What sewage treatment plant is used to treat acid wastewater?
Dec 01, 2021
What sewage treatment plant is used to treat acid wastewater?
Acid-containing wastewater is wastewater containing a certain amount of acid and a pH value of less than 6. Acid-containing wastewater can be divided into inorganic acid wastewater and organic acid wastewater, strong acid wastewater and weak acid wastewater, monoacid wastewater and polyacid wastewater, low concentration acid wastewater and high concentration acid wastewater. Usually, acid-containing wastewater contains not only a certain acid, but also harmful substances such as heavy metal ions and salts. So, what sewage treatment plant is used to treat acid-containing wastewater? Cation exchange treatment of environmentally friendly weak acids:
The spent acid and spent alkali are alternately passed through the weak acid cation exchange resin. When the acid passes through, the resin is converted into H form (R-Na plus HCl_-H plus NaCl) to remove the acid in the waste liquor. When the alkali passes through, the weak acid resin releases H plus , neutralizes the alkaline substances in the waste liquid, and converts the resin into a salt form (R-H plus NaOH_r-Na plus H2O), so that the treated acid can be recovered without reduction. use. Alkali wastewater basically meets the discharge standard. This method has been used in my country since the 1980s with good results. The emission qualification rate is 95 percent . In order to ensure that the pH value of the discharge is qualified, the working exchange capacity of the weak acid resin can only be used about 70 percent to prevent the leakage of H plus or OH-.
