CN111646616B - Hydrodynamic cavitation treatment process for high-concentration organic wastewater - Google Patents

Hydrodynamic cavitation treatment process for high-concentration organic wastewater Download PDF

Info

Publication number
CN111646616B
CN111646616B CN202010615600.4A CN202010615600A CN111646616B CN 111646616 B CN111646616 B CN 111646616B CN 202010615600 A CN202010615600 A CN 202010615600A CN 111646616 B CN111646616 B CN 111646616B
Authority
CN
China
Prior art keywords
organic wastewater
treatment
mixed liquor
sedimentation
fenton reaction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010615600.4A
Other languages
Chinese (zh)
Other versions
CN111646616A (en
Inventor
吴仲达
祝瓛冰
李冬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Source Control Environmental Protection Technology Co ltd
Original Assignee
Guangdong Source Control Environmental Protection Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Source Control Environmental Protection Technology Co ltd filed Critical Guangdong Source Control Environmental Protection Technology Co ltd
Priority to CN202010615600.4A priority Critical patent/CN111646616B/en
Publication of CN111646616A publication Critical patent/CN111646616A/en
Application granted granted Critical
Publication of CN111646616B publication Critical patent/CN111646616B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46176—Galvanic cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention relates to the technical field of organic wastewater treatment, in particular to a hydrodynamic cavitation treatment process for high-concentration organic wastewater, which comprises the following steps: (1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater; (2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, and adding activated carbon and a flocculating agent for flocculation sedimentation to obtain a supernatant and activated sludge mixed solution; (3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor in ultrasonic cavitation equipment to obtain a return sludge mixed liquor; (4) fenton reaction: carrying out Fenton reaction treatment on the supernatant and the return sludge mixed liquor in a Fenton reaction tank to obtain an oxidized water body; (5) and (3) secondary sedimentation tank sedimentation: and (4) introducing the oxidized water body into a secondary sedimentation tank for sedimentation treatment to obtain the purified water body. The invention replaces biological treatment with hydrodynamic cavitation, combines with chemical treatment, reduces the production of sludge difficult to degrade and reduces the treatment cost.

Description

Hydrodynamic cavitation treatment process for high-concentration organic wastewater
Technical Field
The invention relates to the technical field of organic wastewater treatment, in particular to a hydrodynamic cavitation treatment process for high-concentration organic wastewater.
Background
With the rapid development of the chemical industry in China, a large amount of organic pollutants are generated in the chemical industry in the production process, and enter a water body through various ways, so that the water environment quality is deteriorated, and the life safety of human beings is threatened.
The wastewater treatment method can be classified into a physical method, a chemical method, a physicochemical method and a biological method in terms of the principle of action. The domestic wastewater, such as urban domestic wastewater, is treated by conventional physical, chemical and biological methods. The organic waste water which is harmful to biology or is high in concentration and difficult to biodegrade is not suitable for being directly treated by a biological method, and usually needs to be treated by a combustion method and a chemical complete oxidation method or is pretreated by a chemical method and then treated by a biochemical method, so that most of waste water treatment with simple components, good biodegradation performance and low concentration can be well finished, namely a chemical and biological combined treatment process, and the waste water is discharged or recycled after being treated and reaching the standard. The most common biochemical method is the activated sludge method, which can decompose some macromolecular organic matters which are difficult to decompose into micromolecular organic matters under the action of bacterial exoenzyme, but the bacterial micelles in the sludge components are more and more, the sludge continuously grows until the backflow treatment can not be carried out, and the treatment cost of the residual sludge is higher, which is not beneficial to the cost reduction of purified water.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the hydrodynamic cavitation treatment process for the high-concentration organic wastewater, which is used for replacing biological treatment by hydrodynamic cavitation and is combined with chemical treatment, so that the generation amount of sludge difficult to degrade is reduced, and the treatment cost is reduced.
The purpose of the invention is realized by the following technical scheme:
a hydrodynamic cavitation process for treating high-concentration organic wastewater comprises the following steps:
(1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: and (5) introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment, and obtaining the purified water body.
According to the invention, firstly, organic matters in the organic wastewater are preliminarily oxidized through a micro-electrolysis reaction, the COD value of the organic wastewater is reduced, and the amount of precipitated sludge generated by coagulating sedimentation is reduced, so that the treatment pressure of hydrodynamic cavitation is reduced; then adding activated carbon and a flocculating agent to carry out flocculation precipitation in the process of coagulating precipitation, wherein the activated carbon can be flocculated by the flocculating agent and adsorb colloid to form precipitate, and can be used for cooperating with subsequent hydrodynamic cavitation to improve the degradation effect of organic matters; then, the hydrodynamic cavitation only treats the activated sludge mixed liquid generated by the coagulating sedimentation, which can improve the contact efficiency of the precipitated colloid and the cavitation bubbles, thereby improving the degradation effect, improving the treatment efficiency of the hydrodynamic cavitation, and solving the problem that the treatment efficiency of the hydrodynamic cavitation can not follow the treatment efficiency of micro-electrolysis or Fenton reaction aiming at the whole water body treatment efficiency, thereby realizing the industrial application of the ultrasonic hydrodynamic cavitation in water purification treatment; finally, the invention carries out Fenton reaction treatment on the returned sludge mixed liquor after the hydrodynamic cavitation treatment and the supernatant obtained by coagulating sedimentation, and utilizes the strong oxidizing property of hydroxyl free radicals to non-selectively oxidize and decompose organic matters which are difficult to be biochemically degraded in the wastewater into small molecular compounds, thereby leading the supernatant after the sedimentation in the secondary sedimentation tank to reach the corresponding discharge standard.
In the micro-electrolysis in the step (1), the pH value of the organic wastewater is adjusted to 2-4, the iron-carbon ratio of the micro-electrolysis reaction treatment is 1-2:1, and the micro-electrolysis reaction treatment time is 2-3 h. Little electrolysis reaction can carry out preliminary degradation to organic waste water through redox, and through the parameter setting of control little electrolysis, can improve the efficiency of getting rid of COD, COD gets rid of efficiency and can reach 58%.
Wherein, in the coagulating sedimentation in the step (2), the input amount of the active carbon per ton of the organic wastewater is 200 g. In the step (2), the activated carbon plays a role of flocculation and precipitation, but due to the property of the porous high specific surface of the activated carbon, the activated carbon can promote more cavitation bubbles to be generated in the hydrodynamic cavitation process, so that the degradation efficiency is improved. More preferably, the activated carbon is powdered activated carbon, the proportion of the activated carbon passing through a 200-mesh sieve is 98 percent, and the specific surface area is 1400-1600m2/g。
In the coagulating sedimentation in the step (2), the input amount of the flocculating agent per ton of organic wastewater is 40-60g, and the flocculating agent consists of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 1-2: 1. The flocculant selected by the invention can strongly adsorb colloid particles, the colloid is condensed through adsorption, bridge frame and crosslinking, and the formed colloid is easy to crack in hydrodynamic cavitation, thereby being beneficial to the light weight of the activated sludge.
Wherein, in the hydrodynamic cavitation of the step (3), the frequency of ultrasonic vibration is 20-30kHz, the sound energy flux density is 0.22-0.33w/mL, and the processing time of ultrasonic vibration is 30-50 min. The specific action process of ultrasonic hydrodynamic cavitation is quite complicated, generally thought to be through the burst of cavitation bubble produce instantaneous local high temperature and high pressure and carry out mechanical crushing to aquatic organic matter, and the hydroxyl free radical that high temperature high pressure produced also can play the degradation effect to the organic matter simultaneously to through alling oneself with active carbon, can promote degradation efficiency more showing, improve the COD clearance. In addition, the degradation efficiency of the sludge is further improved and the cost of sludge treatment is reduced by controlling the parameters of ultrasonic output.
Wherein, in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 3-5: 10. By controlling the flow ratio of the returned sludge mixed liquor to the supernatant, the hydrodynamic cavitation efficiency can be matched with the Fenton reaction treatment efficiency, so that the treatment cost is reduced and the treatment efficiency is improved.
In the Fenton reaction in the step (4), the input amount of ferrous sulfate per ton of organic wastewater is 1-2kg, the input amount of hydrogen peroxide is 6-10L, the mass concentration of the hydrogen peroxide is 25-35%, and the Fenton reaction time is 2-4 h. By optimizing the parameter setting of the Fenton reaction and combining the combination of the hydrodynamic cavitation, the organic matters of the organic wastewater can be basically removed, so that the secondary sedimentation tank reaches the corresponding discharge standard after sedimentation.
In the secondary sedimentation tank sedimentation in the step (5), the activated sludge separated in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 1-2: 10. Although biochemical aerobic treatment is not adopted, the invention still can not avoid the generation of a small amount of activated sludge, but has less yield, can carry out reflux treatment with the reflux sludge mixed liquor, and basically does not influence the water purification effect.
The invention has the beneficial effects that: according to the invention, firstly, organic matters in the organic wastewater are preliminarily oxidized through a micro-electrolysis reaction, the COD value of the organic wastewater is reduced, and the amount of precipitated sludge generated by coagulating sedimentation is reduced, so that the treatment pressure of hydrodynamic cavitation is reduced; then adding activated carbon and a flocculating agent to carry out flocculation precipitation in the process of coagulating precipitation, wherein the activated carbon can be flocculated by the flocculating agent and adsorb colloid to form precipitate, and can be used for cooperating with subsequent hydrodynamic cavitation to improve the degradation effect of organic matters; then, the hydrodynamic cavitation only treats the activated sludge mixed liquid generated by the coagulating sedimentation, which can improve the contact efficiency of the precipitated colloid and the cavitation bubbles, thereby improving the degradation effect, improving the treatment efficiency of the hydrodynamic cavitation, and solving the problem that the treatment efficiency of the hydrodynamic cavitation can not follow the treatment efficiency of micro-electrolysis or Fenton reaction aiming at the whole water body treatment efficiency, thereby realizing the industrial application of the ultrasonic hydrodynamic cavitation in water purification treatment; finally, the invention carries out Fenton reaction treatment on the returned sludge mixed liquor after the hydrodynamic cavitation treatment and the supernatant obtained by coagulating sedimentation, and utilizes the strong oxidizing property of hydroxyl free radicals to non-selectively oxidize and decompose organic matters which are difficult to be biochemically degraded in the wastewater into small molecular compounds, thereby leading the supernatant after the sedimentation in the secondary sedimentation tank to reach the corresponding discharge standard.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A hydrodynamic cavitation process for treating high-concentration organic wastewater comprises the following steps:
(1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: and (5) introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment, and obtaining the purified water body.
In the micro-electrolysis in the step (1), the pH value of the organic wastewater is adjusted to 3, the iron-carbon ratio of the micro-electrolysis reaction treatment is 1.5:1, and the micro-electrolysis reaction treatment time is 2 hours.
Wherein in the coagulating sedimentation in the step (2), the input amount of the activated carbon is 150g per ton of the organic wastewater. Wherein the activated carbon is powdered activated carbon, the ratio of the activated carbon to the activated carbon after being sieved by a 200-mesh sieve is 98 percent, and the specific surface area is 1500m2/g。
In the coagulating sedimentation in the step (2), the input amount of the flocculating agent per ton of organic wastewater is 50g, and the flocculating agent consists of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 1.5: 1.
Wherein, in the hydrodynamic cavitation of the step (3), the frequency of the ultrasonic vibration is 25kHz, the sound energy flux density is 0.27w/mL, and the processing time of the ultrasonic vibration is 30 min.
Wherein, in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 4: 10.
In the fenton reaction in the step (4), the input amount of ferrous sulfate per ton of organic wastewater is 1.5kg, the input amount of hydrogen peroxide is 8L, the mass concentration of the hydrogen peroxide is 30%, and the fenton reaction time is 2 h.
In the secondary sedimentation tank sedimentation in the step (5), the activated sludge separated in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 1.5: 10.
Example 2
A hydrodynamic cavitation process for treating high-concentration organic wastewater comprises the following steps:
(1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: and (5) introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment, and obtaining the purified water body.
In the step (1), the pH value of the organic wastewater is adjusted to 2, the iron-carbon ratio of the micro-electrolysis reaction treatment is 1:1, and the micro-electrolysis reaction treatment time is 2.5 h.
Wherein, in the coagulating sedimentation in the step (2), the input amount of the active carbon is 100g per ton of the organic wastewater. Wherein the activated carbon is powdered activated carbon, the proportion of the activated carbon passing through a 200-mesh sieve is 98 percent, and the specific surface area is 1400m2/g。
In the coagulating sedimentation in the step (2), the input amount of the flocculating agent per ton of organic wastewater is 40g, and the flocculating agent is composed of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 1: 1.
Wherein, in the hydrodynamic cavitation of the step (3), the frequency of the ultrasonic vibration is 20kHz, the sound energy flux density is 0.22w/mL, and the processing time of the ultrasonic vibration is 50 min.
Wherein, in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 3: 10.
In the fenton reaction in the step (4), the input amount of ferrous sulfate per ton of organic wastewater is 1kg, the input amount of hydrogen peroxide is 6L, the mass concentration of the hydrogen peroxide is 25%, and the fenton reaction time is 4 h.
In the secondary sedimentation tank sedimentation in the step (5), the activated sludge separated in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 1: 10.
Example 3
A hydrodynamic cavitation process for treating high-concentration organic wastewater comprises the following steps:
(1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: and (5) introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment, and obtaining the purified water body.
In the step (1), the pH value of the organic wastewater is adjusted to 4, the iron-carbon ratio of the micro-electrolysis reaction treatment is 2:1, and the micro-electrolysis reaction treatment time is 3 h.
Wherein in the coagulating sedimentation in the step (2), the input amount of the activated carbon is 200g per ton of the organic wastewater. Wherein the activated carbon is powdered activated carbon, the ratio of the activated carbon to the activated carbon after being sieved by a 200-mesh sieve is 98 percent, and the specific surface area is 1600m2/g。
In the coagulating sedimentation in the step (2), the input amount of the flocculating agent per ton of organic wastewater is 60g, and the flocculating agent is composed of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 2: 1.
Wherein, in the hydrodynamic cavitation of the step (3), the frequency of the ultrasonic vibration is 30kHz, the sound energy flux density is 0.33w/mL, and the processing time of the ultrasonic vibration is 40 min.
Wherein, in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 4: 10.
In the fenton reaction in the step (4), the input amount of ferrous sulfate per ton of organic wastewater is 2kg, the input amount of hydrogen peroxide is 10L, the mass concentration of the hydrogen peroxide is 35%, and the fenton reaction time is 3 h.
In the secondary sedimentation tank sedimentation in the step (5), the activated sludge separated in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 2: 10.
Comparative example 1
This comparative example differs from example 1 in that: and (3) adding activated carbon into the coagulating sedimentation in the step (2), and only adding a flocculating agent for flocculating sedimentation.
Comparative example 2
A hydrodynamic cavitation process for treating high-concentration organic wastewater comprises the following steps:
(1) adjusting the pH value of the organic wastewater to 3;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: and (5) introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment, and obtaining the purified water body.
Wherein in the coagulating sedimentation in the step (2), the input amount of the activated carbon is 150g per ton of the organic wastewater. Wherein the activated carbon is powdered activated carbon, the ratio of the activated carbon to the activated carbon after being sieved by a 200-mesh sieve is 98 percent, and the specific surface area is 1500m2/g。
In the coagulating sedimentation in the step (2), the input amount of the flocculating agent per ton of organic wastewater is 50g, and the flocculating agent consists of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 1.5: 1.
Wherein, in the hydrodynamic cavitation of the step (3), the frequency of the ultrasonic vibration is 25kHz, the sound energy flux density is 0.27w/mL, and the processing time of the ultrasonic vibration is 50 min.
Wherein, in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 4: 10.
In the fenton reaction in the step (4), the input amount of ferrous sulfate per ton of organic wastewater is 1.5kg, the input amount of hydrogen peroxide is 8L, the mass concentration of the hydrogen peroxide is 30%, and the fenton reaction time is 2 h.
In the secondary sedimentation tank sedimentation in the step (5), the activated sludge separated in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 1.5: 10.
Dividing the high-concentration organic wastewater of the same batch into 3 groups, wherein 1 group is an experimental group and is treated by adopting the treatment process of the embodiment 1; the other two groups are comparison groups, and the treatment processes of comparative example 1 and comparative example 2 are respectively adopted for treatment, and the treatment effects are shown in the following table:
COD(mg/L) BOD5(mg/L)
before treatment 19064 4358
Example 1 96 19.2
Comparative example 1 5134 962
Comparative example 2 3817 639
The wastewater treated by the method 1 can reach the discharge standard, which shows that the method has higher purification efficiency, generates less sludge and can effectively reduce the treatment cost; as can be seen from the comparison between example 1 and comparative example 1, in the degradation process, the combination of the activated carbon and the ultrasonic cavitation plays an indispensable role, and even if the degradation degree is compensated by prolonging the time of the ultrasonic cavitation, the problem of too low efficiency of the ultrasonic cavitation is caused; as can be seen from the comparison between the example 1 and the comparative example 2, the micro-electrolysis is also a vital combination technology for pretreating the water body, and even if the ultrasonic cavitation time is prolonged, the water body cannot reach the discharge standard, because the non-micro-electrolysis water body generates more colloidal precipitates after flocculation, the supernatant has a higher COD value, the colloidal precipitates cannot be efficiently treated by ultrasonic cavitation, and the supernatant cannot be completely reduced to the discharge standard once through Fenton reaction.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.

Claims (4)

1. A hydrodynamic cavitation process for treating high-concentration organic wastewater is characterized by comprising the following steps: the method comprises the following steps:
(1) micro-electrolysis: adjusting the pH value of the organic wastewater, and then carrying out micro-electrolysis reaction treatment on the organic wastewater;
(2) coagulating sedimentation: introducing the organic wastewater into a coagulating sedimentation tank, adding activated carbon and a flocculating agent for flocculating sedimentation, obtaining supernatant from a supernatant outlet of the coagulating sedimentation tank, and obtaining activated sludge mixed liquor from a sludge discharge port of the coagulating sedimentation tank;
(3) hydrodynamic cavitation: carrying out ultrasonic cavitation treatment on the activated sludge mixed liquor obtained in the step (2) in ultrasonic cavitation equipment to obtain a return sludge mixed liquor;
(4) fenton reaction: carrying out Fenton reaction treatment on the supernatant obtained in the step (2) and the return sludge mixed liquor obtained in the step (3) in a Fenton reaction tank to obtain an oxidized water body;
(5) and (3) secondary sedimentation tank sedimentation: introducing the oxidized water body obtained in the step (4) into a secondary sedimentation tank for sedimentation treatment to obtain a purified water body;
in the micro-electrolysis in the step (1), the pH value of the organic wastewater is adjusted to 2-4, the iron-carbon ratio of the micro-electrolysis reaction treatment is 1-2:1, and the micro-electrolysis reaction treatment time is 2-3 h;
wherein in the coagulating sedimentation in the step (2), the input amount of the active carbon in each ton of the organic wastewater is 200 g;
in the coagulating sedimentation in the step (2), the input amount of the flocculating agent for each ton of organic wastewater is 40-60g, and the flocculating agent consists of polyaluminum ferric chloride and polyacrylamide according to the weight ratio of 1-2: 1;
wherein, in the hydrodynamic cavitation of the step (3), the frequency of ultrasonic vibration is 20-30kHz, the sound energy flux density is 0.22-0.33w/mL, and the processing time of ultrasonic vibration is 30-50 min.
2. The hydrodynamic cavitation process of high concentration organic wastewater as claimed in claim 1, wherein: in the Fenton reaction in the step (4), the flow ratio of the returned sludge mixed liquor to the supernatant is 3-5: 10.
3. The hydrodynamic cavitation process of high concentration organic wastewater as claimed in claim 1, wherein: in the Fenton reaction in the step (4), the input amount of ferrous sulfate of each ton of organic wastewater is 1-2kg, the input amount of hydrogen peroxide is 6-10L, the mass concentration of the hydrogen peroxide is 25-35%, and the Fenton reaction time is 2-4 h.
4. The hydrodynamic cavitation process of high concentration organic wastewater as claimed in claim 1, wherein: and (5) in the secondary sedimentation tank sedimentation in the step (5), the activated sludge obtained by separation in the secondary sedimentation tank and the return sludge mixed liquor flow back to the Fenton reaction tank together, and the flow ratio of the activated sludge to the return sludge mixed liquor is 1-2: 10.
CN202010615600.4A 2020-06-30 2020-06-30 Hydrodynamic cavitation treatment process for high-concentration organic wastewater Active CN111646616B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010615600.4A CN111646616B (en) 2020-06-30 2020-06-30 Hydrodynamic cavitation treatment process for high-concentration organic wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010615600.4A CN111646616B (en) 2020-06-30 2020-06-30 Hydrodynamic cavitation treatment process for high-concentration organic wastewater

Publications (2)

Publication Number Publication Date
CN111646616A CN111646616A (en) 2020-09-11
CN111646616B true CN111646616B (en) 2021-06-29

Family

ID=72351565

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010615600.4A Active CN111646616B (en) 2020-06-30 2020-06-30 Hydrodynamic cavitation treatment process for high-concentration organic wastewater

Country Status (1)

Country Link
CN (1) CN111646616B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111646655B (en) * 2020-06-30 2021-08-20 广东源控环保科技有限公司 AA/O treatment process for hydrodynamic cavitation mud reduction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102849893B (en) * 2012-08-06 2014-08-13 南京凯盛国际工程有限公司 Treatment method of high-concentration nondegradable organic wastewater
CN103864250B (en) * 2014-03-13 2015-11-25 顾祥茂 A kind for the treatment of process of high concentrated organic wastewater
CN105417894A (en) * 2016-01-05 2016-03-23 宜兴市永创环保科技有限公司 Treatment method for high-concentration wastewater difficult to degrade

Also Published As

Publication number Publication date
CN111646616A (en) 2020-09-11

Similar Documents

Publication Publication Date Title
CN106554126B (en) Deep standard-reaching treatment method and system for reverse osmosis concentrated water
CN102001792B (en) Glyphosate wastewater treatment method
CN102730862B (en) Sewage treatment method in synthetic rubber production
CN106277648A (en) A kind of high salinity waste water processing means and method of wastewater treatment thereof
CN107445392A (en) Organosilicon produces the high-efficient treatment method of waste water
CN102452753A (en) Saliferous organic wastewater treatment method
CN107364998B (en) Treatment process of medium-concentration organic industrial wastewater
CN112794555A (en) Novel method for treating wastewater by reinforced coagulation
CN111646616B (en) Hydrodynamic cavitation treatment process for high-concentration organic wastewater
CN111606519A (en) Advanced treatment method for electroplating wastewater
CN113582439A (en) Iron-carbon Fenton pretreatment method for acidic high-salt high-concentration organic wastewater
CN112047539A (en) Sewage treatment method
CN109704510B (en) Advanced treatment process for biochemical effluent of landfill leachate
CN111423065A (en) Micro-electrolysis Fenton treatment process for printing wastewater
CN113277659B (en) Organochlorine waste water stage treatment and resource recovery system
CN113087289B (en) Treatment method of circuit board development wastewater
CN112028408B (en) Advanced treatment method and system for aromatic and heterocyclic compound wastewater
CN114516689A (en) Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof
CN111847747A (en) System and method for treating high-salinity high-organic-matter wastewater
CN111807625A (en) Treatment method and treatment system for acrylate pressure-sensitive adhesive wastewater
CN104671596A (en) Sewage treatment device with parallel structures
CN111285554B (en) Method for deep purification treatment of landfill leachate
CN219991338U (en) Full quantization processing system of landfill leachate
CN216191789U (en) RO concentrated water treatment system of chemical industry sewage treatment plant
CN113429059B (en) Internal electrolysis-alkaline hydrolysis-biological integrated treatment process for hexanitrohexaazaisowurtzitane production wastewater

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant