Study on the Technology of Regulating the pH of Saline Wastewater by Diaphragm Electrolysis

Using diaphragm electrochemistry instead of H₂SO₄ and NaOH to adjust the pH of saline wastewater was studied. The results showed that the pH of the effluent from the cathode membrane anode chamber was 3.54 and the conductivity was 10.33 mS/cm, the pH of the effluent from the anode chamber of the anode membrane was 3.62, and the conductivity was 5.31 mS/cm, the pH of the effluent from the anode cathode chamber was 8.22, and the conductivity was 10.12 mS/cm, the pH of the effluent from the cathode chamber of the cathode membrane was 8.10, and the conductivity was 9.64 mS/cm. A combination of anode and cathode membrane chambers was used to adjust p H with a power consumption of 22.14 kW·h/t, equivalent to a cost of 16.61 yuan. The decrease in effluent conductivity was 36.97%, the cost of acid-base chemical method was 2.22 yuan, and the increase in effluent conductivity was 46.82%, the diaphragm electrochemical method had a significant effect on reducing conductivity and had certain application prospects.