CN114853185B - System and process for separating and recycling inorganic matters of high-inorganic-rate sludge - Google Patents

Abstract

The invention relates to a system and a process for separating and recycling inorganic matters of high-inorganic-rate sludge. The technology comprises the steps of fully shedding inorganic particles wrapped by zoogloea under the combined action of an ultrasonic unit and a stirring unit from high-inorganic-rate sludge which is processed by a biochemical O/A tank and enters a secondary sedimentation tank for solid-liquid separation, and sending the 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 and disposed, the separated light sludge is sequentially cultured and proliferated by a sludge storage system, a strain preparation system is concentrated and dried to prepare a solid microbial agent, and a strain activation system activates the solid microbial agent and is recycled to a biochemical O/A pool. The method performs light-heavy separation on the sludge in the biochemical pond, improves the activity, biochemical treatment capacity and efficiency of the sludge, prepares the desiccation strain by using the activated light sludge, saves and utilizes the desiccation strain, and provides a new recycling utilization path for the surplus sludge.

Description

System and process for separating and recycling inorganic matters of high-inorganic-rate sludge

Technical Field

The invention belongs to the technical field of sludge treatment and disposal, and particularly relates to a high-inorganic-rate sludge inorganic matter separation and recycling system and process.

Background

The coal chemical industry of using coal gas as tap is developed, clean energy chemical products such as methanol, glycol, synthetic oil, dimethyl ether and the like are produced, and further development is deepened, thus being a strategic requirement for economic development in China. The sewage produced by coal gasification has the characteristic of high hardness, and brings a plurality of technical difficulties for biochemical treatment of sewage in coal chemical industry. The sewage biochemical unit comprises an A tank and an O tank, the activated sludge MLSS comprises an organic component and an inorganic component, wherein the organic component MLVSS indirectly reflects the amount of active microorganisms in the sludge, the activity of the sludge is evaluated by using the MLVSS/MLSS ratio in the operation regulation of a sewage plant, the MLVSS/MLSS ratio of the activated sludge for treating domestic sewage is generally about 0.75, the difference of the MLVSS/MLSS ratio is larger according to different water qualities for industrial sewage, the inorganization condition of the activated sludge in the biochemical tank is serious due to the high calcium-magnesium hardness of the water quality of coal gasification wastewater, the MLVSS is low, the MLVSS/MLSS is usually only 0.3-0.5 and even as low as 0.2, wherein the calcium carbonate content in the inorganic matters accounts for about 85-90%, and the inorganic matters in the sludge often cause the following problems:

1. when a large amount of inorganic particles in the activated sludge mixed liquor are accumulated to cause the decrease of MLVSS/MLSS, in order to ensure the level of active microorganisms in the sludge, the sewage plant has to increase the concentration of the sludge to ensure the treatment effect, thereby reducing the sludge discharge, and the reduction of the sludge discharge causes the aggravation accumulation of the inorganic particles, so that the concentration of the sludge is higher and higher in the vicious circle, the sediment accumulation at the bottom of the biochemical pool is obvious, and the dredging frequency of the sewage plant is increased;

2. the deposition of inorganic particles in the biochemical tank reduces the effective volume of the tank, so that the residence time of sewage in the tank is reduced, and the sewage treatment efficiency is reduced;

3. the biochemical sludge has high inorganization rate, low MLVSS, low microorganism retention in a biochemical pond, low treatment capacity and efficiency, high energy consumption of oxygenation equipment, weak water impact resistance, slow recovery of a biochemical system after maintenance or impact, and difficult sludge inoculation retention;

4. the sludge with high sand content can reduce the cake forming rate of the sludge during dehydration, and lead the filter cloth of the filter press to be excessively worn and the service life to be shortened;

5. when the sludge with high sand content is conveyed, the end part of the pump shell and the steel pipeline elbow is easier to grind through;

6. the excess sludge with high sand content has low gas yield and sludge heat value, improves the incineration cost of the sludge, and restricts the treatment of the excess sludge.

How to effectively remove fine silt in activated sludge is a problem to be solved in a sewage treatment system. CN201610406098.X proposes a method and apparatus for concentrating and separating coal-containing sludge, which uses the air floatation principle to realize heavy sludge, light sludge concentration and clear liquid separation by one-step treatment, but because fine silt in the sludge is caught by activated sludge flocs, the air floatation can only treat uncoated inorganic sludge, and can not solve the problem of poor treatment effect of small-particle inorganic matters coated by microorganisms such as bacteria; the CN20110159013. X provides a separator suitable for removing silt in activated sludge of a sewage treatment plant, and the separator utilizes the difference of the silt and the sludge in particle size and density to enable the silt and the sludge to generate different gyration radiuses in the rotating process so as to separate the silt and the sludge, and the method also cannot effectively separate small-particle inorganic matters coated by zoogloea, so that the treatment effect is poor.

CN201811010056.X proposes a kind of mud desanding craft and system, carry on the slurry reaction sequentially, hydrothermal reaction and flash evaporation reaction and carry on the rotational flow desanding; CN200910227265.4 proposes a method for decomposing sludge by ultrasonic-magnetic field coupling to reduce the sludge, and the residual sludge is mainly in a reactor provided with ultrasonic and magnetic field devices, so that ultrasonic cavitation effect generated by ultrasonic waves and magneto-chemical effect generated by magnetic fields are organically combined together, and the effect of decomposing sludge by ultrasonic waves is greatly enhanced; CN201611176156.0 proposes a device and process for reducing sludge by combining ultrasonic fillers, and ultrasonic waves generate powerful shearing force, so that the particle size of sludge particles is reduced, the specific surface area of the particles is increased, and the device and process are suitable for absorption and utilization of microorganism in subsequent unit reduction; and more carbon sources can be dissolved to provide for the reduction of microorganism proliferation, so that the sludge reduction is realized to a high degree. The main purpose of the separation method is to achieve the effect of sludge reduction by removing microorganisms in the sludge, destroy organic matters in the activated sludge, and cannot realize the recycling of the organic sludge.

Therefore, there is a need to develop an inorganic separation technique for high inorganic rate sludge, which reduces inorganic particles in activated sludge, and realizes the recycling of sludge.

Disclosure of Invention

In one aspect, the invention provides a high-inorganic-rate sludge inorganic matter separation and recycling system which is used for effectively separating sludge in a biochemical pond in a light-weight manner, so that the activity, biochemical treatment capacity and efficiency of the sludge are improved, and meanwhile, dried bacteria prepared from activated light-weight sludge are stored and utilized, so that a new recycling utilization way of excess sludge is provided, and the system has economical efficiency and high-efficiency sewage and wastewater treatment capacity.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

a system for separating inorganic substances from high-inorganic-rate sludge and recycling the same comprises an O/A tank and a secondary sedimentation tank which are connected in sequence by pipelines, so that coal gasification wastewater entering a biochemical treatment system is treated by the O/A tank and then 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 for releasing and falling off small-particle inorganic matters coated by zoogloea and a light and heavy sludge separation system for separating by utilizing the difference of the particle size and the density of silt and sludge, wherein the small-particle inorganic matters are sequentially connected along the flowing direction of the sludge, and the separated heavy sludge is conveyed to a sludge dewatering system for treatment and then is transported to the outside for treatment;

and recycling part or all of the separated light sludge to a biochemical O/A tank through a recycling loop, wherein 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 a sludge separation system, and the output end of the strain activation system is connected back to the biochemical O/A tank to supplement beneficial microorganisms for wastewater treatment.

In some embodiments, the heavy sludge modification system includes an ultrasonic unit that acts together with the sludge to rapidly release small particle inorganic matter coated with zoogloea using cavitation effect, and a stirring unit for promoting shedding of the released inorganic matter.

In some embodiments, the light and heavy sludge separation system is provided with a cyclone separator, the cyclone separator comprises a cylindrical section at the upper part and a conical section at the lower part, mixed sludge is input into the 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 into the cylindrical section from 0.7 to 0.8 in height, and the diameter of the overflow sludge discharge port is from 0.1 to 0.3 in 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 holding system is provided with a nutrient delivery port for microbial cultivation, and the sludge holding system bypasses the biochemical O/a tank to replenish activated sludge enriched in beneficial microorganisms for wastewater treatment.

On the other hand, the invention provides a high-inorganic-rate sludge inorganic separation and recycling process, which can realize the effective separation of light and heavy sludge, and concentrate and dry the light sludge to prepare the solid microbial agent for the targeted treatment of high-inorganic-rate wastewater in an economic selling or recycling biochemical pond, and has the advantages of simple process, mild condition and easily obtained equipment.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

a process for separating inorganic matters from sludge with high inorganic rate and recycling the sludge comprises the following steps: the coal gasification wastewater treated by the biochemical O/A tank is pumped into a secondary sedimentation tank for solid-liquid separation, then output Gao Moji-rate sludge, and the sludge is sent to a heavy sludge modification system, so that inorganic particles wrapped by zoogloea can be fully released and shed under the combined action of an ultrasonic unit and a stirring unit, meanwhile, the microorganism retention amount of the sludge is not influenced, and then the mixed sludge is pumped into a cyclone separator to separate light sludge and heavy sludge according to the difference of the silt and the sludge in particle size and density;

the separated heavy sludge is treated by a sludge dewatering system and then is transported and disposed, the separated light sludge is sequentially cultured and proliferated by a sludge storage system, a strain preparation system is concentrated and dried 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 tank so as to supplement beneficial microorganisms for wastewater treatment.

In some embodiments, the ultrasonic unit adopts ultrasonic wave band of 20kHz-30kHz, hydraulic retention time of 5-15min, and acoustic energy density of 0.1-2W/ml during ultrasonic treatment; and/or the number of the groups of groups,

the stirring unit is provided with a stirrer which is eccentrically arranged to enhance axial mixing of the sludge; and/or the number of the groups of groups,

the feeding speed of the cyclone separator is 8-12m/s, and the feeding pressure is 0.1-0.25MPa.

In some embodiments, the invention provides a method for culturing and proliferating the sludge storage system by adding 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 a biochemical O/A tank to supplement active sludge rich in beneficial microorganisms for wastewater treatment, the residence time of the culturing and proliferating of the sludge storage system is 2-4 hours, the temperature is 25-35 ℃, and the pH value is 6-8.

In some embodiments, the invention provides a method for preparing a solid microbial agent by concentrating and drying the strain preparation system, which comprises the following specific steps: and (3) 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 pulverizer, and screening to obtain the solid microbial agent.

In some embodiments, the invention provides the specific steps of putting the nutrient activated solid microbial agent into the strain activation system, which 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 12-72h, the temperature is 25-35 ℃, and the oxygen content is 2-3mg/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 selected from potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.

The technical scheme adopted by the invention has at least the following beneficial effects:

1. modifying the high-inorganic-rate sludge by adopting a combined action mode of ultrasonic and mechanical stirring, and rapidly destroying loosely-combined organic polymers and zoogloea of the sludge by utilizing an ultrasonic cavitation effect on the premise of not influencing the microbial activity, so that inorganic particles wrapped in the sludge are released, and the released inorganic particles can be fully shed by combining stirring and mixing to strengthen the separation effect;

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 of the sludge and the biochemical treatment capacity and efficiency are improved, and the scaling of heavy sludge to biochemical system equipment and pipelines and the energy consumption of the equipment caused by the scaling are reduced;

3. the side line preservation technology of the activated wet sludge enables microorganism strains of a biochemical system to proliferate rapidly, and the microorganism strains can be directly returned to a biochemical tank for sewage treatment, so that abnormal states caused by organic matters or inhibitory impact load, excessive hydraulic load and the like can be recovered rapidly;

4. the preservation technology of the activated sludge drying strain comprises the steps of concentrating and dehydrating the activated sludge rich in microorganisms, drying at low temperature, preparing a solid microbial inoculum, and preserving for a long time at normal temperature;

5. the activated sludge has strong adaptability to microorganisms and various microorganism types, contains various protozoa, solves the problem of shortage of high-quality activated sludge in sewage plants, and can purify various sewage and wastewater with high efficiency and pertinence;

6. the preparation and production of the microbial agent are carried out by taking the sludge as the raw material, so that a new resource way can be provided for the factory sludge, the treatment cost of the surplus sludge is reduced, the income of selling the microbial agent is increased, and the preparation cost of the industrial microbial agent can be greatly reduced.

Drawings

For a clearer description of the technical solutions of the embodiments of the present invention, reference will be made to the drawings and the signs used in the embodiments, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of a system for separating and recycling inorganic matters from sludge with high inorganic rate according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a system for separating inorganic substances from sludge and recycling sludge with high inorganic rate according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a feed inlet of a cyclone separator according to an embodiment of the invention.

The illustrations are marked as follows:

1-strain activation system, 2-biochemical treatment system, 3-heavy sludge modification system, 4-light and heavy sludge separation system, 5-sludge storage system, 6-dehydration unit and 7-drying unit.

Detailed Description

The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.

Referring to fig. 1 to 3, the application provides a system for inorganic separation and recycling of high-inorganic-rate sludge, which comprises a biochemical treatment system 2, wherein the biochemical treatment system comprises an O/A tank and a secondary sedimentation tank which are connected through a pipeline in sequence, the water inlet end of an anoxic tank is input with coal gasification wastewater, the 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 the high-inorganic-rate sludge, and the bypass is sequentially connected with a heavy sludge modification system 3 and a light and heavy sludge separation system 4 along the flow direction of the sludge.

The heavy sludge modification system 3 comprises an ultrasonic unit and a stirring unit which jointly act on sludge, and the stirring unit is provided with an eccentrically arranged stirrer. In the embodiment, the strong hydraulic shear force generated by the ultrasonic action can quickly destroy the loosely-combined organic polymer and zoogloea of the sludge, so that inorganic particles wrapped in the sludge are released; the eccentric stirring design can enhance axial mixing, reduce short circuit, enable mixed sludge to be uniformly suspended in water, make full use of ultrasonic action to enable inorganic matters released in zoogloea to fall off, and enhance separation effect. In a specific example, a magnetic stirrer is selected, an external magnetic rotor of the magnetic stirrer is arranged at the bottom of the shell of the heavy sludge modification system 3, and a stirring paddle is arranged at the upper end of the internal magnetic stirrer rotor, so that the magnetic stirrer has a simple integral structure and is convenient to maintain.

In a preferred embodiment, the heavy sludge modification system 3 adopts a shell of a closed double sound insulation steel structure, and vacuum is pumped between two layers of steel structures to achieve the purpose of sound insulation, so that the damage of ultrasonic waves to operators is prevented; wherein the top of the shell of the heavy sludge modification system 3 is detachably maintained, and the top is connected with the shell by adopting 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 conveniently observed.

The light and heavy sludge separation system 4 is provided with a cyclone separator, the cyclone separator comprises a cylindrical section at the upper part and a conical section at the lower part, 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 this embodiment, the mixed sludge enters the separator tangentially from the feed inlet, the sludge rotates in the cavity to generate a spiral flow, the inorganic particles move to the wall surface of the cylindrical section and are discharged from the bottom of the cyclone separator as an underflow along with the outer cyclone due to the larger centrifugal force, and the light activated sludge is discharged from the upper overflow port along with the inner cyclone due to the smaller centrifugal force and is not settled, so that the light activated sludge and the heavy inorganic matters are separated.

In a preferred embodiment, the cyclone separator is a medium-diameter and small-diameter hydrocyclone, the cone angle is 10-15 degrees, and meanwhile, a rectangular involute feed pipe is adopted, so that larger local resistance caused by fluid turning loss, vortex loss and the like can be reduced, the fluid is accelerated at the feed inlet, the centrifugal strength in the hydrocyclone is enhanced, and the fine particles in the hydrocyclone are more effectively separated. Specifically, the overflow mud discharging opening is deep to 0.7-0.8 of the height of the cylindrical section, and the diameter of the overflow mud discharging opening 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 with a subsequent sludge dewatering system, the overflow sludge discharge port is communicated with a recycling loop which is connected back to the biochemical O/A tank, 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 tank to supplement beneficial microorganisms for wastewater treatment. Preferably, the sludge storage system 5 is provided with a nutrient feeding port for microorganism culture, and the sludge storage system 5 is bypassed to the biochemical O/A tank to supplement activated sludge rich in beneficial microorganisms for wastewater treatment. The side line preservation technology of the activated wet sludge in the embodiment ensures that microorganism strains of a biochemical system are rapidly proliferated, and the microorganism strains can be directly returned to a biochemical tank for sewage treatment, so that abnormal states caused by organic matters or inhibitory impact load, excessive hydraulic load and the like can be rapidly recovered.

The strain preparation system comprises a dehydration unit 6, a drying unit 7 and a grinding unit which are sequentially connected in the flowing direction of sludge, 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 solid microbial agents. In this embodiment, the mixed liquid entering the dewatering unit 6 is rotated at a high speed, and the activated sludge and the carrier are sufficiently and uniformly mixed while being dewatered.

In a specific embodiment, the drying unit 7 comprises a conveying belt, a feeding funnel arranged at one end of the conveying belt and corresponding to the sludge outlet of the dewatering unit 6, rake teeth which longitudinally reciprocate along the conveying belt to uniformly distribute the sludge on the conveying belt, and a hot air pipeline which is arranged at the peripheral side of the conveying belt and is used for spirally feeding air. In the embodiment, the mixed sludge from the sludge dewatering equipment falls onto a conveying belt through a feeding funnel, and the sludge is uniformly distributed on the conveying belt by longitudinally moving back and forth along the conveying belt through the rake teeth, so that uneven drying, agglomeration and the like caused by sludge accumulation are prevented; the sludge is driven to move forward by the conveying belt, the movement speed and the movement 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 outside of the transmission 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 the inlet of the hot air pipeline, and the hot air is not in direct contact with the sludge, so that fine particles and dust can be prevented from being dissociated after the sludge is heated in the drying process and blown up by the hot air, and the dust hazard is reduced.

The method adopts the combined action mode of ultrasonic and mechanical stirring to modify the high-inorganic-rate sludge, utilizes the ultrasonic cavitation effect to quickly destroy the loosely-combined organic polymer and zoogloea of the sludge on the premise of not influencing the microbial activity, so that inorganic particles wrapped in the sludge are released, and the released inorganic particles can be fully fallen off by combining stirring and mixing, thereby strengthening the separation effect.

The method utilizes the sludge as the raw material to prepare and produce the microbial agent, not only can provide a new recycling way for the factory sludge and reduce the treatment cost of the surplus sludge, but also can greatly reduce the preparation cost of the industrial microbial agent.

The application provides a high-inorganic-rate sludge inorganic matter separation and recycling process, which comprises the following steps:

the coal gasification wastewater treated by the biochemical O/A tank is pumped into a secondary sedimentation tank for solid-liquid separation, then output Gao Moji-rate sludge, and the sludge is sent to a heavy sludge modification system 3, inorganic particles wrapped by zoogloea can be fully released and fall off under the combined action of an ultrasonic unit and a stirring unit, meanwhile, the microorganism retention amount of the sludge is not influenced, and then the mixed sludge is pumped into a cyclone separator to separate light sludge and heavy sludge according to the difference of the silt and the sludge in particle size and density;

the separated heavy sludge is treated by a sludge dewatering system and then is transported and disposed, the separated light sludge is sequentially cultured and proliferated by a sludge storage system 5, a strain preparation system is concentrated and dried to prepare a solid microbial agent, and a strain activation system 1 is used for adding nutrient activated solid microbial agent and recycling the solid microbial agent to a biochemical O/A tank 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, the acoustic energy density during ultrasonic treatment is 0.1-2W/ml, after ultrasonic treatment is carried out in the condition, the observation of an optical microscope shows that the structure of activated sludge flocs is destroyed, the size of the sludge flocs is greatly reduced, inorganic particles wrapped by colloid bacteria are obviously reduced, biological activity can be observed, the activity of the sludge is not destroyed, the reaction is carried out below a given condition, the inorganic particles cannot be effectively released, and biological cell rupture and dissolution can occur when the condition is exceeded, so that the sludge is deactivated.

In some embodiments, the cyclone separator has a feeding speed of 8-12m/s and a feeding pressure of 0.1-0.25Mpa, the separated upper light sludge VSS/SS exceeds 70%, inorganic particles with a diameter of more than 30 microns are basically not seen under an optical microscope, the combined action of the heavy sludge modification unit and the light sludge separation unit has a removal rate of more than 90% for inorganic particles with a diameter of more than or equal to 30 microns, and a removal rate of about 5% -10% for fine inorganic particles with a diameter of less than 30 microns, and the treated inorganic particles have good biological activity.

In some embodiments, the sludge holding system 5 is cultured and proliferated by adding nutrients including carbon source, nitrogen source, phosphorus source and trace elements, and the sludge holding system 5 is connected back to the biochemical O/A tank to supplement activated sludge rich in beneficial microorganisms for wastewater treatment. The residence time of the culture and proliferation of the sludge storage system 5 is 2-4 hours, the temperature is 25-35 ℃, the pH value is 6-8, and when the biochemical treatment tank is in an abnormal state caused by organics or inhibitory impact load, excessive hydraulic load and the like, the sludge in the sludge storage system 5 can be directly returned to the front biochemical tank for emergency use, so that the system is quickly restored to be stable.

In some embodiments, the specific steps of the strain preparation system for concentrating and drying to prepare the solid microbial agent are as follows: and (3) centrifugally concentrating the activated sludge rich in microorganisms, wherein the water content of the sludge is 91-93%, adding soluble starch, milk powder, glycerol and a composite carrier, uniformly stirring, drying at 40-60 ℃ until the water content is about 30%, and grinding and sieving by a pulverizer to obtain the solid microbial agent. The centrifugal concentration mode equipment designed in the embodiment has small occupied area, high concentration speed and no need of adding flocculant for tempering; the composite carrier is composed of one or more of biochar, bran and wood dust, and the average particle size of the solid carrier material is preferably less than 60 meshes in order to enable the carrier material to be fully mixed with the microbial agent.

In some embodiments, the specific steps of the strain activation system 1 for delivering the nutrient activated solid microbial agent are: adding diluted sewage, carbon source, nitrogen source and phosphorus source into the solid microbial agent for aeration culture activation, diluting the sewage by 2-10 times, and gradually increasing the concentration of the sewage difficult to be biochemically diluted for adaptive activation culture; the activation time is 12-72h, the temperature is 25-35 ℃, and the oxygen content is 2-3mg/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 selected from potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.

The method can realize the effective separation of light and heavy sludge, and can concentrate and dry the light sludge to prepare the solid microbial agent for the targeted treatment of high-inorganic-rate wastewater in an economic selling or recycling biochemical pond, and has the advantages of simple process, mild condition and easily obtained equipment.

Example 1

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The ultrasonic device is adopted to crush 2L of activated sludge, the ultrasonic wave is adopted in the ultrasonic inorganic particle release unit to be 20kHz, the sonic energy density during ultrasonic treatment is 0.12W/ml, and the treatment time is 15min. The activated sludge after ultrasonic treatment is subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 75.1%, the underflow sludge VSS/SS is 13.4%, and the separation effect is obvious.

Placing the overflow sludge at the upper part 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 maintaining the temperature at 32 ℃, the pH value is 7.2, and the oxygen content is 2mg/L for culturing for 4 hours. Filtering the cultured activated sludge, adding soluble starch, glycerol and activated carbon powder, uniformly mixing, drying at 50 ℃, and measuring the water content to be 28 percent after drying. Grinding into powder, and sealing for storage.

Adding a microbial inoculum which is placed for one month into the petrochemical wastewater after three times dilution, and carrying out the following steps of: n: p mass ratio 100:5:1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, culturing at pH 7 and oxygen content of 2mg/L, measuring COD every day and supplementing carbon source to the initial COD value, wherein the COD removal rate is 67% in the first day, 85% in the second day and 92% in the third day. The microbial inoculum has good COD removal effect after being activated.

Example 2

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The ultrasonic device is adopted to crush 2L of activated sludge, the ultrasonic wave is adopted in the ultrasonic inorganic particle release unit to be 20kHz, the sonic energy density during ultrasonic treatment is 0.2W/ml, and the treatment time is 15min. The activated sludge after ultrasonic treatment is subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 81.4%, the underflow sludge VSS/SS is 12.1%, and the separation effect is obvious.

Placing 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, the phosphorus source is disodium hydrogen phosphate, and maintaining the temperature at 32 ℃, the pH value is about 7, and the oxygen content is 2mg/L for culturing for 4 hours. Filtering the cultured activated sludge, adding milk powder, glycerol and bran, mixing well, drying at 50deg.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 three times dilution, and carrying out the following steps of: n: p mass ratio 100:5:1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, culturing at pH 7 and oxygen content of 2mg/L, measuring COD every day and supplementing carbon source to the initial COD value, wherein the COD removal rate is 75% in the first day, 89% in the second day and 93% in the third day. The microbial inoculum has good COD removal effect after being activated.

Example 3

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The ultrasonic device is adopted to crush 2L of activated sludge, the ultrasonic wave is adopted in the ultrasonic inorganic particle release unit to be 20kHz, the sonic energy density during ultrasonic treatment is 0.2W/ml, and the treatment time is 10min. The activated sludge after ultrasonic treatment is subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 76.4%, the underflow sludge VSS/SS is 12.9%, and the separation effect is obvious.

Placing 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, the phosphorus source is disodium hydrogen phosphate, maintaining the temperature at 32 ℃, the pH value is about 7, and the oxygen content is 2mg/L for culturing for 4 hours. Filtering the cultured activated sludge, adding soluble starch, milk powder, glycerol and bran, mixing well, drying at 50deg.C, and measuring water content as 32%. Grinding into powder, and sealing for storage.

Adding a microbial inoculum which is placed for one month into the petrochemical wastewater after three times dilution, and carrying out the following steps of: n: p mass ratio 100:5:1 adding glucose, ammonium chloride and sodium dihydrogen phosphate, maintaining the temperature at 32 ℃, culturing at pH 7 and oxygen content of 2mg/L, measuring COD every day and supplementing carbon source to the initial COD value, wherein the COD removal rate is 79% in the first day, 89% in the second day and 95% in the third day. The microbial inoculum has good COD removal effect after being activated.

Comparative example 1

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The cyclone separator is adopted to separate the activated sludge, so that the VSS/SS of the overflow sludge at the upper part is 21.2%, the VSS/SS of the underflow sludge is 20.8%, and the separation effect is poor.

Comparative example 2

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. And (3) crushing 2L of activated sludge by using an ejector, standing for 2 hours, taking the upper sludge to measure VSS/SS to be 20.95%, and taking the lower sludge to measure VSS/SS to be 20.91%, wherein the separation effect is basically avoided.

Comparative example 3

The activated sludge of the coal gasification water treatment header is taken, and a large amount of calcium carbonate particles in the activated sludge are wrapped in the colloid bacterial clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The 2L activated sludge is crushed by an ejector and then subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 22.6%, the underflow sludge VSS/SS is 20.1%, and the separation effect is poor.

Comparative example 4

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The 2L activated sludge is treated by a 1mm orifice plate and a 2mm orifice plate and then subjected to cyclone separation, so that the upper overflow sludge VSS/SS is 21.1%, the underflow sludge VSS/SS is 20.8%, and the separation effect is poor.

Comparative example 5

The activated sludge is treated by coal gasification water, and a large amount of calcium carbonate particles in the activated sludge are wrapped in colloid clusters through microscopic observation, wherein the SS of the sludge is 5.83g/L, the VSS is 1.22g/L, and the VSS/SS is 20.93%. The ultrasonic device is adopted to crush 2L of activated sludge, the ultrasonic wave is adopted in the ultrasonic inorganic particle release unit to be 20kHz, the sonic energy density during ultrasonic treatment is 0.3W/ml, and the treatment time is 30min. Taking the same volume of raw sludge and ultrasonic treatment sludge, and observing the COD removal effect, wherein the COD removal rate of the raw sludge after 4 hours is 68%, and the COD removal rate of the sludge after 4 hours is 21%, which indicates that the sludge is deactivated by ultrasonic treatment.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

It should be noted that, although the above control method describes the steps in a specific order, it will be understood by those skilled in the art that, in order to achieve the effects of the present invention, the steps are not necessarily performed in such an order, and may be performed simultaneously (in parallel) or in other orders, and these variations are all within the scope of the present invention.

Claims (7)

1. A process for separating and recycling inorganic matters from sludge with high inorganic rate is characterized by comprising the following steps:

the coal gasification wastewater treated by the biochemical O/A tank is pumped into a secondary sedimentation tank for solid-liquid separation, then output Gao Moji-rate sludge, and the sludge is sent to a heavy sludge modification system, so that inorganic particles wrapped by zoogloea can be fully released and shed under the combined action of an ultrasonic unit and a stirring unit, meanwhile, the microorganism retention amount of the sludge is not influenced, and then the mixed sludge is pumped into a cyclone separator to separate light sludge and heavy sludge according to the difference of the silt and the sludge in particle size and density;

the separated heavy sludge is treated by a sludge dewatering system and then is transported and disposed, the separated light sludge is sequentially cultured and proliferated by a sludge storage system, a strain preparation system is concentrated and dried 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 tank so as to supplement beneficial microorganisms for wastewater treatment;

wherein the ultrasonic wave band adopted by 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.

2. The process for separating and recycling inorganic matters from sludge with high inorganic rate according to claim 1, which is characterized in that,

the stirring unit is provided with a stirrer which is eccentrically arranged to enhance axial mixing of the sludge; and/or the number of the groups of groups,

the feeding speed of the cyclone separator is 8-12m/s, and the feeding pressure is 0.1-0.25MPa.

3. The process for separating and recycling inorganic matters from sludge with high inorganic rate according to claim 1, which is characterized in that,

the sludge storage system is provided with a nutrient feeding port for microorganism culture, and culture proliferation is carried out by feeding nutrients, wherein the nutrients comprise a carbon source, a nitrogen source, a phosphorus source and microelements, the sludge storage system is connected back to a biochemical O/A tank to supplement active sludge rich in beneficial microorganisms for wastewater treatment,

the residence time of the culture and proliferation of the sludge storage system is 2-4 hours, the temperature is 25-35 ℃, and the pH value is 6-8.

4. The process for separating and recycling inorganic matters from high-inorganic-rate sludge according to claim 1, wherein the specific steps of concentrating and drying the strain preparation system to prepare the solid microbial agent are as follows:

and (3) 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 pulverizer, and screening to obtain the solid microbial agent.

5. The process for separating and recycling inorganic matters from high-inorganic-rate sludge according to claim 1, wherein the specific steps of putting a nutrient activated solid microbial agent into 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 12-72h, the temperature is 25-35 ℃, and the oxygen content is 2-3mg/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 selected from potassium dihydrogen phosphate and/or dipotassium hydrogen phosphate.

6. The process for separating and recycling inorganic matters from sludge with high inorganic rate according to claim 1, which is characterized in that,

the cyclone separator comprises a cylindrical section at the upper part and a conical section at the lower part, mixed sludge is input into the 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 arranged at the top end of the cyclone separator, and a sand discharge port is arranged at the bottom end of the cyclone separator.

7. The process for inorganic separation and recycling of sludge with high inorganic content according to claim 6, wherein,

the overflow mud discharging opening is deep to 0.7-0.8 of the height of the cylindrical section, and the diameter of the overflow mud discharging opening 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.