hydrochloric acid (3% -5%) is first used to regenerate the resin: (R-COO)? Ni + H? SO? → 2R-COOH + NiSO? After regeneration, the resin is converted to H-type and needs to be transformed into Na type using sodium hydroxide solutio
2. Optimization of process scheme Resin selection strategy Weak acid cation resin (chelating resin): high exchange capacity, strong resistance to salt interference, suitable for high salinity wastewater.
. Domestic resins require hydrogen/sodium conversion, while imported resins (such as Dusheng CH-90) support hydrogen sodium dual operation, but the hydrogen exchange capacity is slightly lower. Strong acid cation exchange resin: susceptible to the influence of calcium and magnesium ions, resulting in a decrease in exchange capacity, requiring pre-treatment or regular backwashing. Standardized pretreatment process: domestic resin: repeatedly clean with hot water at 60-70 ℃ until foam decreases; Soak in ammonium sulfate solution for 30 minutes; Wash with deionized water to pH 5; Soak in a 4% sodium hydroxide solution for 30 minutes; Wash to pH 9 and set aside for later use. Imported resin: such as Dusheng CH-90, which is activated by sodium type upon leaving the factory, only needs to be rinsed with water for 30 minutes before being put into use. Process flow design: Fixed bed double column series connection: accustomed to the process, the stability of the effluent is improved by conn