CN114477629B - System and method for treating sticky flushing wastewater - Google Patents

System and method for treating sticky flushing wastewater Download PDF

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CN114477629B
CN114477629B CN202210071067.9A CN202210071067A CN114477629B CN 114477629 B CN114477629 B CN 114477629B CN 202210071067 A CN202210071067 A CN 202210071067A CN 114477629 B CN114477629 B CN 114477629B
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tank
demulsification
wastewater
ozone
treatment
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CN114477629A (en
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吴飞
谈帅
韩笑
陈梦雪
陈枫
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Nanjing Gaoke Environmental Technology Co ltd
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    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • 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
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • 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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • 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
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • 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)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The invention discloses a treatment system and a treatment method for adhesive flushing wastewater, wherein the method specifically comprises the following steps: (1) Introducing the wastewater into an adjusting tank to perform balanced adjustment on water quality and water quantity; (2) Stably introducing the wastewater regulated by the regulating tank into a demulsification tank, adding a demulsifier into the demulsification tank for demulsification reaction, and adding a flocculation precipitant into the demulsification tank after the demulsification reaction to accelerate liquid layering; (3) Demulsification, flocculation and precipitation are carried out to obtain layered liquid, and the upper liquid is introduced into an aerobic tank for aerobic treatment; (4) Introducing the wastewater after aerobic treatment into an ozone pond, filling ozone catalytic filler in the ozone pond, and discharging the water body after treatment of the ozone pond up to the standard.

Description

System and method for treating sticky flushing wastewater
Technical Field
The invention relates to a treatment system of adhesive flushing wastewater and a treatment method of the treatment system.
Background
The paint is manufactured into a finished product and then stored in a tank body, and then the finished product is moved into a tank truck tank for transportation. Because the paint has certain viscosity, the wall surface of the stored tank is stuck with a certain amount of paint finished product, when the tank body is washed by water, a washing wastewater is formed, the wastewater is milky, the solid content is very high, the environmental pollution is serious, and the main pollutants are COD and NH 3 -N and SS, etc. Because the wastewater has high solid content, large pollutant amount and poor fluidity, the current treatment method similar to the wastewater generally adopts a coagulation-anaerobic-aerobic method, and the process comprises the following steps: the device comprises an adjusting tank, a coagulating sedimentation tank, an anaerobic hydrolysis tank, a facultative tank, a primary aerobic contact oxidation tank, a secondary aerobic contact oxidation tank, a sedimentation tank, a filtering tank and the like, and the device has the problems of complex working procedures, more control conditions, long treatment time, more influence factors of system operation and unstable treatment effect.
Disclosure of Invention
The invention aims to: the invention aims at providing a treatment system of the adhesive flushing wastewater, which has the advantages of simple working procedure, short treatment time and good treatment effect.
The technical scheme is as follows: the invention relates to a treatment system for sticky flushing wastewater, which sequentially comprises an adjusting tank, a demulsification tank, an aerobic tank and an ozone tank.
The method for treating the adhesive flushing wastewater by the treatment system comprises the following steps:
(1) Introducing the wastewater into an adjusting tank to perform balanced adjustment on water quality and water quantity;
(2) Stably introducing the wastewater regulated by the regulating tank into a demulsification tank, adding a demulsifier into the demulsification tank for demulsification reaction, and adding a flocculation precipitant into the demulsification tank after the demulsification reaction to accelerate liquid layering;
(3) Demulsification, flocculation and precipitation are carried out to obtain layered liquid, and the upper liquid is introduced into an aerobic tank for aerobic treatment; the purpose of the aerobic reaction is to decompose organic substances by utilizing aerobic microorganisms, thereby removing COD in the wastewater;
(4) Introducing the wastewater after aerobic treatment into an ozone pond, filling ozone catalytic filler in the ozone pond, and discharging the water body after treatment of the ozone pond up to the standard.
Wherein, in the step (1), the hydraulic retention time in the regulating tank is 15-30 min, and the temperature is 30-35 ℃. The hydraulic retention time is determined based on the quantity of water, and the hydraulic retention time is 15-30 min when the volume is small; the activity and the reproduction effect of the subsequent microorganisms can be ensured by keeping the temperature;
in the step (2), the demulsifier is prepared by mixing polymeric ferric chloride (inorganic substance of polymeric ferric salt) with propionic acid or malonic acid, and ethylene glycol or glycerol according to a mass ratio of 4:4:2, namely polymeric ferric chloride: propionic acid or malonic acid: the mixing mass ratio of the ethylene glycol or the glycerol is 4:4:2.
Wherein in the step (2), the adding amount of the demulsifier is 0.9-1.2% of the mass of the wastewater, and the reaction pH is 5.0-6.0; the demulsification time is 5-10 min.
Wherein in the step (2), a flocculating and precipitating agent is added after demulsification reaction, the flocculating and precipitating agent is PAM, the adding amount of the flocculating and precipitating agent is 0.001-0.003% of the mass of the wastewater, the reaction pH is 7.5-8.5, and the precipitating time is 4-8 h.
Wherein in the step (3), the dissolved oxygen is 3-5 mg/L, the temperature is 35-38 ℃ and the hydraulic retention time is 6-10 h during the aerobic treatment.
In the step (4), the ozone deep oxidation treatment time is 1-2 h, and the filling amount of the ozone catalytic filler is 40-60% of the volume of the tank body.
Wherein in the step (4), the ozone catalytic filler is formed by extrusion molding of ceramic materials, iron powder, nickel powder, manganese powder and aluminum oxide through a special ball forming machine (similar to a grinding tool), and finally sintering at a high temperature (the temperature is 400-500 ℃), wherein the diameter of the prepared filler is 2-3 cm, and the specific surface area is more than or equal to 350m 2 /g。O 3 Production of O under catalysis of ozone catalytic packing 3 The free radicals, O free radicals, OH free radicals and other strong oxidation free radicals can strongly oxidize some heterocyclic rings or macromolecular chain pollutants in the wastewater to open the rings and break the chains into small productsThe molecular pollutants are favorable for subsequent biochemical treatment, the biodegradability of the molecular pollutants is improved, and meanwhile, the small molecular pollutants can be continuously oxidized, so that the pollutant removal efficiency is improved.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that: (1) The treatment system has simple procedures, and only needs an adjusting tank, a demulsification coagulation sedimentation tank, an aerobic tank and an ozone deep oxidation tank; (2) The treatment time of the treatment method is short, in the existing adhesive wastewater treatment process, the treatment time of the anaerobic tank, the primary contact oxidation tank and the secondary contact oxidation tank is more than 24 hours, the treatment time of the regulating tank is 15-30 min, the demulsification and precipitation treatment time is 4-8 hours, the aerobic treatment time is 6-10 hours, the ozone deep oxidation treatment time is 1-2 hours, and the wastewater treatment time is greatly shortened; (3) The treatment method has good treatment effect, and after the treatment method is used for treatment, the COD removal rate reaches 96.5 to 98.6 percent, and the NH is removed 3 The removal rate of the N reaches 97.1% -99.0%, the removal rate of the SS reaches 99.9%, and the treated effluent index stably accords with the first-level discharge standard in GB8978-1996 comprehensive wastewater discharge standard.
Drawings
FIG. 1 is a system schematic diagram of a processing system of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
Example 1
The invention relates to a treatment method of adhesive flushing wastewater, which comprises the following steps:
(1) The wastewater enters an adjusting tank, the hydraulic retention time is 30min, and the temperature in the tank body is 30 ℃;
(2) The wastewater subjected to balanced adjustment of water quantity and water quality enters a demulsification pond, and demulsification reaction is carried out in the demulsification pond, wherein the adding amount of the demulsifier is 0.9% of the mass of the wastewater, the reaction pH is controlled at 5.0, and the reaction time is controlled at 5min; adding a flocculating precipitant after demulsification reaction, wherein the PAM addition amount is 0.001% of the wastewater mass, the reaction pH is controlled at 7.5, and the precipitation time is controlled at 4 hours;
(3) Introducing the upper liquid into an aerobic tank, controlling the dissolved oxygen in the aerobic tank to be 3mg/L, controlling the temperature to be 35 ℃ and controlling the hydraulic retention time to be 6 hours;
(4) And (3) ozone deep treatment: and (3) introducing the wastewater subjected to the aerobic treatment into an ozone pool for treatment, wherein the filling amount of ozone catalytic filler in the ozone pool is 40%, and the ozone reaction time is controlled to be 1h.
Example 2
The invention relates to a treatment method of adhesive flushing wastewater, which comprises the following steps:
(1) The wastewater enters an adjusting tank, the hydraulic retention time is 30min, and the temperature in the tank body is 35 ℃;
(2) The wastewater subjected to balanced adjustment of water quantity and water quality enters a demulsification pond, and demulsification reaction is carried out in the demulsification pond, wherein the adding amount of the demulsifier is 0.9% of the mass of the wastewater, the reaction pH is controlled at 5.0, and the reaction time is controlled at 5min; adding a flocculating precipitant after demulsification reaction, wherein the PAM addition amount is 0.001% of the wastewater mass, the reaction pH is controlled at 7.5, and the precipitation time is controlled at 4 hours;
(3) Introducing the upper liquid into an aerobic tank, controlling the dissolved oxygen in the aerobic tank to be 5mg/L, controlling the temperature to be 38 ℃, and controlling the hydraulic retention time to be 10 hours;
(4) And (3) ozone deep treatment: and (3) introducing the wastewater subjected to the aerobic treatment into an ozone pool for treatment, wherein the filling amount of ozone catalytic filler in the ozone pool is 40%, and the ozone reaction time is controlled to be 2 hours.
Example 3
The invention relates to a treatment method of adhesive flushing wastewater, which comprises the following steps:
(1) The wastewater enters an adjusting tank, the hydraulic retention time is 30min, and the temperature in the tank body is 35 ℃;
(2) The wastewater subjected to balanced adjustment of water quantity and water quality enters a demulsification pond, and demulsification reaction is carried out in the demulsification pond, wherein the adding amount of the demulsifier is 1.2% of the mass of the wastewater, the reaction pH is controlled at 6.0, and the reaction time is controlled at 10min; adding a flocculating precipitant after demulsification reaction, wherein the PAM addition amount is 0.003% of the wastewater mass, the reaction pH is controlled at 8.5, and the precipitation time is controlled at 8 hours;
(3) Introducing the upper liquid into an aerobic tank, controlling the dissolved oxygen in the aerobic tank to be 5mg/L, controlling the temperature to be 38 ℃, and controlling the hydraulic retention time to be 10 hours;
(4) And (3) ozone deep treatment: and (3) introducing the wastewater subjected to the aerobic treatment into an ozone pool for treatment, wherein the filling amount of ozone catalytic filler in the ozone pool is 40%, and the ozone reaction time is controlled to be 2 hours.
Example 4
The invention relates to a treatment method of adhesive flushing wastewater, which comprises the following steps:
(1) The wastewater enters an adjusting tank, the hydraulic retention time is 30min, and the temperature in the tank body is 35 ℃;
(2) The wastewater subjected to balanced adjustment of water quantity and water quality enters a demulsification pond, and demulsification reaction is carried out in the demulsification pond, wherein the adding amount of the demulsifier is 1.2% of the mass of the wastewater, the reaction pH is controlled at 6.0, and the reaction time is controlled at 10min; adding a flocculating precipitant after demulsification reaction, wherein the PAM addition amount is 0.003% of the wastewater mass, the reaction pH is controlled at 8.5, and the precipitation time is controlled at 8 hours;
(3) Introducing the upper liquid into an aerobic tank, controlling the dissolved oxygen in the aerobic tank to be 5mg/L, controlling the temperature to be 38 ℃, and controlling the hydraulic retention time to be 10 hours;
(4) And (3) ozone deep treatment: and (3) introducing the wastewater subjected to the aerobic treatment into an ozone pool for treatment, wherein the filling amount of ozone catalytic filler in the ozone pool is 60%, and the ozone reaction time is controlled to be 2 hours.
Taking a flushing wastewater stock solution of a paint finished product adhered to the wall surface of a storage tank as an example. By adopting a related standard detection method, the pH value of the flushing wastewater adopted in the test is 7.2, the SS is 37000 mg/L, the CODCr is 3392mg/L and the NH is detected 3 N is 462.1mg/L.
The above-mentioned flushing wastewater was treated by the treatment methods of examples 1 to 4 and the treatment method of the conventional gum wastewater (mentioned in the background art), respectively, and the results after the treatment are shown in Table 1.
Table 1 shows the effect of removing contaminants in each treatment process
Figure BDA0003482102530000041
As can be seen from Table 1, the method of the present invention was used to flush the adhesive wasteThe water treatment effect is obvious, the COD removal rate reaches 96.5 to 98.6 percent, and the NH is achieved 3 The removal rate of the-N reaches 97.1 to 99.0 percent, and the removal rate of the SS reaches 99.9 percent. The treated effluent index stably accords with the first-level discharge standard in GB8978-1996 Integrated wastewater discharge Standard. As can be seen from comparison of the results of examples 1-4, the increase of the amount of the demulsifier agent and the increase of the amount of the ozone catalytic filler can improve the removal efficiency of COD of the system.
The effect (whether the demulsification is complete or not, and the COD content of the supernatant fluid after the complete demulsification) of the adhesive flushing wastewater treated by the ionic demulsifier and the demulsifier is analyzed, and the results are shown in Table 2:
TABLE 2
Type/amount of medicament 1％ 2％ 3％
Demulsifier of the invention 326 / /
Two-type ionic demulsifier Not demulsified completely Not demulsified completely 521
Anionic inorganic demulsifier Not demulsified completely Not demulsified completely 786
As can be seen from Table 2, the demulsifier of the present invention was used to treat the viscosity-controlling wastewater by using the two-type ionic demulsifier and the anionic inorganic demulsifier, and the demulsifier of the present invention was able to completely and successfully demulsifie with a dosage of only 1% and the COD content of the supernatant was very low. The dosage required for the demulsification success of the other two demulsifiers is 3 times of that of the demulsifier provided by the invention, and the COD content of the supernatant fluid is higher.
The ozone catalytic filler adopted by the invention is formed by mixing ceramic materials, iron powder, nickel powder, manganese powder and aluminum oxide by a machine, extruding and molding, and finally sintering at high temperature, wherein the diameter of the obtained filler is 2-3 cm, and the specific surface area is more than or equal to 350m 2 And/g. The ozone catalytic filler provided by the invention is loaded with a plurality of active metals, and can well catalyze ozone molecules to generate strong oxidation free radicals at normal temperature, so that the removal rate and efficiency of organic matters in wastewater are greatly improved. Meanwhile, as the filler has large specific surface area, the contact frequency between the strong oxidation free radical molecules generated by ozone molecules and pollutants is improved, and the removal effect of organic pollutants is further improved.
The common catalytic filler in the market and the ozone catalytic filler used in the invention are selected to treat the adhesive flushing wastewater respectively, the effect (COD removal rate) is analyzed, and the COD removal rates under different action times are shown in Table 3:
TABLE 3 Table 3
Filler/drug reaction time 30min 60min 90min
Unused catalytic filler 23.2％ 27.1％ 29.8％
Using common catalytic packings 46.3％ 62.1％ 63.3％
Catalytic packing using the invention 65.6％ 73.8％ 77.0％
As can be seen from Table 3, the use of the ozone catalytic filler of the invention can effectively accelerate the catalytic rate and the catalytic effect, and the removal rate of COD can reach more than 65% only by 30 minutes of ozone catalytic reaction.
NH at different times of action 3 The N removal rate is shown in table 4:
TABLE 4 Table 4
Filler/drug reaction time 30min 60min 90min
Unused catalytic filler 97.2％ 98.6％ 98.8％
Using common catalytic packings 98.8％ 99.0％ 99.0％
Catalytic packing using the invention 99.2％ 99.3％ 99.3％
。

Claims (5)

1. A method for treating adhesive flushing wastewater is characterized by comprising the following steps: comprises an adjusting tank, a demulsification tank, an aerobic tank and an ozone tank in sequence; the method specifically comprises the following steps:
(1) Introducing the wastewater into an adjusting tank to perform balanced adjustment on water quality and water quantity;
(2) Stably introducing the wastewater regulated by the regulating tank into a demulsification tank, adding a demulsifier into the demulsification tank for demulsification reaction, and adding a flocculation precipitant into the demulsification tank after the demulsification reaction to accelerate liquid layering; the demulsifier is prepared by mixing polymeric ferric chloride with propionic acid or malonic acid and ethylene glycol or glycerol according to a mass ratio of 4:4:2; the adding amount of the demulsifier is 0.9% -1.2% of the mass of the wastewater, and the reaction pH is 5.0-6.0; the demulsification time is 5-10 min;
(3) Demulsification, flocculation and precipitation are carried out to obtain layered liquid, and the upper liquid is introduced into an aerobic tank for aerobic treatment;
(4) Introducing the wastewater subjected to the aerobic treatment into an ozone pond, filling ozone catalytic filler in the ozone pond, and discharging the water body after the treatment of the ozone pond after reaching the standard; the ozone catalytic filler is formed by extruding and molding a ceramic material, iron powder, nickel powder, manganese powder and aluminum oxide by a balling machine, and finally sintering at 400-500 ℃, wherein the diameter of the prepared filler is 2-3 cm, and the specific surface area is more than or equal to 350m 2 /g。
2. The method for treating the sticky flushing wastewater according to claim 1, wherein the method comprises the following steps: in the step (1), the hydraulic retention time in the regulating tank is 15-30 min, and the temperature is 30-35 ℃.
3. The method for treating the sticky flushing wastewater according to claim 1, wherein the method comprises the following steps: in the step (2), adding a flocculating and precipitating agent after demulsification reaction, wherein the flocculating and precipitating agent is PAM, the adding amount of the flocculating and precipitating agent is 0.001% -0.003% of the mass of wastewater, the reaction pH is 7.5-8.5, and the precipitating time is 4-8 hours.
4. The method for treating the sticky flushing wastewater according to claim 1, wherein the method comprises the following steps: in the step (3), during aerobic treatment, the dissolved oxygen is 3-5 mg/L, the temperature is 35-38 ℃, and the hydraulic retention time is 6-10 h.
5. The method for treating the sticky flushing wastewater according to claim 1, wherein the method comprises the following steps: in the step (4), the filling amount of the ozone catalytic filler is 40% -60% of the volume of the tank body.
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