CN111774415A - Sewage sludge, garbage and excrement slag based co-treatment method and system - Google Patents
Sewage sludge, garbage and excrement slag based co-treatment method and system Download PDFInfo
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Microbiology (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
A sewage sludge and garbage and excrement residue based cooperative treatment method and a sewage sludge and garbage and excrement residue based cooperative treatment system solve the problem of cooperative treatment of mixed garbage and excrement residue. The method comprises the following steps: flotation, precipitate crushing, damp-heat treatment, shredding, extrusion dehydration, drying carbonization and damp-heat odor treatment. The processing system comprises: the device comprises a storage tank, a storage tank sediment grab bucket, a ball mill, a hydraulic separator, a screw conveyor, a damp and hot treatment tank floater grab bucket, a sand pump, a film liquid filter, a shredder, a screw extrusion dehydrator, a drying and carbonizing system, a fan, a denitrification tank and a washing-biological filter bed deodorization device. The storage tank sediment grab bucket corresponds with storage tank and ball mill, and damp and hot processing pond floater grab bucket corresponds with damp and hot processing pond and shredder, and ball mill, hydraulic separator, screw conveyer communicate in proper order, and silt pump, film liquid filter, shredder, screw extrusion hydroextractor and stoving carbomorphism machine communicate in proper order, and beneficial effect is that, realizes the coprocessing of mud and rubbish, excrement sediment, and the treatment cost is low, efficient.
Description
Technical Field
The invention relates to the technical field of municipal solid waste treatment, in particular to a sewage sludge, garbage and manure residue based cooperative treatment method and a treatment system.
Background
With the increase of population and the development of cities, garbage (including household garbage, kitchen garbage, fruit and vegetable garbage, greening garbage, decoration garbage, construction garbage and the like) generated in daily life and urban construction of people, sludge generated in sewage treatment, and the yield and the influence on the environment of excrement slag generated in urban septic tanks and livestock and poultry breeding become more and more serious important problems to be solved by people due to proper treatment.
The garbage is characterized by complex components, difficult sorting and difficult disposal.
The sludge is characterized by high water content, high viscosity and difficult disposal.
The manure residues are characterized by high water content, complex components, difficult separation and difficult disposal.
The town sewage treatment plant is responsible for treating town sewage and is characterized by large treatment capacity and proper treatment of generated sludge; the water temperature is low in winter, so that the biochemical treatment is not facilitated; for denitrification, a large amount of an externally purchased carbon source is added.
Because the characteristics of garbage, sludge, excrement slag and town sewage are very different, the independent treatment cost is very high, and if the synergistic treatment is carried out, the advantages can be complemented, the waste can be treated by the waste, the investment and the operation cost are greatly reduced, and the occupied area is greatly reduced.
At present, garbage, sludge, excrement slag and town sewage in China are almost treated respectively, treatment facilities are built respectively, repeated construction is caused, and the advantage of synergistic treatment is not exerted.
The main treatment mode of domestic garbage at present is incineration power generation, stack retting is required to be performed for more than 5 days before incineration to improve the heat value by dehydration, the stack retting is long in time consumption, large in occupied area and poor in effect, leachate is high in separate treatment cost, and metal and inorganic solids in the garbage seriously wear a grate of a garbage incinerator, so that the grate is high in manufacturing cost and needs to be periodically overhauled; the high moisture content of the garbage causes unstable furnace temperature, incomplete incineration and easy secondary pollution, the mixed incineration also causes low incineration efficiency, the investment and the operating cost are increased greatly, and the occupied area and the financial burden are increased.
The kitchen waste is waste formed in the process of living and consumption of residents, mainly comprises rice and flour food residues, fruit and vegetable, animal and vegetable oil, meat and bones and the like, and has the chemical compositions of starch, cellulose, protein, lipid, inorganic salt and the like. The kitchen waste treatment needs impurity removal, crushing, dehydration and other processes, and the existing separation equipment is relatively complex, high in disposal rate and poor in separation effect due to the fact that the kitchen waste contains soft and hard impurities such as bamboo wood, plastics, paper, fabrics, glass, ceramics, metal and the like. The kitchen waste is usually treated by adopting an anaerobic digestion technology, but the treatment efficiency is very low and the operation cost is higher due to the unsatisfactory pretreatment technology. The existing kitchen waste treatment plants adopt a receiving hopper to receive waste sent by a waste transport vehicle, and then utilize an inclined screw at the bottom of the receiving hopper to convey the waste to treatment equipment at a constant speed; the receiving hopper is small in size and cannot store more garbage, and the dispatching efficiency of the garbage transport vehicle is affected.
The main treatment mode of sludge produced by urban sewage treatment plants at present is drying and incineration; drying requires energy consumption, has high cost, generates a large amount of high-temperature odor and is difficult to treat; the sludge is sticky and fine, and the filter pressing dehydration is difficult. After drying, the waste water is transported to outside for incineration treatment, thereby increasing transportation cost and secondary pollution risk.
Decoration garbage and construction garbage are mostly separated by a dry method at present, a large amount of dust is generated, and components such as soil, bamboo wood, plastics, metal and the like in the decoration garbage and the construction garbage are difficult to be thoroughly separated, so that the quality of separated products is not high, and the recycling is influenced. The utilization of high-heat-value components such as bamboo and wood, plastics and the like is also problematic.
Disclosure of Invention
In order to overcome the defects of separate treatment of garbage, sludge, excrement slag and town sewage, the invention discloses a cooperative treatment method and a treatment system based on sewage sludge, garbage and excrement slag, which utilize different characteristics, interaction modification and cooperative treatment of the sewage sludge, the garbage and the excrement slag to complete treatment of different components at one time, can obviously improve the treatment efficiency and greatly reduce the occupied area, investment and operating cost.
The invention realizes the technical scheme of the invention for realizing the purpose of the cooperative processing method, which is as follows: the method is realized by the following steps:
step 1, mixing and floating sludge and garbage and/or excrement slag in water in a storage tank to generate flotage, suspended slurry and sediment which are floated on the water surface of the storage tank, wherein the flotage is accumulated to a certain thickness and then floats together with the slurry from the water surface of the storage tank through a U-shaped channel to enter an adjacent damp-heat treatment tank;
wherein, the weight percentage of the sludge is lower than 50 percent according to 80 percent of water content, and the rest is garbage and/or excrement residue;
and 3, treating the large-particle precipitate generated in the step 2 and the fine sand and slurry which can move along with the water flow:
circulating the large-particle precipitate generated in the step 2 to the step 2 for treatment;
sending the fine sand and the slurry which are generated in the step 2 and can move along with the water flow into an adjacent damp and heat treatment pool;
and 5, respectively treating the floaters subjected to the damp and heat treatment in the step 4, and fine sand and slurry which can move along with water flow:
firstly, conveying the floating objects in the damp and hot treatment tank into a shredder for shredding and then conveying the floating objects into a spiral extrusion dehydrator;
filtering a part of fine sand and slurry at the bottom of the damp and hot treatment tank by a thin film liquid filter, feeding the formed filtered sludge and floating materials in the damp and hot treatment tank into a shredder for shredding, and then feeding the shredded filtered sludge into a spiral extrusion dehydrator; filtering by using a membrane liquid filter to form filtrate, sending the filtrate to a sewage treatment denitrification tank for treatment, and refluxing a part of fine sand and slurry at the bottom of the damp and hot treatment tank to a ball mill to be used as grinding liquid and a hydraulic separator to be used as hydraulic separation liquid;
and 7, mixing the damp and hot odor generated by the damp and hot treatment tank and the odor generated around the damp and hot odor, sending the mixture into washing-biological filter bed deodorization equipment to be in full contact with the sewage treatment denitrification liquid, absorbing heat and pollutants (mainly serving as a carbon source for sewage treatment denitrification reaction) by the denitrification liquid, further purifying by using the biological filter bed to reach the standard, then discharging the purified mixture outwards, and refluxing the denitrification liquid absorbing the heat and the pollutants into the sewage treatment denitrification tank for continuous treatment.
The invention realizes the technical scheme adopted by the invention for the purpose of the cooperative processing system, and the technical scheme is as follows:
a sewage sludge and garbage and manure residue based cooperative treatment system comprises: the device comprises a storage tank, a storage tank sediment travelling grab bucket, a ball mill, a hydraulic separator, a screw conveyor, a damp and hot treatment tank floater travelling grab bucket, a sand pump, a film liquid filter, a shredder, a screw extrusion dehydrator, a drying and carbonizing system, a hot air fan, an exhaust fan, a sewage treatment denitrification tank, a damp and hot odor closed space and a washing-biofiltration bed deodorization device.
The storage tank and the damp-heat treatment tank are of adjacent open structures, an upper partition wall and a lower partition wall are arranged between the storage tank and the damp-heat treatment tank, the lower partition wall is arranged below the water surface between the storage tank and the damp-heat treatment tank to form an isolation structure below the water surface between the storage tank and the damp-heat treatment tank, one end of the upper partition wall extends into the water of the storage tank, the other end of the wet-heat treatment tank extends to the water surface of the wet-heat treatment tank, an air channel communicated with the outside is reserved, a wet-heat odor closed space is formed above the water surface of the wet-heat treatment tank by an upper partition wall, a floater underwater moving channel communicated with the storage tank and the wet-heat treatment tank is reserved between the upper partition wall and a lower partition wall, the wet-heat odor closed space is communicated with the outside through a washing-biological filter bed deodorization device and an exhaust fan pipeline, and the washing-biological filter bed deodorization device is communicated with a sewage treatment denitrification tank pipeline; the storage tank sediment travelling crane grab bucket and the damp and hot treatment tank floater travelling crane grab bucket are respectively arranged above the storage tank and the damp and hot treatment tank.
The storage tank sediment travelling crane grab bucket and the travelling crane form a structure capable of moving horizontally and vertically between the storage tank and the feed inlet of the ball mill.
The grab bucket of the floating object travelling crane and the travelling crane in the damp and heat treatment pool form a structure which can move horizontally and vertically between the damp and heat treatment pool and the feed inlet of the shredder.
The discharge port of the ball mill is communicated with a hydraulic separator, and the overflow discharge port of fine sand and slurry of the hydraulic separator, which can move along with water flow, is communicated with a wet heat treatment pool through a pipeline.
The feed inlet of the screw conveyor is communicated with the bottom of the hydraulic separator, and the discharge outlet of the screw conveyor is communicated with the feed inlet of the ball mill.
The silt pump set up in damp and hot treatment tank bottom minimum, the outlet of silt pump through filter governing valve and film liquid filter's pan feeding mouth intercommunication, silt pump export still through ball mill governing valve and ball mill feed inlet intercommunication, film liquid filter's filter mud discharge gate and shredder pan feeding mouth intercommunication, film liquid filter's filtrating discharge gate and sewage treatment denitrification pond intercommunication.
The discharge gate of shredder and the pan feeding mouth intercommunication of screw extrusion hydroextractor, the dry residue discharge gate of screw extrusion hydroextractor and the pan feeding mouth intercommunication of stoving carbomorphism system, the liquid outlet and the damp and hot processing pond intercommunication of squeezing of screw extrusion hydroextractor.
And a high-temperature tail gas outlet of the drying and carbonizing system is communicated to the position below the water surface of the damp-heat treatment pool through a hot gas fan pipeline.
The invention has the beneficial effects that: the problems of difficult separation of garbage/excrement slag, difficult modification and dehydration of sludge, low water temperature of a sewage treatment plant and the need of supplementing an externally purchased denitrification carbon source are solved, energy and substances are comprehensively utilized, different components interact to modify, and the treatment of waste by waste and cooperative treatment of garbage, sludge, excrement slag and sewage are realized. Low treatment cost and high efficiency.
The invention is described in detail below with reference to the figures and examples.
Drawings
The attached drawing is a schematic diagram of the system of the invention.
In the attached drawing, 1, a storage tank, 2, a storage tank sediment traveling grab bucket, 3, a ball mill, 3-1, a ball mill feed inlet, 3-2, a ball mill discharge outlet, 4, a hydraulic separator, 4-1, a fine sand and slurry overflow discharge outlet, 5, a screw conveyor, 6, a damp and hot treatment tank, 6-1, an upper partition wall, 6-2, a lower partition wall, 7, a damp and hot treatment tank floater traveling grab bucket, 8, a silt pump, 8-1, a filter regulating valve, 8-2 a ball mill regulating valve, 9, a thin film liquid filter, 10, a shredder, 10-1, a shredder feed inlet, 11, a screw extrusion dehydrator, 12, a drying and carbonization system, 13-1, 13-2, an exhaust fan, 14, a sewage treatment denitrification tank, 15, a damp and hot odor enclosed space, 16, a washing-biological filter bed deodorization device, a washing-biological filter bed, 17. The condensed sludge is pumped into the pipe.
Detailed Description
A cooperative treatment method based on sewage sludge, garbage and excrement slag is realized by the following steps:
step 1, mixing and floating sludge and garbage and/or excrement slag in water in a storage tank to generate flotage, suspended slurry and sediment which are floated on the water surface of the storage tank, wherein the flotage is accumulated to a certain thickness and then floats together with the slurry from the water surface of the storage tank through a U-shaped channel to enter an adjacent damp-heat treatment tank;
wherein, the weight percentage of the sludge is lower than 50 percent according to 80 percent of water content, and the rest is garbage and/or excrement residue;
the purpose of the mixed treatment of the sludge, the garbage and the excrement residue is to modify different materials so as to be beneficial to subsequent treatment, and particularly, the sewage sludge is difficult to be subjected to separate filter pressing and dehydration due to large viscosity and containing a large amount of cell binding water. In the step, the water permeability of the sludge during filter-pressing dehydration can be improved by doping impurities such as fibers in the garbage and the excrement residues, so that the filter-pressing dehydration efficiency is improved. The impurities such as fiber in the garbage and the excrement residue can also play a role of a filter aid to reduce the concentration of the squeezing liquid, so that a continuously running spiral extrusion dehydrator without filter cloth can be adopted to squeeze and dewater the mixture of the sludge, the garbage and the excrement residue, and an intermittently running plate-and-frame filter press is replaced.
Meanwhile, in the step, light objects (such as plastics, bamboo wood, grease, partial food wastes and the like) float on the water surface through flotation, heavy objects (such as masonry, glass, ceramics, metal and the like) sink at the bottom of the pool, and a part of substances are dissolved or suspended in water to form slurry.
The purpose of limiting the sludge content is to give the mixture good extrusion dewatering properties.
metals (mainly iron and aluminum) are broken down and corroded in the ball mill to chemically react with pollutants which are difficult to decompose in water, and the metals themselves become water treatment agents.
The large-particle sediment is carried out by an inclined screw conveyer at the bottom of the hydraulic separator and sent back to the ball mill for recycling treatment.
The fine sand and the slurry which can move along with the water flow overflow into a damp and hot treatment pool for treatment.
And 3, treating the large-particle precipitate generated in the step 2 and the fine sand and slurry which can move along with the water flow:
circulating the large-particle precipitate generated in the step 2 to the step 2 for treatment;
and (2) sending the fine sand and the slurry which are generated in the step (2) and can move along with the water flow into an adjacent damp and heat treatment pool.
In this step, the sediment at the bottom of the storage tank is lifted by a grab bucket connected to a traveling crane and sent into a ball mill for crushing.
And 4, heating the slurry, the floating objects, the fine sand and the slurry which enter the damp-heat treatment pool in the steps 1 and 3 and can move along with water flow to 70-100 ℃ by using high-temperature gas, and preserving heat for more than 1-2 hours.
High-temperature gas is sent below the water surface of the damp-heat treatment pool by a high-pressure hot air fan to form an 'impact water bath' state, the gas and the liquid are fully contacted, heat, moisture and pollutants in the gas are absorbed by the liquid, the surface temperature of the liquid can reach 100 ℃, and a 'damp-heat treatment' effect is generated on substances in the liquid; because the higher the water temperature, the lower the specific gravity, the higher the upper temperature of the liquid than the lower temperature, the better moist heat treatment can be obtained for the floating objects, and the energy can be saved; in the damp and hot treatment pool, the materials slowly flow from the feed inlet to the discharge outlet, and the sufficient damp and hot treatment is obtained. The wet heat treatment can break the wall of biological cells in the material, change the combined water into free water, accelerate the decomposition of pollutants and prepare for the next treatment. And 5, respectively treating the floating objects in the damp and hot treatment pool after the damp and hot treatment in the step 4, and fine sand and slurry which can move along with water flow:
firstly, conveying the floating objects in the damp and hot treatment tank into a shredder for shredding and then conveying the floating objects into a spiral extrusion dehydrator;
filtering a part of fine sand and slurry at the bottom of the damp and hot treatment tank by a thin film liquid filter, feeding the formed filtered slurry and floating materials in the damp and hot treatment tank into a shredder for shredding, and then feeding the shredded filtered slurry into a spiral extrusion dehydrator; the filtrate formed by filtering the membrane liquid filter is sent into a denitrification tank of an urban sewage treatment plant for treatment; and part of the fine sand and the slurry at the bottom of the damp-heat treatment tank are returned to the ball mill as grinding liquid and the hydraulic separator as hydraulic separation liquid.
In the step, a grab bucket connected to a travelling crane is used for sending floating materials in a damp and hot treatment pool into a shredder (a discharge hole of the shredder is provided with a sieve plate, and the diameter of the sieve hole is 30 mm) for shredding, then the floating materials enter a spiral extrusion dehydrator for squeezing and dehydrating, squeezed liquid flows back to the damp and hot treatment pool, and formed dry slag is sent into a drying and carbonizing system to be made into carbon for recycling; the bottom of a discharge port of the damp and hot treatment tank is the lowest part of the tank, the temperature can reach 70 ℃, mud and sand are accumulated in the tank, the mud and sand are pumped out by a mud and sand pump and are sent to a film liquid filter, suspended matters are filtered to form filter mud, the filter mud enters a shredder, and large materials in the filter mud are shredded; most of pollutants in the filtrate are small molecular organic compounds, are easy to carry out biochemical treatment and have higher temperature, and the pollutants are sent into a denitrification tank of an urban sewage treatment plant as carbon sources for dilution and cooperative treatment, so that the carbon sources purchased outside can be saved, the temperature of the sewage is increased, the biochemical treatment is facilitated, and the treatment cost of the filtrate is greatly reduced.
And part of fine sand and slurry at the bottom of the damp and hot treatment tank reflows to the ball mill to be used as grinding liquid and the hydraulic separator to be used as hydraulic separation liquid, and the ball mill and the hydraulic separator also play a role in aerobic aeration treatment on the liquid in the ball mill and the hydraulic separator during working.
And 6, drying and carbonizing the dry slag formed by extrusion and dehydration in the step 5.
The drying and carbonization are as follows: the materials are dried and then are subjected to anaerobic carbonization to generate pyrolysis gas; the pyrolysis gas is burnt to generate high-temperature flue gas for carbonization and drying, and the high-temperature flue gas is converted into high-temperature tail gas (high-temperature high-humidity odor).
The dry slag is dried and carbonized, so that the reduction, harmlessness and reclamation of the sludge, garbage and manure slag treatment are realized.
And 7, sending the damp and hot odor generated by the damp and hot treatment tank and the odor generated around the damp and hot treatment tank into washing-biological filter bed deodorization equipment, fully contacting and washing with denitrification liquid from the urban sewage treatment plant, absorbing heat and pollutants (mainly serving as a carbon source for sewage treatment denitrification reaction) by the denitrification liquid, further purifying by using the biological filter bed to reach the standard, then discharging the purified denitrification liquid, and returning the denitrification liquid absorbing heat and pollutants to a denitrification tank of the urban sewage treatment plant for continuous treatment.
In the embodiment of the invention, when the high-temperature gas is used for heating the material entering the damp-heat treatment pool in the step 4 of the method, the used high-temperature gas is as follows: high-temperature gas with the temperature of more than 150 ℃, wherein the high-temperature gas comprises the following components: and 6, the high-temperature tail gas generated by drying and carbonizing the dry slag in the step 6 realizes the purposes of treating waste by waste, saving energy and reducing consumption.
In the embodiment of the invention, in the step 4 of the method, the high-temperature gas and the concentrated sludge with the water content of 90 percent generated by sewage treatment are mixed in a pipeline and then are sent into the damp-heat treatment tank, so that the high-efficiency mixing and damp-heat treatment of the concentrated sludge are realized.
In the embodiment of the invention, in the step 5 of the method, the filtrate generated by the membrane liquid filter flows back to a denitrification tank of an urban sewage treatment plant for cooperative treatment.
According to the implementation ground of the method for the cooperative treatment of sewage sludge, garbage and excrement slag, the best scheme is that the method is built in a municipal sewage treatment plant, and the method has the following advantages:
1. the sludge produced by sewage treatment can be conveniently treated in time, the cost and the environmental pollution risk caused by outward transportation treatment are reduced, and the sludge is directly sent into the storage tank or the high-temperature gas pipeline through the sludge pipeline for mixing and wet heat treatment.
2. The existing denitrification treatment system sewage and odor treatment system of the urban sewage treatment plant can be utilized: the damp and hot odor (reaching 100 ℃, main pollutants are volatile fatty acid which is a carbon source) generated by the damp and hot treatment tank and the odor from the periphery are mixed in the damp and hot odor closed space and then pumped into a washing-biological filter bed deodorization device by an exhaust fan through a pipeline, the mixture is firstly fully contacted and washed with the denitrification liquid from the urban sewage treatment plant in a carbon starvation state, the heat and the pollutants are absorbed by the denitrification liquid, the liquid obtains the carbon source, the gas is cooled and purified, and then the gas enters the biological filter bed to be further purified and discharged after reaching the standard.
3. Reducing the occupied area and repeating the construction.
Referring to the attached drawing, the system is based on a cooperative treatment system of sewage sludge, garbage and excrement slag.
The system comprises: the device comprises a storage tank 1, a storage tank sediment travelling grab bucket 2, a ball mill 3, a hydraulic separator 4, a spiral conveyer 5, a damp and hot treatment tank 6, a damp and hot treatment tank floater travelling grab bucket 7, a sand pump 8, a film liquid filter 9, a shredder 10, a spiral extrusion dehydrator 11, a drying and carbonizing system 12, a hot air fan 13-1, an exhaust fan 13-2, a sewage treatment denitrification tank 14, a damp and hot odor closed space 15 and a washing-biological filter bed deodorization device 16.
The storage tank 1 and the damp-heat treatment tank 6 are of an open structure which is adjacently arranged, an upper partition wall 6-1 and a lower partition wall 6-2 are arranged between the storage tank 1 and the damp-heat treatment tank 6, the lower partition wall 6-2 is arranged below the water surface between the storage tank 1 and the damp-heat treatment tank 6 to form an isolation structure below the water surface between the storage tank 1 and the damp-heat treatment tank 6, one end of the upper partition wall 6-1 extends into the water of the storage tank, the other end extends above the water surface of the damp-heat treatment tank to leave a gas channel communicated with the outside, the upper partition wall 6-1 forms a damp-heat odor closed space 15 above the water surface of the damp-heat treatment tank 6, a floating object underwater moving channel communicated with the storage tank 1 and the damp-heat treatment tank 6 is reserved between the upper partition wall 6-1 and the lower partition wall 6-2, and the damp-heat odor closed space 15 is subjected to washing-biological filter bed deodorization equipment 16, The exhaust fan 13-2 is communicated with the outside through a pipeline, and the washing-biological filter bed deodorization equipment 16 is communicated with the sewage treatment denitrification tank 14 through a pipeline.
A cooperative treatment method based on sewage sludge, garbage and excrement slag is realized by the following steps:
when in work: the sludge and the garbage and/or the excrement slag are mixed and floated in the water in the storage tank 1 to generate flotage, suspended slurry and sediment which float on the water surface of the storage tank 1 and sediment which is deposited at the bottom of the storage tank 1. After the floating materials on the water surface of the storage tank 1 are accumulated to a certain thickness, the floating materials and the mud float together and enter the adjacent damp and heat treatment tank 6 through an underwater U-shaped moving channel reserved between the upper separation wall 6-1 and the lower separation wall 6-2. The lower partition wall 6-1 is provided to prevent the sediment at the bottom of the storage tank 1 from entering the wet heat treatment tank 6 for garbage. The upper isolation wall 6-1 is arranged for prolonging the time for the flotage to enter the adjacent damp heat treatment pool 6, so that heavy objects such as stones, metal and the like are precipitated in the storage pool 1 as much as possible, meanwhile, the upper isolation wall 6-1 forms a relatively closed damp heat odor closed space 15 at the upper part of the damp heat treatment pool 6 (only a gas channel communicated with the outside is reserved on the water surface, so that surrounding odor can be sucked), so that the damp heat odor and the surrounding odor can be collected and then enter the washing-biological filter bed deodorization equipment 16, and the damp heat odor can be prevented from diffusing to the surrounding and can be treated simultaneously.
The storage tank sediment travelling crane grab bucket 2 and the damp and heat treatment tank floater travelling crane grab bucket 7 are respectively arranged above the storage tank 1 and the damp and heat treatment tank 6.
When in work: the storage tank sediment travelling grab bucket 2 and the wet and heat treatment tank floater travelling grab bucket 7 are used for grabbing sediments in the storage tank 1 and floaters in the garbage wet and heat treatment tank 6 and sending the sediments into the ball mill 3 and the shredder 10 in the next process.
The storage tank sediment traveling grab 2 forms a structure which can move horizontally and vertically between the storage tank 1 and a feed port 3-1 of the ball mill 3.
The floating object travelling grab bucket 7 of the damp and hot treatment pool forms a structure which can move horizontally and vertically between the damp and hot treatment pool 6 and the feeding hole 10-1 of the shredder.
The discharge port 3-2 of the ball mill 3 is communicated with a hydraulic separator 4, and the overflow discharge port 4-1 of fine sand and slurry which can move along with water flow of the hydraulic separator 4 is communicated with a damp and heat treatment pool 6 through a pipeline.
The feed inlet of the spiral conveyor 5 is communicated with the bottom of the hydraulic separator 4, and the discharge outlet of the inclined spiral conveyor 5 is communicated with the feed inlet 3-1 of the ball mill.
When in work: the storage tank sediment traveling grab bucket 2 sends sediment at the bottom of the storage tank 1 to the ball mill 3, the ball mill 3 grinds and crushes sediment (such as masonry, glass, ceramics, metal and the like) at the bottom of the storage tank 1, water floatation treatment is carried out through the hydraulic separator 4 after crushing, large-particle sediment, fine sand and slurry which can move along with water flow are generated, the large-particle sediment is sent back to the ball mill 3 by the inclined screw conveyor 5 to be continuously crushed, and the fine sand and slurry which can move along with the water flow enter the damp and hot treatment tank 6 through pipelines.
Floaters (such as plastics, bamboo and wood, fabrics and the like) in the damp and hot treatment pool 6 are sent into a shredder 10 to be shredded by a travelling grab bucket 7 of the floaters in the damp and hot treatment pool.
The muddy sand pump 8 is arranged at the lowest point of the bottom of the wet heat treatment pool 6, the outlet of the muddy sand pump 8 is communicated with the feeding port of the membrane liquid filter 9 through the filter regulating valve 8-1, the outlet of the muddy sand pump 8 is communicated with the feeding port 3-1 of the ball mill through the ball mill regulating valve 8-2, the filtered mud discharging port of the membrane liquid filter 9 is communicated with the feeding port 10-1 of the shredder, and the filtrate discharging port of the membrane liquid filter 9 is communicated with the denitrification pool 14.
When in work: and (3) starting a sand pump 8, pumping part of fine sand and slurry subjected to damp-heat treatment at the bottom of the damp-heat treatment tank 6 into a membrane liquid filter 9 through a filter regulating valve 8-1 for filtering, and allowing formed filter mud to enter a shredder 10 through a discharge hole of the membrane liquid filter 9 to be treated together with floaters in the damp-heat treatment tank 6.
And (3) a sand pump 8 is started, and simultaneously, fine sand and slurry after the wet-heat treatment at the bottom of the wet-heat treatment pool 6 are pumped into the ball mill 3 through a ball mill regulating valve 8-2 to be used as grinding fluid and a hydraulic separator to be used as hydraulic separation fluid.
The water levels of the material storage tank 1 and the wet heat treatment tank 6 can be kept constant by adjusting the filter adjusting valve 8-1.
The filtrate produced by the membrane liquid filter 9 enters a sewage treatment denitrification pool 14 for treatment.
The discharge port of the shredder 10 is communicated with the feed port of the screw extrusion dehydrator 11, the dry slag discharge port of the screw extrusion dehydrator 11 is communicated with the feed port of the drying and carbonizing system 12, and the squeezing liquid outlet of the screw extrusion dehydrator 11 is communicated with the damp and heat treatment tank 6.
When in work: the mixture treated by the shredder 10 enters a screw extrusion dehydrator 11 for dehydration.
The pressed liquid generated by the screw extrusion dehydrator 11 is returned to the wet heat treatment tank 6. Dry slag generated by the screw extrusion dehydrator 11 enters a drying and carbonizing system 12 for drying and carbonizing treatment.
The high-temperature tail gas outlet of the drying and carbonizing system 12 is communicated to the position below the water surface of the damp and heat treatment pool 6 through a hot gas fan 13-1 pipeline.
When in work: high-temperature tail gas generated in the operation of the drying and carbonizing system 12 enters the position below the water surface of the damp and heat treatment pool 6 through the hot air fan 13-1 to be used as a heat source for damp and heat treatment, and comprehensive utilization of energy is achieved.
In the embodiment of the invention, in order to ensure the granularity of the materials after being shredded, the shredder 10 is a single-shaft shredder with 30 mm sieve pore diameter.
In the embodiment of the invention, in order to adapt to the treatment of the high-water-content concentrated sludge generated by sewage treatment, the high-temperature gas and the communication pipeline below the water surface of the damp-heat treatment pool 6 are communicated with the concentrated sludge pumping pipe 17 generated by sewage treatment, so that the high-temperature gas and the concentrated sludge are directly mixed in the pipeline and subjected to damp-heat treatment.
In the embodiment of the present invention, please refer to the following devices disclosed in the website.
1. Wet heat treatment of garbage and sludgehttp://www.solidwaste.com.cn/news/284994.html
2. Ball millhttps://baike.so.com/doc/5351118-5586575.html
3. Hydraulic separatorhttps://baike.so.com/doc/2742110-2894088.html
4. Screw extrusion dewatererhttp://www.sdkechuang.com/pro/11.html
5. Single-shaft shredderhttps://www.gephb.com/shredder/gss.html
6. Washing-biological filter bed deodorization equipmenthttp://www.keweihb.com/Item/Show.asp？m＝1&d＝ 2924
Claims (7)
1. A cooperative treatment method based on sewage sludge, garbage and excrement slag is characterized in that: the method is realized by the following steps:
step 1, mixing and floating sludge and garbage and/or excrement slag in water in a storage tank to generate flotage, suspended slurry and sediment which are floated on the water surface of the storage tank, wherein the flotage is accumulated to a certain thickness and then floats together with the slurry from the liquid level of the storage tank through a U-shaped channel to enter an adjacent damp-heat treatment tank;
wherein, the weight percentage of the sludge is lower than 50 percent according to 80 percent of water content, and the rest is garbage and/or excrement residue;
step 2, lifting the sediment at the bottom of the storage tank generated in the step 1, sending the sediment into a ball mill for crushing, and then sending the sediment into a hydraulic separator for water flotation treatment to generate large-particle sediment and fine sand and slurry which can move along with water flow;
and 3, treating the large-particle precipitate generated in the step 2 and the fine sand and slurry which can move along with the water flow:
circulating the large-particle precipitate generated in the step 2 to the step 2 for treatment;
sending the fine sand and the slurry which are generated in the step 2 and can move along with the water flow into an adjacent damp and heat treatment pool;
step 4, heating the slurry, the floating objects, the fine sand and the slurry which enter the damp-heat treatment pool in the step 1 and the step 3 and can move along with the water flow to 70-100 ℃ by using high-temperature gas, and preserving heat for more than 1-2 hours;
and 5, respectively treating the floating objects in the damp and hot treatment pool after the damp and hot treatment in the step 4, and fine sand and slurry which can move along with water flow:
firstly, conveying the floating objects in the damp and hot treatment tank into a shredder for shredding and then conveying the floating objects into a spiral extrusion dehydrator;
filtering a part of fine sand and slurry at the bottom of the damp and hot treatment tank by a thin film liquid filter, feeding the formed filter mud and floating materials in the damp and hot treatment tank into a shredder for crushing, feeding the crushed filter mud and the floating materials into a spiral extrusion dehydrator, feeding filtrate formed by filtering by the thin film liquid filter into a sewage treatment denitrification tank for treatment, and refluxing a part of the fine sand and the slurry at the bottom of the damp and hot treatment tank into a ball mill to be used as grinding liquid and a hydraulic separator to be used as hydraulic separation liquid;
step 6, drying and carbonizing the dry slag formed after the extrusion dehydration in the step 5, and refluxing the squeezed liquid formed after the extrusion dehydration in the step 5 to a damp and hot treatment pool for treatment;
and 7, mixing the damp and hot odor generated by the damp and hot treatment tank and the odor generated around the damp and hot odor, sending the mixture into washing-biological filter bed deodorization equipment to be in full contact with the denitrification liquid for sewage treatment, absorbing heat and pollutants by the denitrification liquid, further purifying by using a biological filter bed to reach the standard, then discharging the mixture outwards, and refluxing the denitrification liquid absorbing heat and pollutants into the denitrification tank for sewage treatment for continuous treatment.
2. The method for the cooperative treatment of sewage sludge, garbage and manure residues according to claim 1, wherein the method comprises the following steps: in the method, when the high-temperature gas is used for heating the material entering the damp-heat treatment tank in the step 4, the used high-temperature gas is as follows: high-temperature gas with the temperature higher than 120 ℃ is as follows: and 6, drying and carbonizing the dry slag to generate high-temperature tail gas.
3. The method for the cooperative treatment of sewage sludge, garbage and manure residues according to claim 1 or 2, wherein the method comprises the following steps: in the step 4 of the method, the high-temperature gas and the concentrated sludge with the water content of 90 percent generated by sewage treatment are mixed in a pipeline and then are sent to the position below the water surface of the damp-heat treatment pool.
4. The method for the cooperative treatment of sewage sludge, garbage and manure residues according to claim 1 or 2, wherein the method comprises the following steps: in step 5 of the method, the filtrate generated by the membrane liquid filter is sent to a sewage treatment denitrification tank for treatment.
5. The utility model provides a coprocessing system based on sewage sludge and rubbish, excrement sediment which characterized in that:
the system comprises: the device comprises a storage tank (1), a storage tank sediment travelling grab bucket (2), a ball mill (3), a hydraulic separator (4), a spiral conveyor (5), a damp and hot treatment tank (6), a damp and hot treatment tank floating object travelling grab bucket (7), a sand pump (8), a thin film liquid filter (9), a shredder (10), a spiral extrusion dehydrator (11), a drying and carbonizing system (12), a hot air fan (13-1), an exhaust fan (13-2), a sewage treatment denitrification tank (14), a damp and hot odor closed space (15) and a washing-biological filter bed deodorization device (16);
the storage tank (1) and the damp and heat treatment tank (6) are of an open structure which is adjacently arranged, an upper partition wall (6-1) and a lower partition wall (6-2) are arranged between the storage tank (1) and the damp and heat treatment tank (6), the lower partition wall (6-2) is arranged below the water surface between the storage tank (1) and the damp and heat treatment tank (6) to form a partition structure below the water surface between the storage tank (1) and the damp and heat treatment tank (6), one end of the upper partition wall (6-1) extends into the water of the storage tank (1), the other end of the upper partition wall extends above the water surface of the damp and heat treatment tank (6) to leave an air channel communicated with the outside, the upper partition wall (6-1) forms a damp and heat odor closed space (15) above the water surface of the damp and heat treatment tank (6), and floaters communicated with the storage tank (1) and the damp and heat treatment tank (6) are left between the upper partition wall (6-1) and the lower partition wall (6-2) to move underwater to communicate with the The wet and hot odor closed space (15) is communicated with the outside through pipelines of a washing-biological filter bed deodorization device (16) and an exhaust fan (13-2), and the washing-biological filter bed deodorization device (16) is communicated with a sewage treatment denitrification pool (14) through a pipeline;
the storage tank sediment travelling crane grab bucket (2) and the wet heat treatment tank floater travelling crane grab bucket (7) are respectively arranged above the storage tank (1) and the wet heat treatment tank (6);
the storage tank sediment traveling grab bucket (2) forms a structure capable of moving horizontally and vertically between the storage tank (1) and a ball milling feed port (3-1) of the ball mill (3);
the floating object travelling grab bucket (7) of the damp and hot treatment pool forms a structure which can move horizontally and vertically between the damp and hot treatment pool (6) and the feeding port (10-1) of the shredder;
a ball milling discharge port (3-2) of the ball mill (3) is communicated with a hydraulic separator (4), and a fine sand and slurry overflow discharge port (4-1) of the hydraulic separator (4) is communicated with a damp and hot treatment pool (6) through a pipeline;
a feeding port of the spiral conveyor (5) is communicated with the bottom of the hydraulic separator (4), and a discharging port of the spiral conveyor (5) is communicated with a feeding port (3-1) of the ball mill;
the sludge pump (8) is arranged at the lowest point of the bottom of the damp and hot treatment tank (6), the outlet of the sludge pump (8) is communicated with the feeding port of the membrane liquid filter (9) through a filter regulating valve (8-1), the outlet of the sludge pump (8) is simultaneously communicated with the ball milling feeding port (3-1) through a ball mill regulating valve (8-2), the sludge filtering discharging port of the membrane liquid filter (9) is communicated with the feeding port (10-1) of the shredder, and the filtrate discharging port of the membrane liquid filter (9) is communicated with the sewage treatment denitrification tank (14);
a discharge port of the shredder (10) is communicated with a feed port of the spiral extrusion dehydrator (11), a dry slag discharge port of the spiral extrusion dehydrator (11) is communicated with a feed port of the drying and carbonizing system (12), and a squeezed liquid outlet of the spiral extrusion dehydrator (11) is communicated with the damp and heat treatment pool (6);
the high-temperature tail gas outlet of the drying and carbonizing system (12) is communicated to the position below the water surface of the damp and heat treatment pool (6) through a hot gas fan (13-1) pipeline.
6. The sewage sludge and garbage and manure residue based cooperative treatment system according to claim 5, wherein: the shredder (10) is a single-shaft shredder with 30 mm sieve pore diameter.
7. The system of claim 5 or 6, wherein the system comprises: the pump outlet pipe (17) of the concentrated sludge produced by sewage treatment is communicated to the position below the water surface of the damp and hot treatment pool (6) through the air outlet pipeline of the hot air fan (13-1).
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| CN113385264A (en) * | 2021-06-25 | 2021-09-14 | 深圳市誉辉生态科技有限公司 | Wet-type ball-milling wet separation treatment device and method for garbage |
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