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CN-121823834-A - Ecological water treatment system

CN121823834ACN 121823834 ACN121823834 ACN 121823834ACN-121823834-A

Abstract

The invention relates to an ecological water treatment system. Firstly, an electrodialysis method is used, and based on the electrodialysis method, a mixed solution of CrCl 3 and FeCl 3 is used for modifying a carboxymethyl cellulose membrane to prepare the hydrophobic cation exchange membrane. And the Ti/GaO 2 -G/PbO 2 electrode is used as an anode, and the Ti/GaO 2 -G/PbO 2 electrode has a large specific surface area and a pleated structure due to the GaO 2 -G interlayer, a plurality of tiny grains appear and gaps among the large grains are filled, so that the surface structure of the electrode is more compact, and more active sites are more beneficial to electrocatalytic oxidation. The electrodialysis method and the electrocatalytic oxidation are used for cooperatively treating the ecological water, so that the sterilization efficiency is enhanced, and the system is more remarkable in effect on ammonia nitrogen removal rate, chemical Oxygen Demand (COD) removal rate, total Phosphorus (TP) removal rate in wastewater and ecological water decolorization rate. Only electron transfer is involved in the electrocatalytic process, and secondary pollution is avoided, so that the ecological water treatment efficiency is higher.

Inventors

  • WANG CHAOGANG

Assignees

  • 重庆普康生物科技有限公司

Dates

Publication Date
20260410
Application Date
20230422

Claims (9)

  1. 1. An ecological water treatment system is characterized by comprising the following specific steps: S1, pretreatment of water, namely adding an aluminum chloride coagulant aid into a pool for storing ecological water, enabling the pH value of the ecological water to be 7.0-8.0, reacting the ecological water to generate floccules, separating to obtain ecological water filtrate, adding a sodium polyacrylate flocculant into the ecological water filtrate, and carrying out solid-liquid separation to obtain ecological water filtering supernatant; S2, preparing a modified carboxymethyl cellulose (CMC) film, namely taking 5 g/L-30 g/L of carboxymethyl cellulose (CMC) aqueous solution, adding 1 ml-4 ml of absolute ethyl alcohol as a reinforcing agent, adding 1 ml-2 ml of ethylene glycol as a plasticizer, stirring to obtain semitransparent and particle-free colloid, carrying out vacuum defoaming, coating the colloid on a smooth clean glass plate, naturally drying at room temperature, crosslinking for 10 min-15 min by using a mixed solution of CrCl 3 and FeCl 3 with mass fraction of 7.0% -9.0%, washing Cr 3+ and Fe 3+ on the surface by using distilled water, naturally drying, and stripping; S3, carrying out an electrodialysis method, wherein a plate graphite electrode is adopted as a cathode and anode, a catholyte is 1 mol/L-5 mol/L H 2 SO 4 , an anolyte is ecological water, and the two tanks are separated by the modified CMC film prepared in the step S1, and the current density is 30mA/cm 2 ; S4, preprocessing the Ti plate, namely placing the Ti plate in a 20% NaOH solution at the temperature of 30 ℃ for 15-25 min, then flushing the Ti plate with deionized water, then placing the Ti plate in absolute ethyl alcohol for multiple times of ultrasonic treatment, and drying; S5, adding 0.1G/L-0.3G/L graphene into a mixed solution containing 30% hydrochloric acid and 0.5MGaCb h-5 h of n-butanol, performing ultrasonic treatment and stirring for full mixing, immersing a Ti plate into the solution for 2-8 min, then placing the Ti plate in an oven for drying at 90-110 ℃ for 15-20 min, finally placing the Ti plate in a muffle furnace for calcining at 200-400 ℃ for 10-30 min, repeating the operation for 5-10 times, and prolonging the calcining time of the last time to 1-2 h, wherein the prepared electrode is Ti/GaO 2 -G; S6, dissolving Pb (NO 3 ) 2 and NaF in a mass ratio of 5:1 in a 0.1mol/L HNO 3 solution, dissolving for 1h through ultrasonic treatment, selecting a Ti/GaO 2 -G electrode prepared in the step S4 as an anode, taking a stainless steel sheet as a cathode, performing electrodeposition for 1h in a current density of 25mA/cm 2 in an electrodeposition solution at 65 ℃, thoroughly cleaning the electrode with deionized water after electroplating, and drying for 2-4 h in a drying oven at 60 ℃ to prepare a Ti/GaO 2 -G/PbO 2 electrode; And S7, performing electrocatalytic oxidation, namely performing electrolysis in an electrolytic tank, taking a Ti/GaO 2 -G/PbO 2 electrode as an anode, taking a stainless steel plate as a cathode, taking 1mol/L of catholyte as H 2 SO 4 , taking anolyte as ecological water, starting the power supply to electrolyze, wherein the current density is 50mA/cm 2 , and the electrolysis voltage is 8-10V. And S8, enabling the treated water to enter a sedimentation tank through an electrolytic tank, circulating for a plurality of times to form a circulating system, and circulating for 5-8 times to obtain the ecological water meeting the standard.
  2. 2. The ecological water treatment system according to claim 1, wherein the pH value of the ecological water is 7.5 after the coagulant aid is added in the step S1.
  3. 3. An ecological water treatment system according to claim 1 or 2, wherein in the step S2, the CrCl 3 solution with the mass fraction of 8.5% is used for crosslinking reaction for 15min.
  4. 4. The ecological water treatment system according to claim 1 or 3, wherein the catholyte in the step S3 is 1mol/LH 2 SO 4 .
  5. 5. An ecological water treatment system according to claim 1 or 4, wherein in step S4, the Ti plate is placed in a 20% NaOH solution at 30 ℃ for 20min.
  6. 6. An ecological water treatment system according to claim 1 or 5, wherein in step S5, the ecological water is placed in a muffle furnace for reaction for 20min at 300 ℃.
  7. 7. An ecological water treatment system according to claim 1 or 6, wherein in step S6, the ecological water is dried in a drying oven at 60 ℃ for 4 hours.
  8. 8. The ecological water treatment system according to claim 1 or 7, wherein the electrolysis voltage in the step S7 is 9V.
  9. 9. The ecological water treatment system according to claim 1 or 8, wherein the ecological water meeting the standard is obtained after 5 times of circulation in the step S8.

Description

Ecological water treatment system Technical Field The invention relates to ecological water treatment, in particular to an ecological water treatment system for treating ecological water by an electrodialysis method and an electrolysis method. Background Due to the development of social economy, the demand of human beings for clean water is continuously increased, the existing water source is reasonably utilized, the existing water source is protected from being polluted, and the living and industrial wastewater and sewage recycling are treated, so that the method is not only urgent for urban and rural areas in China, but also is a worldwide problem nowadays. Ecological water is waste water discharged in daily life of residents, and is mainly derived from residential buildings and public buildings, such as houses, institutions, schools, hospitals, shops, public places, industrial enterprise toilets and the like. The pollutants contained in domestic sewage are mainly organic matters (such as proteins, carbohydrates, fat, urea, ammonia nitrogen and the like) and a large number of pathogenic microorganisms (such as parasitic ova, enteroviruses and the like). The organic matters existing in the ecological water are extremely unstable and are easy to be decomposed to generate malodor. Bacteria and pathogens are propagated in large quantities with the organic matter in ecological water as nutrition, which can lead to epidemic spread of infectious diseases. Therefore, the ecological water must be treated before it is discharged. Ecological water treatment can be classified into physical method, biological method and chemical method according to their actions, and can be classified into primary treatment, secondary treatment and tertiary treatment according to the treatment degree. Although the chemical oxidation method is simple to operate, the chemical oxidation method is not very ideal in treatment effect, and is not very well used in industrial application because of high operation cost. For the purpose of improving the treatment effect and reducing the running cost at the same time, other oxidation technologies have been developed. The combination of electrochemical oxidation and electrodialysis has excellent degradation effect on ecological water treatment. Disclosure of Invention Aiming at the problems, the modified CMC film is used for modifying the water-soluble carboxymethyl cellulose film into a hydrophobic cation exchange film, and the Ti/SnO 2-G/PbO2 electrode is used as an anode of an electrolytic cell, and the electrode has higher corrosion resistance and oxidation resistance, higher oxygen evolution overpotential and better electrocatalytic activity. The preparation process is simple and convenient to operate, and the current efficiency for degrading organic pollutants is further improved by using the modified CMC film prepared by the preparation method and the Ti/SnO 2-G/PbO2 electrode as the anode. The preparation method comprises the following specific steps: s1, pretreatment of water, namely adding an aluminum chloride coagulant aid into a pool for storing ecological water, enabling the pH value of the ecological water to be 7.0-8.0, reacting the ecological water to generate floccules, separating to obtain ecological water filtrate, adding a sodium polyacrylate flocculant into the ecological water filtrate, and carrying out solid-liquid separation to obtain ecological water filtering supernatant; S2, preparing a modified carboxymethyl cellulose (CMC) film, namely taking 5 g/L-30 g/L of carboxymethyl cellulose (CMC) aqueous solution, adding 1-4 ml of absolute ethyl alcohol as a reinforcing agent, taking 1-2 ml of ethylene glycol as a plasticizer, stirring to obtain semitransparent and particle-free colloid, carrying out vacuum defoaming, coating the colloid on a smooth clean glass plate, naturally airing at room temperature, crosslinking for 10 min-15 min by using a mixed solution of CrCl 3 and FeCl 3 with the mass fraction of 7.0% -9.0%, washing out Cr 3+ and Fe 3+ on the surface by using distilled water, naturally airing and stripping, wherein the carboxymethyl cellulose modified by using CrCl 3 and FeCl 3 can be modified into a hydrophobic cation exchange film, and the modified carboxymethyl cellulose film has small swelling rate in acidic and neutral media due to the synergistic effect between Cr 3+ and Fe 3+ and can stably exist in the acidic and neutral media. S3, carrying out an electrodialysis method in an electrodialysis device, wherein both anode and cathode electrodes are flat graphite electrodes, catholyte is 1 mol/L-5 mol/L H 2SO4, and anolyte is ecological water. The two tanks are separated by the modified CMC film prepared in the step S1, and the current density is 30mA/cm 2; S4, preprocessing the Ti plate, namely placing the Ti plate in a 20% NaOH solution at the temperature of 30 ℃ for 15-25 min, then flushing the Ti plate with deionized water, then placing the Ti plate in absolu