CN-122010248-A - Salt regulation type single-chamber electrolytic chlorine removal method

CN122010248ACN 122010248 ACN122010248 ACN 122010248ACN-122010248-A

Abstract

The invention discloses a salt regulation type single-chamber electrolytic chlorine removal method, which belongs to the technical field of wastewater treatment and comprises the steps of S1, detecting chloride ions and endogenous buffer cations in wastewater to be treated, calculating the environment matching characteristic ratio of the chloride ions and the endogenous buffer cations, S2, judging the type of wastewater according to the environment matching characteristic ratio obtained in S1, wherein the type of wastewater comprises self-balancing wastewater and unbalanced wastewater, if the type of wastewater is the unbalanced wastewater, adding an electrolytic environment regulator to enable the concentration of the chloride ions and the metal cations in the wastewater to meet a high-efficiency chlorine removal interval to obtain regulated wastewater, and S3, introducing the self-balancing wastewater or the regulated wastewater of S2 into a single-chamber electrolytic reactor for electrolytic reaction to remove chlorine in the wastewater. The invention has the advantages of high chlorine removal efficiency, simple process and low cost of the electrolysis device, and is suitable for industrial scale application.

Inventors

CHEN GUODONG
WANG TONGYU
LENG XUEBING
LI HANGKAI
Tan Wendie

Assignees

南京工程学院

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (10)

1. A salt regulation type single-chamber electrolytic chlorine removal method is characterized in that: The method comprises the following steps: S1, detecting chloride ions and endogenous buffer cations in wastewater to be treated, and calculating an environment matching characteristic ratio of the chloride ions and the endogenous buffer cations; S2, judging the type of wastewater according to the environment matching characteristic ratio obtained in the step S1, wherein the type of wastewater comprises self-balancing wastewater and unbalanced wastewater, and if the wastewater is unbalanced wastewater, adding an electrolysis environment regulating agent to ensure that the concentration of chloride ions and metal cations in the wastewater meets a high-efficiency chlorine removal interval to obtain regulating wastewater; S3, introducing the self-balancing wastewater or the regulating wastewater of the S2 into a single-chamber electrolytic reactor for electrolytic reaction, and removing chlorine in the wastewater.
2. The salt-regulated single-compartment electrolytic chlorine removal method of claim 1, wherein: in the S1, the endogenous buffering cations include magnesium, zinc, calcium and sodium; The environment matching feature ratio is the molar ratio of chloride ions to endogenous buffering cations.
3. The salt-regulated single-compartment electrolytic chlorine removal method of claim 2, wherein: In the step S2, the method for judging the type of the wastewater is as follows: If R Cl is more than or equal to 2:1 and is more than or equal to 3:1, the type of the wastewater is self-balancing wastewater; If R Cl < 2:1 or R Cl > 3:1, the wastewater type is an unbalanced wastewater; Wherein R Cl is the environment matching feature ratio.
4. The salt-regulated single-compartment electrolytic chlorine removal method of claim 3, wherein: In the step S2, the electrolytic environment regulating agent is divided into a first electrolytic environment regulating agent and a second electrolytic environment regulating agent, wherein the first electrolytic environment regulating agent comprises one or more of soluble magnesium salt and sodium salt which do not contain chloride ions, and the second electrolytic environment regulating agent comprises one or more of soluble zinc salt and calcium salt which do not contain chloride ions; If the endogenous buffering cations in the unbalanced wastewater are magnesium or sodium, adding the first electrolytic environment regulating agent; and if the endogenous buffering cations in the unbalanced wastewater are zinc or calcium, adding the second electrolytic environment regulating agent.
5. The salt-regulated single-compartment electrolytic chlorine removal method of claim 4, wherein: The first electrolytic environment regulator and the second electrolytic environment regulator also comprise auxiliary components, wherein the auxiliary components are one or more of a pH buffering agent and a dispersing agent.
6. The salt-regulated single-compartment electrolytic chlorine removal method of claim 5, wherein: the pH buffering agent is one or more of sodium citrate and sodium gluconate; the dispersing agent is one or more of polyethylene glycol and modified cellulose; the mass fraction of the auxiliary component in the electrolytic environment regulating agent is 0.1-5.0%.
7. The salt-regulated single-compartment electrolytic chlorine removal method of claim 1, wherein: In the step S2, the efficient chlorine removal interval is: 2∶1≤R Cl1 ≤3∶1; Or R Cl2 is more than or equal to 2.5:1 and less than or equal to 3.5:1; Wherein R Cl1 is the mole ratio of chloride ion to magnesium ion/sodium ion in the wastewater, and R Cl2 is the mole ratio of chloride ion to zinc ion/calcium ion in the wastewater.
8. The salt-regulated single-compartment electrolytic chlorine removal method of claim 1, wherein: in the single-chamber electrolytic reactor, the anode is a titanium plate, the cathode is an iron plate, and the power supply is a direct current power supply.
9. The salt-regulated single-compartment electrolytic chlorine removal method of claim 8, wherein: in the electrolysis process of the S3, the power supply voltage is 6.5-8.0V, and the pH value of an electrolysis system is dynamically maintained to be 1.3-5.6 by utilizing the electrolysis environment regulator.
10. The salt-regulated single-compartment electrolytic chlorine removal method of claim 8, wherein: the electrolytic cell of the single-chamber electrolytic reactor is internally provided with a sieve plate and an aeration disc, wherein the sieve plate is fixed at the lower part of the electrolytic cell, and the anode and the cathode are arranged on the sieve plate; the top of the electrolytic tank is also provided with a gas collecting hood for recycling gas generated by electrolysis.

Description

Salt regulation type single-chamber electrolytic chlorine removal method Technical Field The invention belongs to the technical field of wastewater treatment, relates to a chlorine removal method for content wastewater, and in particular relates to a salt regulation type single-chamber electrolysis chlorine removal method. Background At present, the mainstream chlorine removal technology has obvious economic or technical bottlenecks, for example, the chemical precipitation method has the problems of high medicament cost, large sludge amount and the like, the ion exchange method has the problems of easy poisoning of resin, frequent regeneration and the like, and the electrodialysis method has the problems of expensive membrane components, easy blockage and the like. The electrochemical oxidation method is focused on the characteristics of cleanliness and controllability, but also faces great challenges in practical engineering application, namely, on one hand, the ion components in industrial wastewater are extremely complex and have severe fluctuation, the conventional electrolysis usually sets fixed voltage or current, the decisive influence of the relative abundance of key coexisting metal ions and chloride ions in the wastewater on the electrode reaction selectivity is ignored, and on the other hand, the electrode scaling or the reaction efficiency is suddenly reduced under the condition of strong hydrogen evolution side reaction. The existing improvement method focuses on the modification of electrode materials, and from the aspect of active regulation of solution chemical environment, stable chlorine removal efficiency is difficult to maintain in dynamically-changed water quality. Therefore, development of a new chlorine removal process capable of responding to the change of water quality characteristics in real time and locking the optimal interval of electrolytic reaction through simple exogenous medium regulation is needed. Disclosure of Invention The invention provides a salt-regulated single-chamber electrolytic chlorine removal method, which aims to overcome the defects of the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: A salt regulation type single-chamber electrolytic chlorine removal method comprises the following steps of S1, detecting chloride ions and endogenous buffer cations in waste water to be treated, calculating an environment matching characteristic ratio of the chloride ions and the endogenous buffer cations, S2, judging the type of the waste water according to the environment matching characteristic ratio obtained in S1, wherein the type of the waste water comprises self-balancing waste water and unbalanced waste water, if the waste water is unbalanced, adding an electrolytic environment regulator to enable the concentration of the chloride ions and the metal cations in the waste water to meet a high-efficiency chlorine removal interval to obtain regulated waste water, and S3, introducing the self-balancing waste water or the regulated waste water of S2 into a single-chamber electrolytic reactor to perform electrolytic reaction to remove chlorine in the waste water. In order to optimize the technical scheme, the specific measures adopted further comprise: Further, in the step S1, the endogenous buffering cations comprise magnesium, zinc, calcium and sodium, and the environment matching characteristic ratio is the molar ratio of chloride ions to the endogenous buffering cations. Further, in the step S2, the judging method of the wastewater type is that if R Cl is more than or equal to 2:1 and less than or equal to 3:1, the wastewater type is self-balancing wastewater, and if R Cl is more than or equal to 2:1 or R Cl is more than or equal to 3:1, the wastewater type is unbalanced wastewater, wherein R Cl is the environment matching characteristic ratio. Further, in the step S2, the electrolytic environment regulating agent is divided into a first electrolytic environment regulating agent and a second electrolytic environment regulating agent, wherein the first electrolytic environment regulating agent comprises one or more of soluble magnesium salt and sodium salt which do not contain chloride ions, the second electrolytic environment regulating agent comprises one or more of soluble zinc salt and calcium salt which do not contain chloride ions, the first electrolytic environment regulating agent is added if the endogenous buffering cation in the unbalanced wastewater is magnesium or sodium, and the second electrolytic environment regulating agent is added if the endogenous buffering cation in the unbalanced wastewater is zinc or calcium. Further, the first electrolytic environment regulator and the second electrolytic environment regulator further comprise auxiliary components, wherein the auxiliary components are one or more of a pH buffer and a dispersing agent, the pH buffer is used for constructing complexation-d