CN114853185A - High-inorganicity sludge inorganics separation and recycling system and process - Google Patents
High-inorganicity sludge inorganics separation and recycling system and process Download PDFInfo
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Abstract
The invention relates to a system and a process for separating and recycling inorganic substances of sludge with high inorganic rate. The process comprises the steps of enabling high inorganic rate sludge which is treated by a biochemical O/A tank and enters a secondary sedimentation tank for solid-liquid separation to be output to fully drop inorganic particles wrapped by zoogloea under the combined action of an ultrasonic unit and a stirring unit, and sending mixed sludge to a cyclone separator to separate organic sludge (light sludge) and inorganic sludge (heavy sludge); the separated heavy sludge is treated by a sludge dewatering system and then is transported outside, the separated light sludge is cultured and proliferated by a sludge storage system in sequence, a strain preparation system is used for concentrating and drying to prepare a solid microbial agent, and a strain activation system is used for activating the solid microbial agent and recycling the solid microbial agent to a biochemical O/A pool. The application performs light-weight separation on the sludge in the biochemical pool, improves the sludge activity and biochemical treatment capacity and efficiency, prepares a dried strain by using the activated light sludge, and provides a new resource utilization way for the excess sludge.
Description
Technical Field
The invention belongs to the technical field of sludge treatment and disposal, and particularly relates to a system and a process for inorganic substance separation and recycling of sludge with high inorganic rate.
Background
The development of coal chemical industry using coal gasification as tap, the production of clean energy chemical products such as methanol, glycol, synthetic oil, dimethyl ether and the like, and further development are further deepened, and the method is the strategic demand of economic development in China. The sewage generated by coal gasification has the characteristic of high hardness, and brings a plurality of technical difficulties for the biochemical treatment of the coal chemical industry sewage. The sewage biochemical unit comprises an A tank and an O tank, wherein activated sludge MLSS comprises an organic component and an inorganic component, wherein the quantity of active microorganisms in the sludge is indirectly reflected by the organic component MLVSS, the MLVSS/MLSS ratio is commonly used for evaluating the activity of the sludge in the operation regulation and control of a sewage plant, the MLVSS/MLSS ratio of the activated sludge for treating domestic sewage is about 0.75 under the general condition, for industrial sewage, the MLVSS/MLSS ratio is different due to different water qualities, the difference of the MLVSS/MLSS ratio is large, the inorganization condition of the activated sludge in the biochemical tank is serious due to high calcium magnesium hardness of the water quality of coal gasification wastewater, the MLVSS is low, the MLVSS/MLSS is only 0.3-0.5 and even as low as 0.2 usually, wherein calcium carbonate accounts for about 85-90% in inorganic substances, and the following problems are caused by high inorganic substances in the sludge:
1. when MLVSS/MLSS is reduced due to the accumulation of a large amount of inorganic particles in the activated sludge mixed liquor, in order to ensure the level of active microorganisms in the sludge, a sewage plant has to increase the sludge concentration to ensure the treatment effect, so that the sludge discharge is reduced, and the decrease of the sludge discharge causes the aggravated accumulation of the inorganic particles, so that the sludge concentration is higher and higher in the vicious circle, the sediment at the bottom of a biochemical pool is obviously deposited, and the dredging frequency of the sewage plant is improved;
2. the effective volume of the biochemical tank is reduced by the deposition of the inorganic particles in the biochemical tank, so that the retention time of sewage in the biochemical tank is reduced, and the sewage treatment efficiency is reduced;
3. biochemical sludge has high inorganic rate, low MLVSS, low microbial preservation quantity in a biochemical pool, low processing capacity and efficiency, high energy consumption of oxygenating equipment and weak water impact resistance, and a biochemical system is recovered slowly after maintenance or impact, so that inoculated sludge is difficult to preserve;
4. the sludge with high sand content can reduce the cake forming rate of the sludge during dehydration, and the filter cloth of the filter press is excessively worn, so that the service life is shortened;
5. when the sludge with high sand content is conveyed, the pump shell and the end part of the steel pipeline elbow are easier to wear through;
6. the residual sludge with high sand content and low gas production rate and sludge heat value improves the incineration cost of the sludge and restricts the treatment and disposal of the residual sludge.
How to effectively remove the fine silt in the activated sludge becomes a problem to be solved urgently in a sewage treatment system. CN201610406098.X provides a coal-containing sludge concentration and separation method and device, which realizes heavy sludge, light sludge concentration and clear liquid separation by one-step treatment based on air flotation principle, but because fine silt in sludge is captured by activated sludge floc, air flotation can only treat inorganic sludge which is not coated, small-particle inorganic matter coated by microorganism such as bacteria cannot be solved, and treatment effect is poor; CN201110159013.X provides a separator suitable for removing silt from activated sludge of sewage treatment plants, and the silt and the sludge generate different gyration radii in the rotation process by utilizing the difference of particle sizes and densities of the silt and the sludge, so that the silt and the sludge are separated.
CN201811010056.X provides a sludge desanding process and a sludge desanding system, wherein sludge is subjected to slurry reaction, hydrothermal reaction and flash evaporation reaction in sequence and then subjected to cyclone desanding; CN200910227265.4 proposes a method for sludge reduction by ultrasonic-magnetic field coupled sludge disintegration, excess sludge is mainly in a reactor provided with ultrasonic and magnetic field devices, ultrasonic cavitation effect generated by ultrasonic and magnetic field effect are organically combined together, thus greatly strengthening the sludge disintegration effect by ultrasonic; CN201611176156.0 provides an ultrasonic filler combined sludge reduction device and a process, wherein ultrasonic generates powerful shearing force to reduce the particle size of sludge particles and increase the specific surface area of the particles, so that the device is suitable for absorption and utilization of subsequent unit reduction microorganisms; can also lyse more carbon source to provide for the proliferation of the microorganism, and highly realize the sludge reduction. The separation method mainly aims to achieve the effect of sludge reduction by removing microorganisms in sludge, destroy organic matters in activated sludge and cannot realize resource utilization of organic sludge.
Therefore, it is necessary to develop an inorganic substance separation technique for sludge with high inorganic content, to reduce inorganic particles in activated sludge, and to realize resource utilization of sludge.
Disclosure of Invention
In one aspect, the invention provides a high inorganic rate sludge inorganic matter separation and resource system, which can effectively separate light and heavy matters from biochemical tank sludge, improve the sludge activity and biochemical treatment capacity and efficiency, and simultaneously utilize the activated light sludge to prepare dried strains for storage and utilization, provide a new resource utilization path for excess sludge, and have economic and efficient sewage and wastewater treatment capacities.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high inorganic rate sludge inorganic matter separation and resource system comprises an O/A tank and a secondary sedimentation tank which are sequentially connected by pipelines, so that coal gasification wastewater entering a biochemical treatment system is treated by the O/A tank and then is subjected to solid-liquid separation in the secondary sedimentation tank to output high inorganic rate sludge,
the system also comprises a heavy sludge modification system and a light and heavy sludge separation system, wherein the heavy sludge modification system is connected in sequence along the sludge flowing direction and is used for releasing and falling small-particle inorganic substances coated by zoogloea under the condition of not influencing the microbial activity, the light and heavy sludge separation system is used for separating silt and sludge according to the difference of particle size and density, and the separated heavy sludge is conveyed into a sludge dewatering system for treatment and then is transported outside for disposal;
and the separated part or all of the light sludge is recycled to the biochemical O/A pool through a recycling loop, the recycling loop comprises a sludge storage system, a strain preparation system and a strain activation system which are sequentially connected to the light sludge output end of the sludge separation system, and the output end of the strain activation system is connected to the biochemical O/A pool to supplement beneficial microorganisms for wastewater treatment.
In some embodiments, the heavy sludge modification system includes an ultrasonic unit acting together on the sludge to rapidly release small particle inorganic substances coated with zoogles using cavitation effect and a stirring unit to promote shedding of the released inorganic substances.
In some embodiments, the light and heavy sludge separation system is provided with a cyclone separator, the cyclone separator comprises an upper cylindrical section and a lower conical section, the mixed sludge is input into an inner cavity of the cyclone separator through a feed inlet tangential to the wall surface of the cylindrical section, the top end of the cyclone separator is provided with an overflow sludge discharge port with adjustable insertion depth, and the bottom end of the cyclone separator is provided with a sand discharge port.
In some embodiments, the overflow sludge discharge port extends to 0.7-0.8 of the height of the cylindrical section, and the diameter of the overflow sludge discharge port is 0.1-0.3 of the diameter of the cylindrical section; the diameter of the sand discharge opening is 0.1-0.25 of the diameter of the cylindrical section.
In some embodiments, the sludge storage system is provided with a nutrient input for microbial culture, and the sludge storage system bypasses to a biochemical O/a tank to replenish activated sludge rich in beneficial microbes for wastewater treatment.
On the other hand, the invention provides a high-inorganicity sludge inorganic substance separation and recycling process, which can realize effective separation of light sludge and heavy sludge, and can perform concentration and drying on the light sludge to prepare a solid microbial agent for targeted treatment of high-inorganicity wastewater for economic sale or reuse of biochemical tanks, and has the advantages of simple process, mild conditions and easily-obtained equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a process for separating inorganic substances from high-inorganic-rate sludge and recycling the inorganic substances comprises the following steps: pumping the coal gasification wastewater treated by the biochemical O/A tank into a secondary sedimentation tank for solid-liquid separation, outputting high inorganic rate sludge, sending the sludge to a heavy sludge modification system, fully releasing and falling inorganic particles wrapped by zoogloea under the combined action of an ultrasonic unit and a stirring unit, and simultaneously not influencing the microbial retention of the sludge, and pumping mixed sludge to a cyclone separator to sort out light sludge and heavy sludge according to the difference of silt and sludge in particle size and density;
the separated heavy sludge is treated by a sludge dewatering system and then transported out, the separated light sludge is cultured and proliferated by a sludge storage system in sequence, a strain preparation system is used for concentrating and drying to prepare a solid microbial agent, and a strain activation system is used for adding nutrients to activate the solid microbial agent and recycling the solid microbial agent to a biochemical O/A (oxygen/oxygen) pool to supplement beneficial microorganisms for wastewater treatment.
In some embodiments, the ultrasonic unit adopts an ultrasonic wave band of 20kHz-30kHz, the hydraulic retention time is 5-15min, and the sound energy density during ultrasonic treatment is 0.1-2W/ml; and/or the presence of a gas in the gas,
the stirring unit is provided with a stirrer which is eccentrically arranged to enhance axial mixing of sludge; and/or the presence of a gas in the gas,
the feeding speed of the cyclone separator is 8-12m/s, and the feeding pressure is 0.1-0.25 MPa.
In some embodiments, the invention provides that the sludge storage system is cultured and proliferated by feeding nutrients, wherein the nutrients comprise a carbon source, a nitrogen source, a phosphorus source and trace elements, the sludge storage system is connected back to the biochemical O/A pool to supplement activated sludge rich in beneficial microorganisms for wastewater treatment, the residence time of the sludge storage system for culture and proliferation is 2-4h, the temperature is 25-35 ℃, and the pH value is 6-8.
In some embodiments, the present invention provides the steps of concentrating and drying the strain preparation system to obtain the solid microbial agent, including: centrifugally concentrating the activated sludge rich in microorganisms, adding soluble starch, milk powder, glycerol and a composite carrier, uniformly stirring, drying at 40-60 ℃, grinding by a grinding machine, and screening to obtain the solid microbial agent.
In some embodiments, the step of adding the nutrient-activated solid microbial agent into the strain activation system provided by the present invention comprises: adding diluted sewage, a carbon source, a nitrogen source and a phosphorus source into a solid microbial agent for aeration culture activation, wherein the sewage is diluted by 2-10 times, the activation time is 12-72 hours, the temperature is 25-35 ℃, and the oxygen content is 2-3 mg/L; the carbon source is selected from one or more of glucose, sucrose, methanol and beef extract; the nitrogen source is selected from ammonium chloride and/or peptone; the phosphorus source is potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.
The invention adopts the technical scheme and at least has the following beneficial effects:
1. the high inorganic rate sludge is modified by adopting an ultrasonic and mechanical stirring combined action mode, the sludge loose combined organic polymer and zoogloea are quickly destroyed by utilizing an ultrasonic cavitation effect on the premise of not influencing the microbial activity, so that the inorganic particles wrapped in the sludge are released, and the released inorganic particles can fully fall off by combining stirring and mixing, so that the separation effect is enhanced;
2. inorganic particles in the mixed sludge are effectively removed through the light and heavy sludge separation system, so that the residual sludge of the whole sewage treatment system is reduced, the activity and the biochemical treatment capacity and efficiency of the sludge are improved, and the scaling of heavy sludge on biochemical system equipment and pipelines and the energy consumption of the equipment caused by the scaling are reduced;
3. the activated wet sludge siding preservation technology enables microbial strains of a biochemical system to be rapidly proliferated, can be directly returned to a biochemical tank for sewage treatment, and rapidly recovers abnormal states caused by organic matters or inhibitory impact loads, hydraulic load excess and the like;
4. the preservation technology of the activated sludge drying strain is characterized in that activated sludge rich in microorganisms is concentrated and dehydrated at low temperature to prepare a solid microbial inoculum, and the solid microbial inoculum can be preserved at normal temperature for a long time;
5. the activated sludge contains microorganisms with strong adaptability and various types, and contains various protozoa, so that the problem of shortage of high-quality activated sludge in sewage plants is solved, and various sewage and wastewater can be purified efficiently and pertinently;
6. the preparation production of the microbial agent is carried out by using the sludge as a raw material, so that a new resource way can be provided for the factory sludge, the treatment cost of the excess sludge is reduced, the benefit is increased by selling the microbial agent, and the preparation cost of the industrial microbial agent can be greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings and the reference numerals thereof used in the embodiments are briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a high inorganic rate sludge inorganic matter separation and recycling system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a high inorganicity sludge inorganics separation and recycling system according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of the feed inlet of a cyclone separator according to an embodiment of the present invention.
The figures are labeled as:
1-a strain activation system, 2-a biochemical treatment system, 3-a heavy sludge modification system, 4-a light and heavy sludge separation system, 5-a sludge storage system, 6-a dehydration unit and 7-a drying unit.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Referring to fig. 1 to 3, the present application provides a high inorganic rate sludge inorganic matter separation and recycling system, which comprises a biochemical treatment system 2, which comprises an O/a tank and a secondary sedimentation tank connected by a pipeline in sequence, coal gasification wastewater is input into a water inlet end of the anoxic tank, a supernatant of the secondary sedimentation tank is communicated with a downstream advanced treatment system, the bottom of the secondary sedimentation tank is communicated with a bypass for outputting high inorganic rate sludge, and a heavy sludge modification system 3 and a light and heavy sludge separation system 4 are sequentially connected to the bypass along a sludge flowing direction.
The heavy sludge modification system 3 comprises an ultrasonic unit and a stirring unit which jointly act on the sludge, and the stirring unit is provided with an eccentrically arranged stirrer. In the embodiment, the strong hydraulic shearing force generated by the ultrasonic action can quickly destroy the sludge loose combination type organic polymers and zoogloea, so that the inorganic particles wrapped in the sludge loose combination type organic polymers and zoogloea are released; the eccentric stirring design can enhance axial mixing, reduce short circuit, enable mixed sludge to be uniformly suspended in water, fully utilize the ultrasonic effect to enable inorganic substances released from the zoogloea to fall off, and enhance the separation effect. In a concrete example, select magnetic stirrers for use, its outer magnetic rotor installs in 3 shell bottoms on heavy matter mud modification system, and the stirring rake is installed to inside magnetic stirrers rotor upper end, and overall structure is simple, easy maintenance.
In a preferred embodiment, the heavy sludge modification system 3 adopts a shell with a closed double sound insulation steel structure, and a space between two layers of steel structures is vacuumized to achieve the purpose of sound insulation, so that the damage of ultrasonic to operators is prevented; the top of the shell of the heavy sludge modification system 3 can be detachably maintained, and the top is connected with the shell by a flange; the shell of the heavy sludge modification system 3 is also provided with a longitudinal transparent visual window, so that the internal condition can be observed conveniently.
The light and heavy sludge separation system 4 is provided with a cyclone separator, the cyclone separator comprises an upper cylindrical section and a lower conical section, mixed sludge is input into an inner cavity of the cyclone separator through a feed inlet tangential to the wall surface of the cylindrical section, an overflow sludge discharge port with adjustable insertion depth is installed at the top end of the cyclone separator, and a sand discharge port is arranged at the bottom end of the cyclone separator. In the embodiment, the mixed sludge enters the separator from the feed inlet in a tangential direction, the sludge rotates in the cavity to generate spiral flow, inorganic particles move to the wall surface of the cylindrical section under the action of large centrifugal force and are discharged from the bottom of the cyclone separator as underflow along with outer cyclone flow, and light activated sludge is discharged from an upper overflow port along with inner cyclone flow after long time of sedimentation due to small centrifugal force, so that the light activated sludge is separated from heavy inorganic substances.
In a preferred embodiment, the cyclone separator is selected from medium and small diameter hydrocyclones with a cone angle of 10-15 degrees, and a rectangular involute-shaped feeding pipe is adopted, so that the larger local resistance caused by the turning loss and the vortex loss of the fluid can be reduced, the fluid is accelerated at the feeding port, the centrifugal strength in the hydrocyclone is enhanced, and the fine particle separation in the hydrocyclone is more effective. Specifically, the overflow sludge discharge port extends to 0.7-0.8 of the height of the cylindrical section, and the diameter of the overflow sludge discharge port is 0.1-0.3 of the diameter of the cylindrical section; the diameter of the sand discharge opening is 0.1-0.25 of the diameter of the cylindrical section.
The sand discharge port of the cyclone separator is communicated to a subsequent sludge dewatering system, the overflow sludge discharge port is communicated with a recycling loop and is connected to the biochemical O/A pool, the recycling loop comprises a sludge storage system 5, a strain preparation system and a strain activation system 1 which are sequentially connected to the overflow sludge discharge port, and the output end of the strain activation system 1 is communicated with the biochemical O/A pool to supplement beneficial microorganisms for wastewater treatment. Preferably, the sludge storage system 5 is provided with a nutrient feeding port for microbial cultivation, and the sludge storage system 5 is bypassed to a biochemical O/A pool to supplement activated sludge rich in beneficial microbes for wastewater treatment. In the embodiment, the activated wet sludge side line preservation technology enables microbial strains in a biochemical system to quickly proliferate, can be directly returned to a biochemical tank for sewage treatment, and quickly recovers abnormal states caused by organic matters or inhibitory impact loads, hydraulic load excess and the like.
The strain preparation system comprises a dehydration unit 6, a drying unit 7 and a grinding unit which are sequentially connected in the sludge flowing direction, wherein the dehydration unit 6 is communicated with an inlet pipe for supplying soluble starch, milk powder, glycerol and a composite carrier, and the grinding unit is communicated with an outlet pipe for conveying a solid microbial agent. In this embodiment, the mixed material liquid entering the dehydration unit 6 is rotated at a high speed, and the activated sludge and the carrier are sufficiently mixed while dehydrating.
In one embodiment, the drying unit 7 includes a conveyor belt, a feeding hopper disposed at one end of the conveyor belt corresponding to the sludge outlet of the dewatering unit 6, rake teeth reciprocating along the conveyor belt longitudinally to distribute sludge uniformly on the conveyor belt, and a hot air duct disposed around the conveyor belt for spiral air intake. In the embodiment, the mixed sludge from the sludge dewatering equipment falls onto the conveying belt through the feeding hopper, and the sludge is uniformly distributed on the conveying belt by the rake teeth moving back and forth along the longitudinal direction of the conveying belt, so that the sludge is prevented from being accumulated to cause uneven drying, agglomeration and the like; the sludge is driven forward by the conveying belt, the moving speed and the moving direction of the conveying belt are adjustable, and the conveying belt can be adjusted according to the water content of the sludge at the outlet so as to control the sludge drying time; the conveying belt is provided with a hot air pipeline, hot air (steam, hot flue gas or hot air and the like) enters the sludge drying equipment from an inlet of the hot air pipeline, the hot air is not in direct contact with the sludge, fine particles and dust separated from the heated sludge in the drying process can be prevented from being blown by the hot air, and the dust hazard is reduced.
The method modifies the high-inorganic-rate sludge by adopting an ultrasonic and mechanical stirring combined action mode, quickly destroys the organic polymers and zoogloea of the loose and combined sludge by utilizing the ultrasonic cavitation effect on the premise of not influencing the microbial activity, releases the inorganic particles wrapped in the sludge, and can fully drop the released inorganic particles by combining stirring and mixing to strengthen the separation effect.
The preparation production of the microbial agent is carried out by using the sludge as the raw material, so that a new resource way can be provided for the factory sludge, the excess sludge treatment cost is reduced, the microbial agent is sold to increase the income, and the preparation cost of the industrial microbial agent can be greatly reduced.
The application provides a high inorganic rate mud inorganic matter separation and resourceization technology, includes the step:
pumping the coal gasification wastewater treated by the biochemical O/A tank into a secondary sedimentation tank for solid-liquid separation, outputting high inorganic rate sludge, sending the sludge to a heavy sludge modification system 3, fully releasing and falling inorganic particles wrapped by zoogloea under the combined action of an ultrasonic unit and a stirring unit, and simultaneously not influencing the microbial retention of the sludge, and pumping the mixed sludge to a cyclone separator to sort out light sludge and heavy sludge according to the difference of silt and sludge in particle size and density;
the separated heavy sludge is treated by a sludge dewatering system and then transported outside, the separated light sludge is sequentially cultured and proliferated by a sludge storage system 5, a strain preparation system is used for concentrating and drying to prepare a solid microbial agent, and a strain activation system 1 is used for adding nutrients to activate the solid microbial agent and recycling the solid microbial agent to a biochemical O/A pool to supplement beneficial microorganisms for wastewater treatment.
In some embodiments, the ultrasonic wave band of the ultrasonic unit is 20kHz-30kHz, the hydraulic retention time is 5-15min, and the acoustic energy density during ultrasonic treatment is 0.1-2W/ml, after ultrasonic treatment is performed in the conditions, observation by an optical microscope shows that the activated sludge floc structure is destroyed, the sludge floc size is greatly reduced, inorganic particles wrapped by micellar are obviously reduced, and biological activity can be observed, which indicates that the sludge activity is not destroyed, but the inorganic particles cannot be effectively released when the reaction is performed under given conditions, and biological cell rupture and dissolution can occur when the reaction is performed under the given conditions, so that the sludge is inactivated.
In some embodiments, the feeding speed of the cyclone separator is 8-12m/s, the feeding pressure is 0.1-0.25Mpa, the VSS/SS of the upper layer of the separated light sludge exceeds 70%, inorganic particles with the particle size of more than 30 microns are basically not observed under an optical microscope, the removal rate of the heavy sludge modification unit and the light sludge separation unit under the combined action on inorganic particles with the particle size of more than or equal to 30 microns exceeds 90%, the removal rate of fine inorganic particles with the particle size of less than 30 microns is about 5% -10%, and the biological activity is good after treatment.
In some embodiments, sludge storage system 5 is cultured to proliferate by feeding nutrients including carbon, nitrogen, phosphorus and trace elements, and sludge storage system 5 is connected back to biochemical O/a tank to replenish activated sludge rich in beneficial microorganisms for wastewater treatment. Wherein, the retention time of the sludge storage system 5 for culture and proliferation is 2-4h, the temperature is 25-35 ℃, the pH value is 6-8, when the biochemical treatment tank has an abnormal state caused by organic matters or inhibitory impact load, hydraulic load excess and the like, the sludge in the sludge storage system 5 can be directly returned to the front biochemical tank for emergency use, and the system stability can be quickly recovered.
In some embodiments, the steps of concentrating and drying the strain preparation system to obtain the solid microbial agent are as follows: the water content of the sludge after the activated sludge rich in microorganisms is centrifugally concentrated is 91-93%, then soluble starch, milk powder, glycerol and a composite carrier are added and uniformly stirred, the sludge is dried at 40-60 ℃ until the water content is about 30%, and then the sludge is ground and screened by a grinding machine to prepare the solid microbial agent. The centrifugal concentration mode designed in the embodiment has small occupied area, high concentration speed and no need of adding flocculating agent for tempering; the composite carrier is composed of one or more of biochar, bran and wood chips, and in order to enable the carrier material and the microbial agent to be fully mixed, the average particle size of the solid carrier material is preferably smaller than 60 meshes.
In some embodiments, the step of adding the nutrient-activating solid microbial agent to the strain activating system 1 is as follows: adding diluted sewage, a carbon source, a nitrogen source and a phosphorus source into the solid microbial agent for aeration culture and activation, wherein the sewage is diluted by 2-10 times, and the concentration of the sewage which is difficult to be biochemically diluted can be gradually increased for adaptive activation culture; the activation time is 12-72h, the temperature is 25-35 ℃, and the oxygen content is 2-3 mg/L; wherein the carbon source is selected from one or more of glucose, sucrose, methanol and beef extract; the nitrogen source is selected from ammonium chloride and/or peptone; the phosphorus source is potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.
The method can realize effective separation of light and heavy sludge, and can be used for preparing the solid microbial agent by concentrating and drying the light sludge, is used for pertinently treating high inorganic rate wastewater in an economic sale or recycling biochemical pool, and has the advantages of simple process, mild conditions and easy equipment acquisition.
Example 1
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is crushed by an ultrasonic device, ultrasonic waves are adopted in an ultrasonic inorganic particle release unit at 20kHz, the sound energy density during ultrasonic treatment is 0.12W/ml, and the treatment time is 15 min. And carrying out cyclone separation on the activated sludge subjected to ultrasonic treatment to obtain 75.1% of upper overflow sludge VSS/SS and 13.4% of underflow sludge VSS/SS, wherein the separation effect is obvious.
And (3) putting the upper overflow sludge into a beaker, adding a carbon source, a nitrogen source and a phosphorus source, wherein the carbon source is glucose and methanol, the nitrogen source is ammonium chloride, the phosphorus source is sodium dihydrogen phosphate, and culturing for 4 hours at the temperature of 32 ℃, the pH value of 7.2 and the oxygen content of 2 mg/L. Filtering the cultured activated sludge, adding soluble starch, glycerol and activated carbon powder, mixing, oven drying at 50 deg.C, and measuring water content to 28%. Grinding into powder, and sealing for storage.
Adding a microbial inoculum which is placed for one month into the petrochemical wastewater after being diluted by three times, and performing treatment according to the following steps of C: n: p mass ratio 100: 5: 1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, the pH value at 7 and the oxygen content at 2mg/L, culturing, measuring COD every day, supplementing a carbon source to the initial COD value, wherein the COD removal rate on the first day is 67%, the COD removal rate on the second day is 85%, and the COD removal rate on the third day is 92%. The bacteria agent is activated and has good effect of removing COD.
Example 2
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is crushed by an ultrasonic device, ultrasonic waves are adopted in an ultrasonic inorganic particle release unit at 20kHz, the sound energy density during ultrasonic treatment is 0.2W/ml, and the treatment time is 15 min. And carrying out cyclone separation on the activated sludge subjected to ultrasonic treatment to obtain 81.4% of upper overflow sludge VSS/SS and 12.1% of underflow sludge VSS/SS, wherein the separation effect is obvious.
And (3) putting the upper overflow sludge into a beaker, adding a carbon source, a nitrogen source and a phosphorus source, wherein the carbon source is glucose, sucrose and beef extract, the nitrogen source is ammonium chloride, and the phosphorus source is disodium hydrogen phosphate, and culturing for 4 hours at the temperature of 32 ℃, the pH value of about 7 and the oxygen content of 2 mg/L. Filtering the cultured activated sludge, adding milk powder, glycerol and bran, mixing, oven drying at 50 deg.C, and measuring water content to be 24%. Grinding into powder, and sealing for storage.
Adding a microbial inoculum which is placed for one month into the petrochemical wastewater after being diluted by three times, and performing treatment according to the following steps of C: n: p mass ratio 100: 5: 1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, the pH value at 7 and the oxygen content at 2mg/L, culturing, measuring COD every day and supplementing a carbon source to the initial COD value, wherein the COD removal rate on the first day is 75 percent, the COD removal rate on the second day is 89 percent, and the COD removal rate on the third day is 93 percent. The bacteria agent is activated and has good effect of removing COD.
Example 3
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is crushed by an ultrasonic device, ultrasonic waves are adopted in an ultrasonic inorganic particle release unit at 20kHz, the sound energy density during ultrasonic treatment is 0.2W/ml, and the treatment time is 10 min. And carrying out cyclone separation on the activated sludge subjected to ultrasonic treatment to obtain 76.4% of upper overflow sludge VSS/SS and 12.9% of underflow sludge VSS/SS, wherein the separation effect is obvious.
And (3) putting the upper overflow sludge into a beaker, adding a carbon source, a nitrogen source and a phosphorus source, wherein the carbon source is glucose and beef extract, the nitrogen source is ammonium chloride and peptone, and the phosphorus source is disodium hydrogen phosphate, and culturing for 4 hours at the temperature of 32 ℃, the pH value of about 7 and the oxygen content of 2 mg/L. Filtering the cultured activated sludge, adding soluble starch, milk powder, glycerol and bran, mixing, oven drying at 50 deg.C, and measuring water content to be 32%. Grinding into powder, and sealing for storage.
Adding a microbial inoculum which is placed for one month into the petrochemical wastewater after being diluted by three times, and performing treatment according to the following steps of C: n: p mass ratio 100: 5: 1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, the pH value at 7 and the oxygen content at 2mg/L, culturing, measuring COD every day and supplementing a carbon source to the initial COD value, wherein the COD removal rate on the first day is 79 percent, the COD removal rate on the second day is 89 percent, and the COD removal rate on the third day is 95 percent. The bacteria agent is activated and has good effect of removing COD.
Comparative example 1
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. Active sludge is separated by adopting a cyclone separator, so that 21.2 percent of upper overflow sludge VSS/SS and 20.8 percent of bottom flow sludge VSS/SS are obtained, and the separation effect is poor.
Comparative example 2
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is subjected to crushing treatment by adopting an ejector and then is kept stand, after the 2L of activated sludge is kept stand for 2 hours, the VSS/SS measured by taking the sludge at the upper layer is 20.95%, the VSS/SS measured by taking the sludge at the lower layer is 20.91%, and basically no separation effect exists.
Comparative example 3
The coal gasification water is taken to treat Baotou activated sludge, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in a colloidal cenobium through microscope observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is crushed by adopting an ejector and then is subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 22.6%, the bottom flow sludge VSS/SS is 20.1%, and the separation effect is poor.
Comparative example 4
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is treated by using 1mm and 2mm pore plates respectively and then is subjected to cyclone separation, so that 21.1 percent of upper overflow sludge VSS/SS and 20.8 percent of underflow sludge VSS/SS are obtained, and the separation effect is poor.
Comparative example 5
The activated sludge treated by the coal gasification water is taken, and a large amount of calcium carbonate particles in the activated sludge are found to be wrapped in the colloidal cenobium through microscope observation, wherein the sludge SS is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. 2L of activated sludge is crushed by an ultrasonic device, ultrasonic waves are adopted in an ultrasonic inorganic particle release unit at 20kHz, the sound energy density during ultrasonic treatment is 0.3W/ml, and the treatment time is 30 min. The original sludge and the ultrasonic-treated sludge with the same volume are taken, the COD removal effect is inspected, the COD removal rate of the original sludge after 4 hours is 68%, and the COD removal rate of the ultrasonic-treated sludge after 4 hours is 21%, which indicates that the sludge is inactivated due to the ultrasonic.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
It should be noted that although the control method has been described above with reference to specific sequences of steps, those skilled in the art will appreciate that the various steps are not necessarily performed in such a sequence, and may be performed simultaneously (in parallel) or in other sequences to achieve the effects of the present invention, and that such variations are within the scope of the present invention.
Claims (10)
1. A high inorganic rate sludge inorganic matter separation and resource system comprises an O/A tank and a secondary sedimentation tank which are sequentially connected by pipelines, so that coal gasification wastewater entering a biochemical treatment system is treated by the O/A tank and then is subjected to solid-liquid separation in the secondary sedimentation tank to output high inorganic rate sludge,
the system also comprises a heavy sludge modification system and a light and heavy sludge separation system, wherein the heavy sludge modification system is connected in sequence along the sludge flowing direction and is used for releasing and falling small-particle inorganic substances coated by zoogloea under the condition of not influencing the microbial activity, the light and heavy sludge separation system is used for separating silt and sludge according to the difference of particle size and density, and the separated heavy sludge is conveyed into a sludge dewatering system for treatment and then is transported outside for disposal;
and the separated part or all of the light sludge is recycled to the biochemical O/A pool through a recycling loop, the recycling loop comprises a sludge storage system, a strain preparation system and a strain activation system which are sequentially connected to the light sludge output end of the sludge separation system, and the output end of the strain activation system is connected to the biochemical O/A pool to supplement beneficial microorganisms for wastewater treatment.
2. The inorganic matter separation and resource system for high inorganic rate sludge as claimed in claim 1,
the heavy sludge modification system comprises an ultrasonic unit and a stirring unit which act on the sludge together, wherein the ultrasonic unit utilizes cavitation effect to quickly release small-particle inorganic substances coated by zoogloea, and the stirring unit is used for promoting the release of the released inorganic substances.
3. The inorganic matter separation and resource system for high inorganic rate sludge as claimed in claim 1,
the light and heavy sludge separation system is provided with a cyclone separator, the cyclone separator comprises an upper cylindrical section and a lower conical section, mixed sludge is input into an inner cavity of the cyclone separator through a feed inlet tangential to the wall surface of the cylindrical section, an overflow sludge discharge port with adjustable insertion depth is installed at the top end of the cyclone separator, and a sand discharge port is arranged at the bottom end of the cyclone separator.
4. The inorganic matter separation and resource system for high inorganic rate sludge as claimed in claim 3, wherein,
the overflow sludge discharge port extends to 0.7-0.8 of the height of the cylindrical section, and the diameter of the overflow sludge discharge port is 0.1-0.3 of the diameter of the cylindrical section; the diameter of the sand discharge opening is 0.1-0.25 of the diameter of the cylindrical section.
5. The inorganic matter separation and resource system for high inorganic rate sludge as claimed in claim 1,
the sludge storage system is provided with a nutrient feeding port for microbial culture, and the sludge storage system bypasses to the biochemical O/A pool to supplement the activated sludge rich in beneficial microbes for wastewater treatment.
6. A high inorganic rate sludge inorganic matter separation and resource technology is characterized by comprising the following steps:
pumping the coal gasification wastewater treated by the biochemical O/A tank into a secondary sedimentation tank for solid-liquid separation, outputting high inorganic rate sludge, sending the sludge to a heavy sludge modification system, fully releasing and falling inorganic particles wrapped by zoogloea under the combined action of an ultrasonic unit and a stirring unit, and simultaneously not influencing the microbial retention of the sludge, and pumping mixed sludge to a cyclone separator to sort out light sludge and heavy sludge according to the difference of silt and sludge in particle size and density;
the separated heavy sludge is treated by a sludge dewatering system and then transported out, the separated light sludge is cultured and proliferated by a sludge storage system in sequence, a strain preparation system is used for concentrating and drying to prepare a solid microbial agent, and a strain activation system is used for adding nutrients to activate the solid microbial agent and recycling the solid microbial agent to a biochemical O/A (oxygen/oxygen) pool to supplement beneficial microorganisms for wastewater treatment.
7. The inorganic matter separation and resource utilization process for sludge with high inorganic rate as claimed in claim 6, wherein,
the ultrasonic unit adopts an ultrasonic wave band of 20kHz-30kHz, the hydraulic retention time is 5-15min, and the sound energy density during ultrasonic treatment is 0.1-2W/ml; and/or the presence of a gas in the gas,
the stirring unit is provided with a stirrer which is eccentrically arranged to enhance axial mixing of sludge; and/or the presence of a gas in the gas,
the feeding speed of the cyclone separator is 8-12m/s, and the feeding pressure is 0.1-0.25 MPa.
8. The inorganic matter separation and resource utilization process for sludge with high inorganic rate as claimed in claim 6, wherein,
the sludge storage system is cultured and proliferated by throwing nutrients, the nutrients comprise a carbon source, a nitrogen source, a phosphorus source and trace elements, the sludge storage system is connected back to the biochemical O/A pool to supplement activated sludge which is used for wastewater treatment and is rich in beneficial microorganisms,
the retention time of the sludge storage system for culture and proliferation is 2-4h, the temperature is 25-35 ℃, and the pH value is 6-8.
9. The inorganic substance separation and resource process for sludge with high inorganic rate as claimed in claim 6, wherein the concentration and drying of the strain preparation system to obtain the solid microbial agent comprises the following steps:
centrifugally concentrating the activated sludge rich in microorganisms, adding soluble starch, milk powder, glycerol and a composite carrier, uniformly stirring, drying at 40-60 ℃, grinding by a grinding machine, and screening to obtain the solid microbial agent.
10. The inorganic matter separation and resource process for sludge with high inorganic rate as claimed in claim 6, wherein the specific steps of feeding nutrient activation solid microbial agent by the strain activation system are as follows:
adding diluted sewage, a carbon source, a nitrogen source and a phosphorus source into a solid microbial agent for aeration culture activation, wherein the sewage is diluted by 2-10 times, the activation time is 12-72 hours, the temperature is 25-35 ℃, and the oxygen content is 2-3 mg/L;
the carbon source is selected from one or more of glucose, sucrose, methanol and beef extract; the nitrogen source is selected from ammonium chloride and/or peptone; the phosphorus source is potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.
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