Efficient Nickel Removal Agent and Heavy Metal Capture Agent for Industrial Wastewater Treatment

Efficient Nickel Removal Agent and Heavy Metal Capture Agent for Industrial Wastewater Treatment

Currently, in the Yangtze River Delta, Pearl River Delta and other regions, there are strict environmental protection requirements for the emission of industrial Class I pollutant nickel, requiring that the nickel content at the discharge outlet of Class I pollutant workshops shall not exceed 0.1 mg/L. When considering how to meet the standards for treating nickel containing wastewater, enterprises should also consider how to reduce the investment and operating costs of chemical nickel wastewater treatment equipment.

Due to the presence of pollutants in the wastewater of electroless nickel platingHypophosphorous and hypophosphite, these two salts react with nickel ions to form stable complexes. The common treatment method for this wastewater on the market is to use Fenton reaction to break the complexes and then add water treatment agents such as heavy metal capture agents for treatment. This method has a certain treatment effect, but its drawbacks are also very obvious. The concentration changes of chemical nickel wastewater require continuous adjustment of the dosage; The amount of sludge generated by the Fenton reaction is also relatively large.

The highly efficient nickel removal agent independently developed by Zhanqing chelates heavy metal ions through different chelating groups, improves sedimentation rate and removal efficiency through flocculation and net capture. After adding the highly efficient nickel removal agent, the chemical nickel wastewater can be directly precipitated and removed without breaking the network, meeting the discharge standard requirement of nickel concentration not exceeding 0.1 mg/L at the discharge outlet of Class I pollutant workshops.

2、 Usage method

operating steps

1) Take 1L of wastewater, measure the content of various heavy metals, and calculate the total content of heavy metals;

2) Adjust the pH to 10-11, add M2 in an amount 10 times the total heavy metal content, and stir the reaction

10min；

For example, if the total content of heavy metals is 20mg/L, then the dosage of M2 is 200mg/L, that is

The amount of 5% M2 added per liter of water is 4ml

3) Add PAC equivalent to M2 dosage and stir for 5 minutes;

4) Add 5ml PAM solution (0.1%), slowly stir for 2 minutes, and precipitate for 30 minutes;

5) Filter with filter paper and measure heavy metal content;

6) If the supernatant is turbid, it is recommended to increase the dosage of PAC and precipitate again;

Precautions

1) Solution ratio: It is recommended that M2 be 5%, PAC be 5%, and PAM be 0.1%;

2) M2 dosage: The dosage of M2 is generally 10-20 times the total heavy metal content;

3) Qualitative testing to determine if heavy metals have been completely removed: Add M2 solution to the filtrate. If there is discoloration or precipitation, it indicates

Heavy metal ions have not been completely removed; If there is no discoloration or precipitation, it proves that the heavy metals have been removed completely;

4) Qualitative testing of whether M2 is excessive: adding raw wastewater to the filtrate, discoloration or precipitation occurs, indicating

M2 excess; If there is no discoloration or precipitation, it proves that M2 is not excessive;

5) The dosage of PAC should not be less than 100ppm, which means at least 5ml of 2% PAC solution should be added to 1L of wastewater.

Efficient Nickel Removal Agent and Heavy Metal Capture Agent for Industrial Wastewater Treatment