CN114292005A - Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone - Google Patents
Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone Download PDFInfo
- Publication number
- CN114292005A CN114292005A CN202111664362.7A CN202111664362A CN114292005A CN 114292005 A CN114292005 A CN 114292005A CN 202111664362 A CN202111664362 A CN 202111664362A CN 114292005 A CN114292005 A CN 114292005A
- Authority
- CN
- China
- Prior art keywords
- sludge
- air
- concentration
- ozone
- air flotation
- 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.)
- Pending
Links
Images
Abstract
The invention relates to a method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone, which comprises the steps of mixing the sludge with an air flotation concentration medicament, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles by ozone through a micro-nano bubble generating unit, and then feeding the generated micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump to uniformly mix the sludge, the air flotation concentration medicament and the high-concentration ozone; pumping the mixed solution into an air floatation contact chamber, and opening a slag scraping plate to remove floating concentrated sludge after air floatation; the concentrated sludge floats upwards completely, is removed by the slag scraping plate and then is led out through a sludge outlet, and the sludge supernatant after air floatation is disinfected and then is discharged as bottom effluent through a concentrated effluent guide pipe. According to the invention, on the premise of greatly reducing the ozone consumption, the water content of the concentrated sludge is quickly increased to 90-92%, the air flotation concentration efficiency is greatly improved, most of antibiotic pollutants and pathogenic bacteria in the supernatant are removed, the chromaticity of the supernatant is reduced, and the sludge reduction and harmlessness are obviously enhanced.
Description
Technical Field
The invention relates to the field of sludge reduction and harmless treatment, in particular to a method and a system for strengthening sludge air flotation concentration reduction and harmless treatment by using high-concentration ozone.
Background
In the sewage treatment industry, the conventional activated sludge process is the most widely used sewage treatment process, but produces a large amount of sludge. The sludge has high water content and complex components, contains heavy metals, pathogens, persistent organic pollutants and the like, and can threaten the environmental safety and human health. The general sludge treatment refers to the process of sludge reduction, stabilization and harmlessness through concentration, digestion, dehydration, composting, drying and other processes. When the sludge is subjected to subsequent treatment and disposal, the sludge needs to be concentrated firstly so as to remove part of water, reduce the volume of the sludge, reduce the conformity of subsequent transportation and treatment and disposal, reduce the volume of treatment equipment and reduce the treatment and disposal cost.
In addition, with the concern of biomass energy recovery and utilization, the kitchen and sludge combined anaerobic digestion technology is increasingly widely applied. In the existing combined anaerobic digestion engineering, the designed water content of an anaerobic digestion tank is generally between 90% and 92% so as to ensure that a system can be fully stirred under the condition of certain volume load. The requirement on the water content of the feed of the mixture of the kitchen and the sludge is provided, and the water content of the sludge is generally 90-92%, so that the water content of the sludge is better in the range when the sludge is mixed with the kitchen. However, the current sludge concentration technology is generally designed to reduce the water content of the sludge to 95-96%, and the sludge dehydration technology is designed to reduce the water content of the sludge to 80% or below, so that the existing concentrated sludge or dehydrated sludge is difficult to directly meet the requirement of the cooperative anaerobic digestion under the condition of not additionally adjusting the water content (the process complexity and cost are increased), and therefore a new sludge concentration technology needs to be developed, and the water content of the sludge can be directly and efficiently reduced to the range of 90-92%.
Patent document CN108178492A discloses municipal domestic sludge air flotation concentration treatment equipment and method, wherein after Polyacrylamide (PAM) (1.5-2.5 per mill of sludge dry weight) is subjected to simple chemical conditioning, a cavitation air dissolving principle is utilized, an improved cavitation air flotation concentration unit is utilized, air sources are utilized to carry out air flotation concentration on the municipal domestic sludge, the retention time is less than or equal to 9min, and the water content of the discharged sludge is reduced to 95-96%; patent document CN106587447A discloses a system and method for treating water by electrically induced coagulation of ozone gas flotation-catalytic oxidation multi-coupling, wherein the copolymer of amorphous hydroxide-metal ion system and contaminants such as polar macromolecule, colloid, and emulsified oil is formed in water by electric induction, and then ozone in dissolved air water and metal ions in the treated water form O3The Me system promotes the structure of the refractory organic matter to be destroyed, and the uniform micro-bubbles formed by the dissolved air return water system are strongly attached to the surface of the formed copolymerization and complexation system in water and are carried away from the water treatment system by the floating of the micro-bubbles, so that the high-efficiency solid-liquid separation is completed.
However, the above treatment process has the following disadvantages: (1) when the air flotation concentration is conditioned by adopting a chemical agent, the problem of adding a large amount of polyacrylamide and polyaluminium chloride agents still exists, so that a large amount of secondary pollutants are introduced for the subsequent treatment of the sludge; (2) the water content of the obtained concentrated sludge is mostly more than 95%, and the ideal effect of 90-92% of the water content cannot be achieved; (3) when ozone is used as an air source for concentration, a large amount of metal catalysts or other auxiliary catalysis means such as the application of external voltage are needed while a certain amount of ozone is added, secondary pollutants are introduced by adding a large amount of metal catalysts, the application of external voltage and the like increases the air floatation energy consumption and improves the air floatation equipment and operation cost.
Disclosure of Invention
The invention aims to solve the problems of low sludge concentration efficiency, high water content of concentrated sludge, addition of a large amount of concentrated agents, large amount of metal catalysts or external voltage during ozone concentration, and high energy consumption and cost in the prior art, and provides a method and a system for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone.
According to the invention, on the premise of greatly reducing the addition amount of a concentrated medicament and the dosage of a metal catalyst, not applying voltage and saving the dosage of ozone, the water content of the concentrated sludge is increased to 90-92% from more than 95% of the traditional water content, the air flotation concentration efficiency is greatly improved, the concentrated sludge and antibiotic pollutants and pathogenic bacteria in the supernatant are removed in a strengthened manner, the chromaticity of the supernatant is reduced, and the reduction and harmlessness of the sludge are obviously strengthened.
The purpose of the invention is realized by the following technical scheme:
a method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone comprises the following steps:
s1, preparing or preparing an air flotation concentrated medicament;
s2, mixing the sludge and the air flotation concentrated agent in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles by low-dose high-concentration ozone through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentrated agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
s3, pumping the mixed liquid in the pressure container tank into an air floatation contact chamber, carrying out air floatation for 5-10 min, and then opening a slag scraping plate to remove the floating concentrated sludge;
s4, floating the concentrated sludge after air floatation for 30-60 min, removing the sludge by a scraper, leading out the sludge through a sludge outlet, continuing working for 5-10 min, and discharging the supernatant of the sludge after air floatation as bottom effluent through a concentrated effluent guide pipe.
The working principle of the invention is as follows: extracellular polymeric substance of mud contains a large amount of hydrophilic substances, and have the negative charge, it is difficult to separate to lead to adsorbing a large amount of moisture between the mud surface clearance, and because the electrical property is repulsive, be flocculent between the mud, present the suspended state in the liquid, be difficult to the flocculation agglomeration, it is concentrated to have influenced mud to obtain through the air supporting, through ozone as the air supply, on reducing the density of mud granule and come-up, realize the separation of mud granule and water basis, accessible ozone effect further oxidizes the hydrophilic substance in the mud extracellular polymeric substance, destroy its water-holding capacity, neutralize the surface charge of mud under the effect of a small amount of metal catalyst, reach flocculation and the concentration performance that improves mud, improve the mud-water separation effect.
Compared with the traditional ozone concentration (150mg/L), the high-concentration ozone (300-800 mg/L) can greatly improve the destruction capability of ozone on sludge extracellular polymers and the water holding capacity of the sludge extracellular polymers on the premise of the same ozone dosage, and greatly strengthen the destruction of antibiotic pollutants, pathogenic bacteria and the like in the sludge; the high-concentration ozone is combined with a small amount of metal catalyst, so that the damage capability of the ozone on sludge extracellular polymers can be improved by further strengthening the action of the ozone, the neutralization of the sludge surface charges can be improved, and the dosage of the traditional air flotation concentration agent can be greatly reduced; the utilization rate of an ozone source can be improved by the injection mode of micro-nano bubbles, so that the waste of ozone is reduced, the ozone reaction efficiency is improved, the energy consumption is further reduced, and the cost is reduced; the coupling of high concentration ozone, a small amount of metal catalyst, micro-nano bubble injection mode can reduce concentrated medicament addition and metal catalyst quantity by a wide margin, not add external voltage, under the prerequisite of saving ozone quantity, promote the moisture content of concentrated sludge to 90 ~ 92% from traditional more than 95%, improve air supporting concentration efficiency by a wide margin to strengthen getting rid of concentrated sludge and antibiotic class pollutant and pathogenic bacterium in the supernatant, reduce the colourity of supernatant, show the decrement and the innoxious of strengthening mud.
Preferably, the aerosol concentrated medicament in step S1 is obtained by mixing powder A and powder B according to the mass ratio of 5-10: 1, wherein the powder A isIs one or the mixture of polyacrylamide powder or polyaluminium chloride powder; b powder is ferro-manganese spinel (MnFe)2O4) Or birnessite (MnO)2) And (3) powder.
In the invention, the function of adding the metal catalyst is to further strengthen the function of ozone, improve the destructive capacity of the metal catalyst on sludge extracellular polymers and improve the neutralization of the surface charges of the sludge, so that the dosage of the traditional air flotation concentration agent is greatly reduced, the metal catalyst cannot play a role in catalysis when the dosage is too low, the dosage cost of the agent and the risk of introducing a large amount of secondary pollutants into the sludge exist when the dosage is too high, and the invention controls that when a high-concentration ozone (300-800 mg/L) gas source is adopted, polyacrylamide powder or polyaluminium chloride powder or the mixed powder of polyacrylamide and polyaluminium chloride and ferromanganese spinel (MnFe)2O4) Or birnessite (MnO)2) The powder is mixed according to the mass ratio of 5-10: 1, so that the effects of ozone enhanced catalysis and sludge enhanced concentration can be synchronously achieved in the subsequent adding process.
Preferably, in step S2, the initial water content of the sludge is 98-99%, and the mass ratio of volatile solids to total solids is 30-70%.
Preferably, in step S2, the dosage of the low-dosage high-concentration ozone is 1-5 mg/g of sludge dry solids, the ozone flow rate (L/min) value is obtained by dividing the total ozone dosage (mg) by the ozone concentration (mg/L) and then by the total air flotation duration (min), and the total ozone dosage (mg) is obtained by multiplying the initial sludge dry solids mass (g) by the ozone dosage (mg/g of sludge dry solids).
In the invention, the selection of the ozone dosage is a crucial link for determining the process cost and the air flotation concentration efficiency, the process cost is increased due to overhigh ozone dosage, the air flotation concentration efficiency is difficult to effectively increase due to overlow ozone dosage, the inventor researches show that when high-concentration ozone (300-800 mg/L) is adopted as an air source, the total dosage of the required ozone can be reduced by 30-50% compared with the traditional ozone concentration (150mg/L), and the invention controls the high-concentration ozone dosage to be 1-5 mg/g sludge drying and solidifying.
Preferably, in step S2, the added mass of the air flotation concentration agent is 0.5 to 1 per mill of the dry weight of the sludge. According to the invention, the air flotation concentration agent is a factor influencing air flotation concentration efficiency, agent cost and secondary pollution risk, the water content of concentrated sludge is difficult to reduce due to the fact that the adding quality of the air flotation concentration agent is too low, the agent cost and the secondary pollution risk of subsequent treatment and disposal of sludge are increased due to the fact that the adding quality of the air flotation concentration agent is too high, the adding quality of the air flotation concentration agent is controlled to be 0.5-1 per mill of the dry weight of the sludge, and the adding amount of the air flotation concentration agent can be greatly reduced compared with 1-3 per mill of the traditional air flotation concentration under the premise that a small amount of metal catalyst is added in the traditional chemical flocculation agent and a high-concentration ozone source is adopted for air flotation concentration.
Preferably, in step S2, the diameter of the micro-nano bubbles is 1-10 um. According to the invention, the diameter of the ozone micro-nano bubbles is a factor influencing the utilization efficiency of ozone and further influencing the air flotation concentration efficiency, when the diameter of the micro-nano bubbles is too small, the energy consumption for generating the micro-nano bubbles is increased, so that the energy consumption and the cost investment of the whole process are increased, and when the diameter of the micro-nano bubbles is too large, the reaction rate between ozone and sludge is influenced, so that the diameter of the micro-nano bubbles is controlled to be 1-10 um.
Preferably, the water content of the concentrated sludge obtained in the step S3 is 90-92%, the antibiotic pollutants are removed by 50-70%, and the pathogenic bacteria are removed by more than 90%.
Preferably, the chroma of the concentrated effluent obtained in the step S4 is reduced to 5-10 ℃, the antibiotic pollutants are removed by 50-70%, and the pathogenic bacteria are removed by more than 90%.
A system for strengthening sludge air-flotation concentration reduction and harmlessness by using high-concentration ozone comprises a gas-liquid mixing pump, a pressure dissolved gas tank, an air-flotation concentration tank, a slag scraping machine and a circuit control panel which are arranged on a flat plate base with wheels, wherein the whole set of equipment can move stably;
the bottom of the gas-liquid mixing pump is fixed on the base by screws, the outlet of the gas-liquid mixing pump is connected with a piston, and then the outlet of the gas-liquid mixing pump is vertically connected with the inlet at the bottom of the pressure dissolved air tank;
the pressure dissolved air tank is oval, the bottom and the upper part of the pressure dissolved air tank are respectively provided with an outlet, the upper end and the lower end of the bottom of the pressure dissolved air tank are hollow hemispheroids, the middle part of the pressure dissolved air tank is a hollow cylinder, and the upper part of the pressure dissolved air tank is connected with a pressure gauge, an air release valve and an air collecting device;
the air flotation concentration tank is a cylindrical stainless steel body, the bottom of the air flotation concentration tank is welded on a movable flat car, an air flotation contact chamber welded by stainless steel metal is arranged in the middle of the air flotation concentration tank, dissolved air water enters a transverse pipeline under the control of a valve from a pressure container tank, the dissolved air water is changed into a vertical pipeline through the direction of an elbow pipeline and enters the air flotation contact chamber, a gas-liquid releaser is connected at the tail end of the vertical pipeline, a concentrated water outlet guide pipe is arranged at the bottom of the air flotation concentration tank, and a spherical valve is arranged at the tail part of the guide pipe to control the water outlet flow;
the slag scraper is arranged at the top end of the air flotation concentration tank, a metal support is welded at the top end of the air flotation concentration tank, a slag scraping motor is vertically arranged on the metal support, the tail end of a transmission shaft of the slag scraping motor is connected with an X-shaped slag scraping plate, the slag scraping plate is embedded in the top end of the air flotation concentration tank, a trapezoidal sludge receiving groove is arranged close to the lower part of the slag scraping plate, the upper part of the sludge receiving groove is horizontally connected with the slag scraping plate, the sludge receiving groove is connected with an external sludge outlet, and the horizontal part and the elbow part of the sludge outlet are both made of stainless steel materials;
the circuit control panel is a rectangular stainless steel shell, and the surface of the shell is provided with a main power switch button for controlling each operation unit and a button for independently controlling the power switch of each operation unit.
Preferably, the upper end of the air flotation contact chamber is an inverted conical opening and is communicated with the air flotation concentration tank, the lower end of the air flotation contact chamber is cylindrical, the effective volume of the air flotation contact chamber is 1/3-1/4 of the air flotation concentration tank, the small volume of the air flotation contact chamber is not beneficial to full contact and reaction of gas and sludge, and the large volume of the air flotation contact chamber is easy to cause rapid dispersion of bubbles, so that the sludge floating efficiency is reduced.
The main innovation points of the invention are as follows:
(1) most of the existing air flotation concentration technologies are added with a large amount of chemical agents, so that the material consumption is increased, and simultaneously, a large secondary pollution risk is brought to the subsequent treatment and disposal of the sludge; the existing ozone air flotation concentration technology has low ozone concentration (150mg/L), low reaction rate with sludge extracellular polymers, needs to add a large amount of metal catalysts or utilize external voltage to strengthen advanced oxidation reaction while having certain requirements on ozone dosage, improves energy consumption and cost on one hand, and increases secondary pollution risk of subsequent treatment and disposal of sludge on the other hand. According to the invention, high-concentration ozone (300-800 mg/L) is used for air flotation concentration of sludge for the first time, so that the reaction efficiency of ozone and sludge extracellular polymers is improved, the air flotation concentration efficiency is improved, and the use cost of ozone is reduced on the premise of greatly reducing the ozone dosage;
(2) when high-concentration ozone (300-800 mg/L) is used as an air source, a small amount of metal catalyst is added to oxidize the ozone to form a relatively obvious catalytic effect, so that the using amount of the metal catalyst is greatly reduced compared with the traditional ozone concentration (below 150mg/L), the material consumption cost is reduced, and the risk of secondary pollution is reduced; the method has the advantages that high-concentration ozone (300-800 mg/L) is used as an air source, a small amount of metal catalyst is added, and meanwhile, a small amount of chemical flocculating agent is added, so that an obvious effect on the flocculation performance of sludge can be achieved, and therefore compared with an air source or a traditional ozone concentration (below 150mg/L) air source, the use amount of the chemical flocculating agent is greatly reduced, the material consumption cost is reduced, and meanwhile, the secondary pollution risk is reduced;
(3) according to the invention, high-concentration ozone (300-800 mg/L), a small amount of metal catalyst and chemical flocculation reagent and micro-nano bubble injection mode are coupled for the first time, so that the water content of the concentrated sludge can be increased to 90-92% from the traditional 95% on the premise of greatly reducing the addition amount of the chemical flocculation reagent and the metal catalyst, not applying voltage and saving the ozone consumption, and the air flotation concentration efficiency is greatly improved.
Compared with the prior art, the invention has the following advantages:
(1) when high-concentration ozone (300-800 mg/L) is used as an air source, the total dosage of the required ozone is 1-5 mg/g of sludge dry solids, and can be reduced by 30-50% compared with the traditional ozone concentration (150 mg/L).
(2) High-concentration ozone (300-800 mg/L) is used as an air source, a small amount of metal catalyst (0.05-0.2 per mill of the dry weight of sludge) is added, the adding mass of the air flotation concentration agent only needs 0.5-1 per mill of the dry weight of the sludge, and the adding amount of the air flotation concentration agent can be greatly reduced by 1-3 per mill compared with that of the traditional air flotation concentration agent.
(3) On the premise of greatly reducing the using amount of ozone, the water content of the concentrated sludge is quickly increased to 90-92% from the traditional 95-96%, and the air flotation concentration efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a process system of the present invention;
reference numerals: 01-pressure gauge and air release valve integrated device; 02-circuit control panel; 03-gas-liquid mixing pump and its base; 04-movable flat car; 05-a slag scraper motor; a 06-X type slag scraping plate; 07-a sludge outlet; 08-transverse pipes; 09-elbow piping; 10-an air flotation contact chamber; 011-bottom inlet of pressure dissolved air tank; 012-gas-liquid releaser; 013-concentration water outlet conduit; 014-valve; 015-a gas collection device; 016-pressure vessel tank; 017-air flotation concentration tank.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
Referring to fig. 1, a system for enhancing air flotation concentration reduction and harmlessness of sludge by using high concentration ozone comprises a gas-liquid mixing pump, a pressure dissolved gas tank, an air flotation concentration tank, a slag scraper and a circuit control panel 02 which are arranged on a flat plate base with wheels, wherein the whole set of equipment can move stably;
the gas-liquid mixing pump and a base 03 thereof are arranged on the movable flat car 04, an outlet is connected with a piston, and then the outlet is vertically connected with an inlet 011 at the bottom of the pressure dissolved air tank;
the pressure dissolved air tank is oval, the bottom and the upper part of the pressure dissolved air tank are respectively provided with an outlet, the upper end and the lower end of the bottom of the pressure dissolved air tank are hollow hemispheroids, the middle part of the pressure dissolved air tank is a hollow cylinder, and the upper part of the pressure dissolved air tank is connected with a pressure meter and air release valve integrated device 01 and a gas collecting device 015;
the air flotation concentration tank 017 is a cylindrical stainless steel body, the bottom of the air flotation concentration tank 017 is welded on the movable flat car 04, an air flotation contact chamber 10 welded by stainless steel metal is arranged in the middle of the air flotation concentration tank 017, dissolved air water is controlled by a pressure container tank 016 to enter a transverse pipeline 08 through a valve 014, the direction of the dissolved air water is changed into a vertical pipeline through an elbow pipeline 09 to enter the air flotation contact chamber 10, a gas-liquid releaser 012 is connected at the tail end of the vertical pipeline, a concentrated water outlet conduit 013 is arranged at the bottom, and a ball valve is arranged at the tail of the conduit to control the water flow rate;
the slag scraper is arranged at the top end of the air flotation concentration tank 017, a metal support is welded at the top end of the air flotation concentration tank 017, a slag scraper motor 05 is vertically arranged on the metal support, the tail end of a transmission shaft of the slag scraper motor is connected with an X-shaped slag scraper 06, the slag scraper is embedded in the top end of the air flotation concentration tank 017, a trapezoidal sludge receiving groove is arranged close to the lower part of the slag scraper, the upper part of the sludge receiving groove is horizontally connected with the slag scraper, the sludge receiving groove is connected with an external sludge outlet 07, and the horizontal part and the elbow part of the sludge outlet 07 are made of stainless steel materials;
the circuit control panel is a rectangular stainless steel shell, and the surface of the shell is provided with a main power switch button for controlling each operation unit and a button for independently controlling the power switch of each operation unit.
The upper end of the air flotation contact chamber is an inverted conical opening and is communicated with the air flotation concentration tank 017, the lower end of the air flotation contact chamber is cylindrical, the effective volume of the air flotation contact chamber is 1/3-1/4 of the air flotation concentration tank 017, the volume of the air flotation contact chamber is too small to facilitate full contact and reaction of gas and sludge, and the volume of the air flotation contact chamber is too large to easily cause rapid dispersion of bubbles, so that the sludge floating efficiency is reduced.
By adopting the system and the method for strengthening the air flotation concentration reduction and the harmlessness of the sludge by using the high-concentration ozone, the method comprises the following steps:
(1) mixing polyacrylamide powder and polyaluminium chloride powder with ferromanganese spinel (MnFe)2O4) Mixing the powder according to the mass ratio of 5:1 to obtain an air flotation concentration agent;
(2) adding an air flotation concentrated agent accounting for 1 thousandth of the dry weight of the sludge into the sludge with the water content of 99 percent and the mass proportion of volatile solids accounting for 70 percent of the total solids, mixing in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles with the diameter of 10 microns by high-concentration ozone (800mg/L) with the total dose of 5mg/g of the dry weight of the sludge through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentrated agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
(3) pumping the mixed liquid in the pressure container into an air floatation contact chamber, and after air floatation is carried out for 10min, opening a slag scraping plate to remove floating concentrated sludge;
(4) after 60min of air flotation, the concentrated sludge floats upwards completely, is removed by a slag scraping plate and then is led out through a sludge outlet, then the whole system continues to work for 10min, and the supernatant of the sludge after air flotation is disinfected and then is discharged as bottom effluent through a concentrated effluent guide pipe.
(5) The water content of the obtained concentrated sludge is 90%, the antibiotic pollutants in the sludge are removed by 70%, and the pathogenic bacteria are removed by 91%; the chroma of the concentrated effluent is reduced to 10 ℃, the antibiotic pollutants are removed by 70 percent, and the pathogenic bacteria are removed by 92 percent.
Example 2
A method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone comprises the following steps:
(1) mixing polyacrylamide powder and polyaluminium chloride powder with birnessite (MnO)2) Mixing the powder according to the mass ratio of 10:1 to obtain an air flotation concentration agent;
(2) adding an air flotation concentration agent accounting for 0.5 per thousand of the dry weight of the sludge into the sludge with the water content of 98 percent and the mass proportion of volatile solids accounting for 30 percent of the total solids, mixing in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles with the diameter of 1um by high-concentration ozone (300mg/L) with the total dose of 1mg/g of the dry weight of the sludge through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentration agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
(3) pumping the mixed liquid in the pressure container into an air floatation contact chamber, and opening a slag scraping plate to remove the floated concentrated sludge after air floatation for 5 min;
(4) floating the concentrated sludge completely after air floatation for 30min, removing the sludge by a slag scraping plate, leading out the sludge through a sludge outlet, continuously working the whole system for 5min, and discharging the sludge supernatant after air floatation as bottom effluent by a concentrated effluent guide pipe after disinfection treatment.
(5) The water content of the obtained concentrated sludge is 92%, the antibiotic pollutants in the sludge are removed by 50%, and the pathogenic bacteria are removed by 90%; the chroma of the concentrated effluent is reduced to 5 ℃, the antibiotic pollutants are removed by 50 percent, and the pathogenic bacteria are removed by 91 percent.
Comparative example 1
A method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone comprises the following steps:
(1) mixing polyacrylamide powder and polyaluminium chloride powder with ferromanganese spinel (MnFe)2O4) Mixing the powder according to the mass ratio of 5:1 to obtain an air flotation concentration agent;
(2) adding an air flotation concentrated agent accounting for 1 thousandth of the dry weight of the sludge into the sludge with the water content of 99 percent and the mass proportion of volatile solids accounting for 70 percent of the total solids, mixing in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles with the diameter of 10 microns by low-concentration ozone (150mg/L) with the total dose of 5mg/g of the dry weight of the sludge through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentrated agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
(3) pumping the mixed liquid in the pressure container into an air floatation contact chamber, and opening a slag scraping plate to remove the floated concentrated sludge after air floatation for 5 min;
(4) floating the concentrated sludge completely after air floatation for 30min, removing the sludge by a slag scraping plate, leading out the sludge through a sludge outlet, continuously working the whole system for 5min, and discharging the sludge supernatant after air floatation as bottom effluent by a concentrated effluent guide pipe after disinfection treatment.
(5) The water content of the obtained concentrated sludge is 96%, the antibiotic pollutants in the sludge are removed by 30%, and the pathogenic bacteria are removed by 60%; the chroma of the concentrated effluent is reduced to 20 ℃, the antibiotic pollutants are removed by 30 percent, and the pathogenic bacteria are removed by 60 percent.
As can be seen from comparative example 1, when low-concentration ozone is adopted, the water content of the obtained concentrated sludge, antibiotic pollutants in the sludge and the pathogenic bacteria removal rate are not good; the color of the concentrated effluent is poor in the effect of removing antibiotic pollutants and pathogenic bacteria.
Comparative example 2
A method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone comprises the following steps:
(1) directly taking the mixed powder of polyacrylamide powder and polyaluminium chloride as an air flotation concentration agent;
(2) adding an air flotation concentrated agent accounting for 1 thousandth of the dry weight of the sludge into the sludge with the water content of 99 percent and the mass proportion of volatile solids accounting for 70 percent of the total solids, mixing in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles with the diameter of 10 microns by high-concentration ozone (800mg/L) with the total dose of 5mg/g of the dry weight of the sludge through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentrated agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
(3) pumping the mixed liquid in the pressure container into an air floatation contact chamber, and opening a slag scraping plate to remove the floated concentrated sludge after air floatation for 5 min;
(4) floating the concentrated sludge completely after air floatation for 30min, removing the sludge by a slag scraping plate, leading out the sludge through a sludge outlet, continuously working the whole system for 5min, and discharging the sludge supernatant after air floatation as bottom effluent by a concentrated effluent guide pipe after disinfection treatment.
(5) The water content of the obtained concentrated sludge is 95 percent, the antibiotic pollutants in the sludge are removed by 50 percent, and the pathogenic bacteria are removed by 80 percent; the chroma of the concentrated effluent is reduced to 15 ℃, the antibiotic pollutants are removed by 50 percent, and the pathogenic bacteria are removed by 80 percent.
As can be seen from comparative example 2, when the mixed powder of polyacrylamide powder and polyaluminium chloride is directly used as an air flotation concentration agent, the water content of the obtained concentrated sludge, antibiotic pollutants in the sludge and the pathogenic bacteria removal rate are not good; the color of the concentrated effluent is poor in the effect of removing antibiotic pollutants and pathogenic bacteria.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone is characterized by comprising the following steps:
s1, preparing or preparing an air flotation concentrated medicament;
s2, mixing the sludge and the air flotation concentrated agent in an air flotation concentration tank, then feeding the mixture into a pressure container tank through a gas-liquid mixing pump, generating micro-nano bubbles by low-dose high-concentration ozone through a micro-nano bubble generating unit, and then feeding the micro-nano bubbles into the pressure container tank through the gas-liquid mixing pump, so that the sludge, the air flotation concentrated agent and the high-concentration ozone are uniformly mixed in the pressure container tank;
s3, pumping the mixed liquid in the pressure container tank into an air floatation contact chamber, carrying out air floatation for 5-10 min, and then opening a slag scraping plate to remove the floating concentrated sludge;
s4, floating the concentrated sludge after air floatation for 30-60 min, removing the sludge by a scraper, leading out the sludge through a sludge outlet, continuing working for 5-10 min, and discharging the supernatant of the sludge after air floatation as bottom effluent through a concentrated effluent guide pipe.
2. The method as claimed in claim 1, wherein the air flotation agent is prepared by mixing powder A and powder B at a mass ratio of 5-10: 1 in step S1, wherein the powder A is one or both of polyacrylamide powder and polyaluminium chloride powder; the powder B is ferromanganese spinel or birnessite powder.
3. The method as claimed in claim 1, wherein in step S2, the initial water content of the sludge is 98-99%, and the mass ratio of volatile solids to total solids is 30-70%.
4. The method as claimed in claim 1, wherein in step S2, the concentration of ozone is 300-800 mg/L, and the ratio of the ozone dosage to the sludge dry solids is 1-5 mg/g.
5. The method as claimed in claim 1, wherein in step S2, the air flotation agent is added in an amount of 0.5-1% by dry weight of the sludge.
6. The method as claimed in claim 1, wherein in step S2, the micro-nano bubbles have a diameter of 1-10 um.
7. The method as claimed in claim 1, wherein the water content of the concentrated sludge obtained in step S3 is 90-92%, the antibiotic pollutants are removed by 50-70%, and the pathogenic bacteria are removed by more than 90%.
8. The method for strengthening air flotation concentration reduction and harmlessness of sludge by using high-concentration ozone as claimed in claim 1, wherein the chroma of the concentrated effluent obtained in step S4 is reduced to 5-10 ℃, 50-70% of antibiotic pollutants are removed, and more than 90% of pathogenic bacteria are removed.
9. A system for strengthening sludge air-flotation concentration reduction and harmlessness by using high-concentration ozone is characterized by comprising a gas-liquid mixing pump, a pressure dissolved gas tank, an air-flotation concentration tank, a slag scraping machine and a circuit control panel which are arranged on a flat plate base with wheels,
the bottom of the gas-liquid mixing pump is fixed on the base, and the outlet of the gas-liquid mixing pump is connected with the inlet at the bottom of the pressure dissolved air tank through the piston;
outlets are arranged at the bottom and the upper part of the pressure dissolved air tank, and a pressure gauge, an air release valve and an air collecting device are connected to the upper part of the pressure dissolved air tank;
the bottom of the air flotation concentration tank is arranged on the base, an air flotation contact chamber is arranged in the middle of the air flotation concentration tank, dissolved air water enters a transverse pipeline from a pressure container tank under the control of a valve, the dissolved air water is changed into a vertical pipeline through the direction of an elbow pipeline and enters the air flotation contact chamber, a gas-liquid releaser is connected at the tail end of the vertical pipeline, a concentrated water outlet guide pipe is arranged at the bottom, and a spherical valve is arranged at the tail part of the guide pipe;
the sediment machine of scraping is settled on the air supporting concentration tank top, and the welding of air supporting concentration tank top has metal support, scrapes the sediment machine and installs perpendicularly on metal support, scrapes the transmission shaft end-to-end connection X type scum board of sediment machine, and the scum board is inlayed inside air supporting concentration tank top, is equipped with trapezoidal mud receiving groove near the scum board lower part, connects mud groove upper portion and scum board level link up, and the mud receiving groove links to each other with outside mud outlet.
10. The system as claimed in claim 9, wherein the upper end of the flotation contact chamber is an inverted cone-shaped opening communicating with the flotation concentration tank, and the lower end is a cylindrical shape, and the effective volume of the flotation contact chamber is 1/3-1/4 of the flotation concentration tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111664362.7A CN114292005A (en) | 2021-12-31 | 2021-12-31 | Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111664362.7A CN114292005A (en) | 2021-12-31 | 2021-12-31 | Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114292005A true CN114292005A (en) | 2022-04-08 |
Family
ID=80972923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111664362.7A Pending CN114292005A (en) | 2021-12-31 | 2021-12-31 | Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114292005A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956499A (en) * | 2022-04-29 | 2022-08-30 | 同济大学 | Ozonization conditioning coupled hydrothermal rapid stabilization treatment process for organic sludge |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS594497A (en) * | 1982-06-30 | 1984-01-11 | Hitachi Metals Ltd | Cleaning up and dehydrating method of sludge |
| JPH10192898A (en) * | 1997-01-14 | 1998-07-28 | Meidensha Corp | Sludge treatment method |
| CN204324936U (en) * | 2014-12-23 | 2015-05-13 | 陕西兰环环境工程集团有限公司 | Vertical-flow ozone air-float equipment |
| CN105859076A (en) * | 2016-06-14 | 2016-08-17 | 上海同臣环保有限公司 | Ozone microbubble air floating concentration device and sludge conditioning and concentration method |
| CN108383349A (en) * | 2018-05-14 | 2018-08-10 | 上海城市水资源开发利用国家工程中心有限公司 | A kind of novel residual active sludge carbon source retracting device and method |
| CN109574458A (en) * | 2019-01-09 | 2019-04-05 | 北京伟创力科技股份有限公司 | A kind of processing method and processing device of oily sludge |
| CN111018289A (en) * | 2019-12-19 | 2020-04-17 | 南京銮鑫环境科技有限公司 | Sludge reduction treatment system and method based on ozone micro-nano bubbles |
| CN111138057A (en) * | 2020-01-07 | 2020-05-12 | 上海交通大学 | E+Device and method for deep treatment of oily sludge by micro-nano bubble ozone |
| CN112876024A (en) * | 2021-01-26 | 2021-06-01 | 同济大学 | Modification method for in-situ sludge reduction of sewage treatment plant |
-
2021
- 2021-12-31 CN CN202111664362.7A patent/CN114292005A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS594497A (en) * | 1982-06-30 | 1984-01-11 | Hitachi Metals Ltd | Cleaning up and dehydrating method of sludge |
| JPH10192898A (en) * | 1997-01-14 | 1998-07-28 | Meidensha Corp | Sludge treatment method |
| CN204324936U (en) * | 2014-12-23 | 2015-05-13 | 陕西兰环环境工程集团有限公司 | Vertical-flow ozone air-float equipment |
| CN105859076A (en) * | 2016-06-14 | 2016-08-17 | 上海同臣环保有限公司 | Ozone microbubble air floating concentration device and sludge conditioning and concentration method |
| CN108383349A (en) * | 2018-05-14 | 2018-08-10 | 上海城市水资源开发利用国家工程中心有限公司 | A kind of novel residual active sludge carbon source retracting device and method |
| CN109574458A (en) * | 2019-01-09 | 2019-04-05 | 北京伟创力科技股份有限公司 | A kind of processing method and processing device of oily sludge |
| CN111018289A (en) * | 2019-12-19 | 2020-04-17 | 南京銮鑫环境科技有限公司 | Sludge reduction treatment system and method based on ozone micro-nano bubbles |
| CN111138057A (en) * | 2020-01-07 | 2020-05-12 | 上海交通大学 | E+Device and method for deep treatment of oily sludge by micro-nano bubble ozone |
| CN112876024A (en) * | 2021-01-26 | 2021-06-01 | 同济大学 | Modification method for in-situ sludge reduction of sewage treatment plant |
Non-Patent Citations (2)
| Title |
|---|
| 孙相娟等: "高、低浓度臭氧在中试规模污泥原位减量系统的应用研究", 《中国环境科学》 * |
| 马艳: "臭氧微纳米气泡技术在水处理中的应用进展", 《净水技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956499A (en) * | 2022-04-29 | 2022-08-30 | 同济大学 | Ozonization conditioning coupled hydrothermal rapid stabilization treatment process for organic sludge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Neyens et al. | A review of thermal sludge pre-treatment processes to improve dewaterability | |
| CN100390081C (en) | Process method for waste water containing nitrobenzene and aniline | |
| CN202785890U (en) | Advanced treatment and recycling device for textile printing and dyeing wastewater | |
| JP4910415B2 (en) | Organic wastewater treatment method and apparatus | |
| CN108558116B (en) | Electric flocculation, magnetic flocculation and multistage oxidation integrated sewage treatment system and method | |
| CN111253016A (en) | Treatment system and method for landfill leachate | |
| CN101638257B (en) | Method and device for treating dye wastewater employing periodic reverse electrocoagulation | |
| CN102616998B (en) | Device for treating wastewater produced in production process of alkaline peroxide mechanical pulp (APMP) | |
| CN101700949B (en) | Waste leachate purification process method | |
| CN114292005A (en) | Method and system for strengthening air flotation concentration reduction and harmlessness of sludge by using ozone | |
| CN216946374U (en) | Ozone and hydrogen peroxide high-efficiency combined catalytic oxidation wastewater treatment device | |
| CN105585184B (en) | A kind of the circulated sprinkling liquid processing method and device of the discharge of dyeing waste water deodoration system | |
| CN112876024B (en) | Modification method for in-situ sludge reduction of sewage treatment plant | |
| CN109160674B (en) | Purification method of emulsion-containing wastewater | |
| CN110606649B (en) | Sludge conditioning and dewatering method and device | |
| JPH0679300A (en) | Sewage treating agent and treatment of sewage | |
| CN107082531A (en) | The processing method and its device of a kind of organic wastewater from lab | |
| CN107915366A (en) | A kind of technique that advanced treating is carried out to garbage leachate using ozone | |
| CN217077108U (en) | Sewage treatment system based on ozone catalytic oxidation air supporting integration | |
| CN110040913A (en) | A kind of advanced treatment process and device of biology non-degradable waste water | |
| CN211570404U (en) | Waste emulsion treatment device | |
| CN108117196A (en) | Leather waste water advanced treatment system and method | |
| CN210559880U (en) | A preprocessing device for infiltration liquid membrane concentrate MVR evaporates | |
| CN207877528U (en) | Organic wastewater treatment system | |
| CN210457809U (en) | Advanced treatment device for printing and dyeing 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 |