CN101947534A - Hydrolysis-aerobiosis two-section biological drying method for household garbage - Google Patents
Hydrolysis-aerobiosis two-section biological drying method for household garbage Download PDFInfo
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- CN101947534A CN101947534A CN2010102163842A CN201010216384A CN101947534A CN 101947534 A CN101947534 A CN 101947534A CN 2010102163842 A CN2010102163842 A CN 2010102163842A CN 201010216384 A CN201010216384 A CN 201010216384A CN 101947534 A CN101947534 A CN 101947534A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a hydrolysis-aerobiosis two-section biological drying method for household garbage and relates to a treatment technique for garbage water removal and partial biological stabilization. The method comprises the following steps of: stacking the household garbage in a groove type composting reactor and performing ventilation at long intervals; neutralizing all the generated percolate until the pH is 6.8 to 7.8; refluxing the percolate to the garbage stack in the groove type composting reactor to perform hydrolysis and drying on the garbage for four days; stopping refluxing the percolate; ventilating for two times every hour and turning for one time every two days to dry the garbage after repeating for twelve days; and removing the dried garbage from the groove type composting reactor for resource utilization or directly burning the dried garbage for energy recovery. After the biological drying process, the water content of the garbage is reduced from over 70 percent to below 45 percent; the lower heat value is increased by more than one time; the efficiency of separation is increased to 80 percent; and the recycling value of the household garbage is obviously increased. The method can be widely applied to drying treatment of the household garbage with the water content over 65 percent and solid waste which is mainly the biologically degradable waste.
Description
Technical field
The method of a kind of house refuse hydrolysis-aerobic two stages rubbish biological mummification relates to a kind of refuse moisture and removes and the part biological stabilizing treatment technique, belongs to Solid Waste Treatment and Resources and utilizes technical field.
Background technology
China's house refuse be characterized as the moisture content height, big and medium-sized cities house refuse average moisture content is 60%, part season even up to 75%, make that the sticking mutually connection of different component is serious in the rubbish, but the machinery sorting is poor, hinder the improvement of separating effect, limited the possibility that realizes the garbage disposal process optimization by sorting.Simultaneously, high-moisture percentage reduces the Lower heat value of house refuse, has cut down the burning energy recovery efficiency.Utilize level, reduce the managing household garbage cost for improving China's domestic garbage resource, press for the technical method that reduces the house refuse moisture content.
Utilize biodegradable component aerobic degradation produces in the house refuse heat and fully ventilation, it is to effectively reduce house refuse moisture content method that driving moisture is removed with the form of water vapour.At present, developed the technology of carrying out the house refuse mummification by the aerobe process merely.But, the principle of aerobe mummification is to drive water evaporates by organic matter biodegradation, therefore, when moisture and organic ratio too high (being that moisture content is too high), the heat that organic matter biodegradation produces just is not enough to drive moisture and fully evaporates, as msw water content greater than 70% o'clock, aerobe mummification product moisture content about 50% under the optimum condition, still follow-up separation there is certain adverse effect (Zhang D.Q., He P.J., Jin T.F., Shao L.M.Bio-drying of municipal solid wastewith high water content by aeration procedures regulation and inoculation.Bioresour.Technol., 2008,99:8796-8802).
Summary of the invention
The objective of the invention is to disclose the method for a kind of hydrolysis-aerobic two stages rubbish biological mummification, can make the house refuse of original moisture content more than 70% with this method, handle the back moisture content and be brought down below 45%, the house refuse Lower heat value improves more than 1 times, the efficiency of separation is increased to 80%, has significantly increased the value of house refuse by burning and sorting realization resource.
For achieving the above object, the present invention removes the target of maximization as operating process and control method with material moisture, the inventor finds: house refuse moisture content mainly is present among the surplus pericarp component in kitchen, and the ratio of the organic matter stripping during its hydrolysis and moisture content discharge, the organic matter degradation during less than its aerobic degradation and the ratio of water evaporates amount; In view of the above, it is biological dewatered that the present invention adopts that hydrolysis-aerobic two-stage process carries out house refuse, after house refuse is banked up, forms the interior facultative metabolism environment of heap body by a small amount of ventilation the (being lower than the oxygen-supplying amount that the organic matter aerobic degradation needs) earlier; Simultaneously, to pile the percolate circulating reflux of body hydrolysis of organic matter generation to piling body, utilize and be rich in cell membrane or the cell membrane that the high indigenous microorganism of hydrolysis ability destroys the surplus pericarp component in kitchen in the percolate, promote hydrolysed ferment, for avoiding the inhibition of percolate middle acid substance (volatile fatty acid etc.) to the hydrolysis metabolism, percolate is neutralized to neutrality before refluxing.After hydrolysis reaches balance substantially, carry out the processing of aerobic stage again, the heat of vaporization of utilizing organic matter degradation to produce is removed in modes such as absorption and is present in the moisture of piling among the body, further reduce the moisture content of rubbish, therefore, this stage is strengthened ventilation to satisfy organic aerobic degradation demand in the heap body; Simultaneously the heap body is carried out periodic turning, to improve the material uniformity and to keep the necessary heap body voidage of oxygen transmission.
The present invention studies by experiment, has determined the optimal operating condition of hydrolysis-aerobic two stage rubbish biological drying process, comprises the processing time of hydrolysis and aerobic stage, the ventilation in each stage and turning time, and in ventilation and the percolate and reflow method etc.
Technical scheme of the present invention is as follows:
The first step, the rubbish filling
Screen out the mixed collection house refuse earlier or based on the bulk foreign material of particle diameter in the solid waste of perishable refuse greater than 20cm, be stacked in again in the slot type compost reactor, stacking height 1.2～2.0m, press width on the rubbish surface then and lay 1 percolate backflow water distributor every 1m, cover again 20cm thick tie up the straw pad, finish the filling of junk-heap body;
Second step, rubbish hydrolysis mummification
After rubbish filling is finished 6 hours, carry out ventilating first time, the duration 5-10min that ventilates, the ventilation of accumulative total was 3 to 5 times of rubbish admission space, carried out 1 ventilation later on every 8 hours; After rubbish filling is finished 12 hours, will be by the percolate of collecting in the air duct of slot type compost reactor bottom, NaOH solution with 5% mass concentration, in the percolate regulating tank, be neutralized to pH6.8-7.8, all pump into the percolate backflow water distributor that lay on the rubbish surface again, make percolate seepage flow pass through junk-heap body, promote the rubbish hydrolysis,, in carrying out 1 percolate in 12 hours and reflux, finish rubbish hydrolysis mummification behind the rubbish filling 4d later on;
The 3rd step, the garbage aerobic mummification
After the hydrolysis mummification is finished, stop in the percolate and backflow, dwindle the blanking time of intermittent aeration, per hour ventilate 2 times, duration 5-10min ventilates at every turn, the ventilation of accumulative total is 3 to 5 times of rubbish admission space, simultaneously, carry out the turning of junk-heap body per 2 days 1 time with heap turning over device, aerobic mummification operation continues 12 days, finish the mummification rubbish that obtains after the drying and other treatment and from the slot type compost reactor, shift out, recycling or directly be transported to incineration plant and carry out energy and reclaim behind the mechanical sorting.
Percolate backflow water distributor in the described first step is the flexible plastic pipe of circular cross-section, internal diameter 6-10cm, and the surface evenly has the percolate tap hole, aperture 5mm, the hole center distance radially is 120 degree, axially is 8-10cm.
Slot type compost reactor bottom air duct in described second step is connected with air blast with the percolate regulating tank respectively with valve by three-way pipe, close the valve that connects the percolate regulating tank during ventilation, leak to avoid ventilating, open the valve that connects the percolate regulating tank when stuffy, close with air blast and be connected valve, the assurance leachate collection.
Recycling behind the mummification rubbish mechanical sorting in described the 3rd step, the vibratory sieve sorting mummification rubbish of employing elliptical aperture (hole dimension: major axis 3cm, minor axis 2cm) compass screen surface, screenings is that soil conditioner is done the soil utilization, oversize is done the derivatived fuel utilization.
The present invention has following usefulness:
1. the present invention adopts hydrolysis and biological dewatered PROCESS FOR TREATMENT high-moisture percentage refuse of aerobic two stages, broken through the obstruction that high-moisture percentage refuse biological dewatered effect is subjected to labile organic compound and the ratio restriction of moisture content, can make moisture content greater than 70% rubbish, handling the back moisture content reduces to below 45%, but Lower heat value and sorting improve simultaneously, for its recycling provides feasible condition.
2. the present invention adopts hydrolysis and aerobic biological dewatered technology of two stages, and hydrolysis stage can be removed large quantity of moisture, and ventilation is few, therefore, has reduced aerobic stage because of removing the required ventilation of moisture, has energy-conservation benefit.
3. the inventive method is used to handle high-moisture percentage refuse, msw water content is significantly descended, the Lower heat value of mummification rubbish doubles, the corresponding raising of the thermal efficiency of burning electricity generation, and its efficiency of separation also can increase to 80%, can be used for the soil conditioning by the fine grained compost that Biostatic is reclaimed in screening, and the calorific value that increases oversize further makes it to can be used for doing the auxiliary fuel utilization.
The specific embodiment
What the invention process was handled is the house refuse of mixed collection, and treating capacity is 300t/d.Rubbish initial aqueous rate 71.6%, the surplus and pericarp rubbish quality percentage 69% in kitchen, stationery 16%, plastics 10%, other 5%; Organic matter quality percentage is 88% in the dry.
The stacking density of house refuse is 550kg/m
3, in totally 16 days processing cycle, the slot type compost reactor that is used to handle, width are 4m, rubbish stacking height 1.5m, groove type reactor total length are 1440m, divide 16 and are arranged in parallel, every length 90m can handle 1 day quantity of refuse, and each bar uses in turn and satisfies processed continuously requirement.
This slot type compost reactor is provided with heap turning over device, and the bottom is laid vent channel and is used for leachate collection, and an end of vent channel is connected with air blast with the percolate regulating tank by the three-way pipe that valve is housed.Every long tank type compost reactor is joined a percolate regulating tank, and volume is 40m
3(by the water yield design of holding disposal of refuse every day quality 10%) wherein is provided with agitator and dosing mouth, is used for and percolate; Establish immersible pump at the bottom of the pond, be connected, the backflow of the back percolate that is used to neutralize with percolate return duct on the slot type compost reactor rubbish face.Every long tank type compost reactor is joined an air blast, and air quantity equates to determine with rubbish initial volume in the reactor by the air quantity of ventilation 4min, is 8100m
3/ h, blast is determined by (1000+1000 * rubbish stacking height m) Pa, is 2500Pa.
During operation, the house refuse of mixed collection is earlier through the bag-breaking machine broken bag, again through macropore (aperture 25cm) rotary screen, screen out the bulk foreign material, and after magnetic separator is selected ferrous metal, enter the slot type compost reactor, bank up by design height, after finishing, the water distributor of 4 percolate backflows of parallel laid along its length on the rubbish surface, water distributor is the flexible plastic pipe of circular cross-section, internal diameter 6-10cm, the surface evenly has the percolate tap hole, aperture 5mm, the hole center distance radially is 120 degree, axially is 8-10cm; Cover thereon again 20cm thick tie up the straw pad, and each water distributor is connected in parallel to percolate regulating tank diving delivery side of pump, so promptly finish the filling operation of rubbish.
Begin hydrolysis stage operation then, that is: after the rubbish filling is finished 6 hours, carry out ventilation first time, duration 10min ventilates, carried out 1 time later on every 8 hours and ventilate, close vent channel and percolate before the ventilation and regulate tank connected three-way pipe valve, open again after the ventilation; After rubbish filling is finished 12 hours, will be by the percolate of collecting in the vent channel of slot type compost reactor bottom, NaOH solution with 5% mass concentration, in the percolate regulating tank, be neutralized to pH6.8-7.8, all pump into the percolate backflow water distributor that lay on the rubbish surface again, make percolate seepage flow, promote the rubbish hydrolysis by junk-heap body, in carrying out 1 percolate in 12 hours and reflux, finish rubbish hydrolysis mummification behind the rubbish filling 4d later on;
And then carry out the aerobic stage operation, that is: stop in the percolate and backflow, dwindle the blanking time of intermittent aeration, per hour ventilate 2 times, the duration 10min that at every turn ventilates, simultaneously, carry out the turning of junk-heap body per 2 days 1 time with heap turning over device, remove the covering on rubbish surface during turning earlier, cover again after the turning again, aerobic mummification operation continues to finish after 12 days.
Rubbish with mummification shifts out from the slot type compost reactor then, adopts the vibratory sieve sorting mummification rubbish of elliptical aperture (hole dimension: major axis 3cm, minor axis 2cm) compass screen surface, and screenings is that soil conditioner is done the soil utilization, and oversize is done the derivatived fuel utilization.。
Measured result shows: the average treatment amount of 300t/d, and the initial aqueous rate is 71.6% house refuse, on average obtains the mummification product of 81t/d after the processing; Mummification product moisture content is 43.1%, Lower heat value 7700kJ/kg (raw refuse Lower heat value 3600kJ/kg); Screenings is 30t/d after the sorting, moisture content 45%, and butt content of organics 35%, butt nitrogen phosphorus potassium total content 8.3% can be used as soil conditioner and uses; Oversize is about 50t/d, moisture content 42%, and Lower heat value 8600kJ/kg can be used as the derivatived fuel utilization.
Claims (1)
1. house refuse hydrolysis-aerobic two sections biological dewatered methods is characterized in that:
The first step, the rubbish filling
Screen out the mixed collection house refuse earlier or based on the bulk foreign material of particle diameter in the solid waste of perishable refuse greater than 20cm, be stacked in again in the slot type compost reactor, stacking height 1.2～2.0m, lay percolate backflow water distributor on the rubbish surface then, water distributor is laid 1 by width every 1m and is carried out, cover again 20cm thick tie up the straw pad, finish the filling of junk-heap body;
Above-mentioned slot type compost reactor bottom air duct is connected with valve with threeway, and threeway is connected with air blast with the percolate regulating tank respectively;
Second step, rubbish hydrolysis mummification
After rubbish filling is finished 6 hours, carry out ventilating the first time, close the valve that connects the percolate regulating tank during ventilation, to avoid wind to leak, ventilation is 3 to 5 times of junk-heap body volume, ventilation time 5-10min, carrying out 1 time in 8 hours by same ventilation time and the every interval of ventilation later on ventilates, and after rubbish filling is finished, carried out in the percolate in 12 hours and reflux, open the valve that connects the percolate regulating tank during backflow, close with air blast and be connected valve, with the leachate collection in the air duct of slot type compost reactor bottom in the percolate regulating tank, with the NaOH solution of 5% mass concentration, the percolate pH in the percolate regulating tank is neutralized to 6.8-7.8, all pump into the percolate backflow water distributor that lay on the rubbish surface then, make percolate seepage flow in junk-heap body, promote the rubbish hydrolysis, in carrying out 1 percolate in 12 hours and reflux, 4d finished rubbish hydrolysis mummification after the rubbish filling was finished later on;
The percolate backflow water distributor that lay on above-mentioned rubbish surface is the flexible plastic pipe of circular cross-section, internal diameter 6-10cm, and the surface evenly has the percolate tap hole that the aperture is 5mm, and the hole center distance radially is 120 degree, axially is 8-10cm;
The 3rd step, the garbage aerobic mummification
After the hydrolysis mummification is finished, stop in the percolate and backflow, carry out aerobic mummification: per hour carry out 2 times and ventilate, the 5-10min that at every turn ventilates, ventilation is 3 to 5 times of junk-heap body volume, simultaneously, carried out the turning of 1 junk-heap body every 2 days, obtain mummification rubbish after finishing drying and other treatment in 12 days, mummification rubbish is shifted out from the slot type compost reactor, recycling after the sorting perhaps directly is transported to the incineration plant burning and carries out the energy recovery;
Recycling after the described sorting is to offer major axis 3cm by compass screen surface, and the vibratory sieve of minor axis 2cm elliptical aperture is with the mummification refuse classification, and screenings is utilized by the soil as soil conditioner, and oversize is done the derivatived fuel utilization.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102180720A (en) * | 2011-01-31 | 2011-09-14 | 新疆天物科技发展有限公司 | Simple air distribution pipe for treating organic wastes and using method thereof |
| CN102357510A (en) * | 2011-08-19 | 2012-02-22 | 城市建设研究院 | Method and apparatus for controlling secondary pollutants in biodrying of mixed domestic waste |
| CN102716895A (en) * | 2012-06-07 | 2012-10-10 | 泓天(大连)环境科技发展有限公司 | Method and system for drying high-temperature waste gas aerobe in urban raw refuse |
| CN104293409A (en) * | 2014-10-30 | 2015-01-21 | 成都绿源新创环保科技有限公司 | Tunnel-type biological drying resource utilization system for garbage |
| CN104690073A (en) * | 2015-03-10 | 2015-06-10 | 中国城市建设研究院有限公司 | Garage type biological drying method |
| CN109231234A (en) * | 2018-11-27 | 2019-01-18 | 陈赫然 | A method of zeolitization granular materials is prepared by coal gangue power generation lime-ash |
| CN110240501A (en) * | 2019-07-03 | 2019-09-17 | 中农新科(苏州)有机循环研究院有限公司 | The biological dewatered method of organic waste |
| CN110822435A (en) * | 2019-11-19 | 2020-02-21 | 中车环境科技有限公司 | Pretreatment method before incineration of household garbage |
| CN111299301A (en) * | 2020-03-10 | 2020-06-19 | 河南农业大学 | Method and system for treating bagged household garbage |
| CN111705842A (en) * | 2020-05-18 | 2020-09-25 | 黎忠琴 | Efficient anti-seepage method for landfill for domestic garbage treatment |
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| CN109231234A (en) * | 2018-11-27 | 2019-01-18 | 陈赫然 | A method of zeolitization granular materials is prepared by coal gangue power generation lime-ash |
| CN109231234B (en) * | 2018-11-27 | 2021-10-15 | 陈赫然 | Method for preparing zeolitized particle material from coal gangue power generation ash |
| CN110240501A (en) * | 2019-07-03 | 2019-09-17 | 中农新科(苏州)有机循环研究院有限公司 | The biological dewatered method of organic waste |
| CN110822435A (en) * | 2019-11-19 | 2020-02-21 | 中车环境科技有限公司 | Pretreatment method before incineration of household garbage |
| CN111299301A (en) * | 2020-03-10 | 2020-06-19 | 河南农业大学 | Method and system for treating bagged household garbage |
| CN111705842A (en) * | 2020-05-18 | 2020-09-25 | 黎忠琴 | Efficient anti-seepage method for landfill for domestic garbage treatment |
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Application publication date: 20110119 |