CN103496834B - A kind of fermentable that utilizes is to reduce the dewatering of moisture percentage in sewage sludge - Google Patents
A kind of fermentable that utilizes is to reduce the dewatering of moisture percentage in sewage sludge Download PDFInfo
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- CN103496834B CN103496834B CN201310454823.7A CN201310454823A CN103496834B CN 103496834 B CN103496834 B CN 103496834B CN 201310454823 A CN201310454823 A CN 201310454823A CN 103496834 B CN103496834 B CN 103496834B
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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Abstract
The invention belongs to technical field of sludge treatment, be specifically related to a kind of dehydration treatment method reducing moisture percentage in sewage sludge.The method comprises mud and dry material, stalk, composite bacteria BYM mixing granulation, heaps fermentation two processes.The fermentable that utilizes provided by the present invention to reduce the principle of the dewatering of moisture percentage in sewage sludge is: can produce a large amount of heats in fermentation process, utilizes the water ratio that these heats can realize in the reduction mud of low cost.Compared to prior art, the present invention has less energy-consumption, low material consumption, advantage that cost is low, and the moisture percentage in sewage sludge after having fermented is down to less than 30%, has larger potentiality to be exploited, as compoiste fertilizer or material of construction, the recycling of product can be conducive to.
Description
Technical field
The invention belongs to technical field of sludge treatment, be specifically related to a kind of dehydration treatment method reducing moisture percentage in sewage sludge.
Background technology
At present, along with the continuous propelling of urbanization process and the concern of people to environment protection constantly increase, the mud produced in city domestic sewage treating processes and disposing has become an increasingly serious problem.In recent years, although China has carried out extensive work in the process disposal of mud, but due to economic technology reason, China's sludge treatment ability is also very weak, is mainly manifested in: the sludge treatment rate meeting environmental protection requirement is low; Sludge treatment design level is low, technique imperfection, and facility falls behind, less investment; Policy is unsound, it is not in place to supervise; Relevant criterion lacks systemic, scientific.
The management that sewage disposal is relevant and technical defect make a large amount of municipal sludge to stack temporarily, many big cities are caused to occur the phenomenon that mud is encircled a city and started to spread to small and medium-sized cities, the mud of a large amount of accumulation, not only take tract, and objectionable constituent wherein such as heavy metal, pathogenic bacteria, parasite, organic pollutant and foul smell etc. become large public hazards of urban environmental hygiene, and bring great potential safety hazard to ecotope.
Present stage, specific resistance to filtration method mainly contains landfill, compost, burning etc.But these methods all require the water ratio of mud to be reduced to 40% ~ 60% even lower, and the moisture percentage in sewage sludge of general municipal wastewater treatment plant after sludge concentration and dewatering is all about 80%, this just requires the water ratio that further must be reduced mud before sludge disposal by certain means, the material consumption that this process need is a large amount of and investment, and general strengthen dewatering technology can cause certain infringement to the organic composition in mud, is unfavorable for the recycling of mud.
Summary of the invention
The object of the invention is to provide a kind of fermentable that utilizes to reduce the dewatering of moisture percentage in sewage sludge, thus solves traditional sludge strengthen dewatering technology high energy consumption, problem with high investment.
The technical solution adopted in the present invention is as follows:
Utilize fermentable to reduce a dewatering for moisture percentage in sewage sludge, comprise the following steps:
(1) by the stalk mixing granulation after mud, dry material, pulverizing;
Described mud is the bulk mud of town domestic sewage treatment plant water ratio 60% ~ 80%;
Described dry material is back-mixing material, flyash or element soil;
Stalk after described pulverizing is mixture that is a kind of in wheat stalk, maize straw, peanut straw or any several arbitrary proportion, and after pulverizing, particle diameter is 3 ~ 50mm, also can use sawdust, wood chip, weeds etc.;
(2) in mixture, add composite bacteria BYM during granulation, make bacterial classification Homogeneous phase mixing in granule sludge;
Described composite bacteria BYM utilizes the former bacterium from Japanese Pan Ya Co., Ltd.-society of the enzymatic microorganism world, and former bacterium is cultivated into expansion bacterium by 1:100 and uses;
(3) granule sludge is carried out aerobic fermentation after completing by granulation.
In step (1), each material by percentage to the quality: mud 40% ~ 60%, dry material 30% ~ 40%, stalk 5% ~ 15%.
Granulation described in step (1) adopts granulating disc granulation, and first add a small amount of dry material in granulation process, then add the stalk after mud, dry material and pulverizing successively, the granularity after granulation is Φ 3 ~ 50mm.
Composite bacteria BYM described in step (2), during to introduce, former bacterium uses after expanding cultivation in 1 ﹕ 100 ratio, and consumption is 0.1% ~ 0.5% of mixture quality in step (1).
Carry out forced ventilation oxygen supply by gas blower in fermenting process in step (3), gas blower has the effect taking away the moisture produced in sludge fermentation process simultaneously, can accelerate sludge dehydration progress.
Fermenting process in step (3), adopt temperature and oxygen content sensor to regulate blower motor frequency by frequency transformer, the PLC realizing ventilation controls automatically.
In step (3), the inner leavening temperature of heap body remains on 50 ~ 65 degrees Celsius of 5 ~ 15d.
The fermentable that utilizes provided by the present invention is can produce a large amount of heats in fermentation process to reduce the principle of the dewatering of moisture percentage in sewage sludge, utilizes the water ratio that these heats can realize in the reduction mud of low cost.The product fermented after having dewatered serves many purposes, can use as compoiste fertilizer, can use as material of construction, also as fuel or light ceramic ball can be fired into, the less energy-consumption process disposal of whole process implementation mud and comprehensive utilization of resources, dispose for sludge from wastewater treatment plant process and provide a kind of new solution route.
Specifically, the present invention, compared to prior art, has the following advantages:
(1) reduce by the method for aerobic fermentation the biologic treating technique that moisture percentage in sewage sludge belongs to mud, for the physics of sludge dewatering, chemical treatment method, there is the feature of less energy-consumption, low material consumption;
(2) by carrying out aerobic fermentation after granulation to mud, during the fermentation by the oxygen supply of gas blower forced ventilation, eliminate and turn over throwing process in traditional sludge aerobic fermentation, save machinery investment and running cost, and forced ventilation also helps the removal of moisture in mud;
(3) in mud granulizing process, add composite bacteria BYM, this belongs to a kind of aerobic fermentation composite bacteria, in material fermentation process, can be good at Long carbon chain organic substance decomposing to become micromolecular organism, and reaction process is aerobic processes, can not produce ammonia, fermenting process is destitute of smell; BYM Pseudomonas is in microbial composite bacteria kind, and the mud after interpolation carries out aerobic fermentation, and the product after having fermented has the effect of part microbial fertilizer, is conducive to the recycling of product;
(4) in fermenting process, by taking automatization digital control technology to oxygen concentration in heap temperature and heap body, in guarantee heap body air while oxygen level, heap body internal temperature can control preferably at 50 ~ 65 DEG C, in whole fermenting process, heap body internal temperature can maintain more than 50 DEG C 5 ~ 10d even longer time, realizes fully fermenting, thus meets the requirement of " decontamination of human excreta hygienic standard " (GB7959-87).
Accompanying drawing explanation
Fig. 1 is aerobic fermentation process schema after mud granulizing.
Embodiment
Below in conjunction with embodiment the present invention will be further explained explanation.
embodiment 1
As shown in Figure 1, the fermentable that utilizes provided by the present invention mainly comprises granulation and fermentation two steps to the dewatering reducing moisture percentage in sewage sludge, is specifically described below:
(1) mixing of materials granulation and bacterial classification add
To prepare the fermentation granule sludge of 100kg; after opening granulating disc; first the bulk mud (water ratio 75% ~ 80%) of 55kg town domestic sewage treatment plant is added in granulating disc; after mud adds; with mud: dry material: stalk mass ratio is that the ratio of 0.55:0.35:0.10 adds dry material and the stalk after pulverizing, namely dry material dosage is 35kg, stalk dosage is 10kg.After dry material uses airing, water ratio is the mud of 30%, and stalk uses wheat stalk after crushed, and the stalk particle diameter after pulverizing is within the scope of 10 ~ 20mm.
In granulation process; mixture is pulverized and mixes by granulating disc built-in hammering crushing device further, and in the operation process of granulating disc, mixture material under gravity and velocity contrast effect constantly rises and declines; rolling balling, finally reaches the object of mixing granulation.
In granulation process, in order to prevent mud from boning on disk, granulating disc is installed multiple scraper.
In granulation process, when material adds, first add a small amount of dry material, adhere on granulating disc during to prevent from adding wet mud, then add wet mud and dry material, stalk successively.Wet mud due to what first add; after the dry material that adds and stalk; and add when dry material and stalk constantly rotate at granulating disc, material constantly mixes; so final granule sludge of making can be formed with wet mud for grain core, the granule sludge of the wet inside and dry outside of outside parcel dry material and stalk.
In mixture granulation process, add composite bacteria BYM, the dosage of bacterial classification, in 0.5% of mixture total mass, is 0.5kg.
Composite bacteria BYM draws from Japanese Pan Ya Co., Ltd.-society of the Japanese ferment world, is a kind of composite bacteria comprising bacterium, yeast and thread fungus three quasi-microorganism, after introducing by its former bacterium 1 ﹕ 100 expand cultivate after use.
After the mixing granulation of 20min number minute, the granularity in granulating disc is at about 10 ~ 30mm, and granulation completes.
(2) aerobic fermentation
After granulation completes, open the drawing mechanism of granulating disc, start transfer roller, granule sludge granulation in granulating disc completed simultaneously, be delivered in special fermentation cabin.
The fermentation cabin that the present embodiment adopts is cylindrical, diameter 1.0m, and height 3m, virtual height heaped by material is 2m.Grid screen cloth is housed bottom fermentation cabin, granule sludge is accumulated on grid screen cloth, and bottom to be ventilated oxygen supply by gas blower, and air permeable grid screen cloth enters into sludge body, to meet the needs in fermentation process, and the object removing moisture in heap body can be realized simultaneously.Fermentation cabin top is provided with gas skirt, detects with the tail gas collected in fermenting process.The useful volume of fermentation cabin is 1.57m
3, the mud unit weight after granulation completes is 0.8 ~ 0.9 t/m
3, once can load material 1.25 ~ 1.41 t.
The granulating disc that the present embodiment adopts can process mixture 100 ~ 200kg at every turn, and after 7 batches of granulations, in fermentation cabin, filling granule sludge is about 1.3t.
Load can carry out aerobic fermentation in fermentation cabin.In fermenting process, gas blower ventilation can be adjusted by temperature sensor, oxygen concentration detecting instrument device in good time, the inner leavening temperature of body when oxygen concentration is too low or can be piled higher than stronger ventilation amount when 65 DEG C, otherwise then reduce ventilation, in a word, the coordination of heap temperature and heap body oxygen concentration to be considered when regulating ventilation, when piling the inner leavening temperature of body and remaining on 50 ~ 60 DEG C, need ensure that in heap body, content of oxygen in air is in 10%(volume ratio) more than.
The water ratio of periodic monitoring material and temperature variations in fermenting process.
Fermentation cabin, in granule sludge fermenting process, after about 25 hours, namely heap body internal temperature rises to more than 50 DEG C, and continuous 7 days heap body internal temperatures remain on 50 ~ 65 DEG C, at the 9th day, temperature starts to decline gradually, until the 12nd day drops to about 25 DEG C (near room temperatures), pile body content of oxygen in air in the process and remain at 10%(volume ratio) more than, now temperature remains near room temperature and also no longer rises, and the water ratio recording material is down to 28%, shows that fermenting process completes.
(3) product utilization
Sludge product finally after fermentable dehydration, achieves the object that water ratio is down to less than 30%, and the material after first fermentation except directly as except other purposes, also can be used as sludge dewatering dry material and back-mixing material uses.
embodiment 2
What the present embodiment adopted utilizes fermentable identical with embodiment 1 to the dewatering reducing moisture percentage in sewage sludge, and granulation process is identical, and difference is material ratio and heap body aerobic fermentation mode, concrete difference and experimentation as follows:
The blending ratio of each material that the present embodiment adopts is as follows:
In mass ratio, mud: dry material: the dosage of stalk matter=0.50:0.40:0.10, composite bacteria BYM is 0.25%.The granule sludge that the multiple batches of fermentation that dry material uses embodiment 1 finally to prepare completes.
The present embodiment adopts static heap fermentation mode, and the granule sludge after granulation is about about 30t, carries out static state and heaps, and heap body is conical, is highly 3m, is equipped with ventilator trunk bottom heap body, piles body and is built-in with temperature measuring equipment and oxygen content determinator.
In fermenting process, gas blower ventilation can be adjusted by temperature sensor, oxygen concentration detecting instrument device in good time, when oxygen concentration is too low or the inner leavening temperature of heap body higher than stronger ventilation amount when 65 DEG C, otherwise, then reducing ventilation, in a word, the coordination of heap temperature and heap body oxygen concentration will be considered when regulating ventilation, when piling the inner leavening temperature of body and remaining on 50 ~ 60 DEG C, need ensure that in heap body, content of oxygen in air is in 10%(volume ratio) more than.
After the abundant fermentation of 15 days, the water ratio monitoring material is down to less than 30%, and heap body internal temperature remains on about 30 DEG C, and surface temperature, close to room temperature 25 DEG C, shows that fermenting process completes.
It should be noted that, the specific embodiment of the present invention is not limited to above 2 kinds.In granulation process, dry material used because of the finished product purposes different, the dry material added difference to some extent, such as, when the finished product are as material of construction (as cement raw material and fuel), can add flyash or element soil and improve its usage ratio; If used as compoiste fertilizer, then should use the granule sludge after fermentation dehydration and back-mixing material.When implementing of the present invention, during granulation process initial start-up, after also can using airing as described in example 1, the mud of water ratio below 30% substitutes.
Stalk after the pulverizing used in granulation process, the water ratio in order to regulate mixture on the one hand, also there is the effect of serving as skeleton in granule sludge after the pelletizing on the one hand, stalk described in the present invention generally adopts farmland stalk, as wheat straw, peanut straw, maize straw, weeds, wood chip, sawdust etc. can also be used.
After mixture granulation completes, static heap as described in Example 2 can be selected to ferment or use fermentation cabin special as described in Example 1 to ferment, and under the prerequisite guaranteeing Uniform Ventilation, fermentation cabin diameter in theory can be infinitely great, and its height can reach 3 ~ 8m.
When adopting static heap fermentation, can lay ventilator trunk, adopt the oxygen supply of gas blower forced ventilation in fermenting process bottom windrow, ventilation process is also conducive to piling the moisture produced in body and removes fast.When material heaps height lower than 2m, also can save forced ventilation process, reach oxygen supply by natural ventilation and remove the object of moisture.
When selecting fermentation cabin to ferment, granule sludge can being transported in special aerobic fermentation chamber and carrying out aerobic fermentation, by controlling the discharging of fermentation cabin bottom and top input speed, realizing being back to back of material.
Water ratio and the temperature variations of periodic monitoring material is answered in fermenting process.When temperature no longer raises, when water ratio drops to below 30%, represent that fermenting process completes, this process generally needs 7 ~ 15d.
Sludge product after final fermentation dehydration, water ratio is down to less than 30%, can direct landfill stabilization, also can further comprehensive development and utilization.Owing to adding composite bacteria BYM in fermenting process, finished product has effect of part microbial fertilizer, and the recycling tool therefore for product is of great significance.When heavy metal, organic content meet relevant national standard in product, organic composite fertilizer can be made; Heavy metal content is higher, and organic content is lower, can directly as material of construction (as cement raw material etc.) or be fired into light ceramic; Finished product contains organic matter, has certain fuel value, can also make fuel and use.
Claims (3)
1. utilize fermentable to reduce a dewatering for moisture percentage in sewage sludge, comprise the following steps:
(1) by the stalk mixing granulation after mud, dry material, pulverizing;
Described mud is the bulk mud of town domestic sewage treatment plant water ratio 60% ~ 80%;
Described dry material is back-mixing material, flyash or element soil;
Stalk after described pulverizing is mixture that is a kind of in wheat stalk, maize straw or peanut straw or any several arbitrary proportion, and after pulverizing, particle diameter is 3 ~ 50mm;
Each material by percentage to the quality, mud 40% ~ 60%, dry material 30% ~ 40%, stalk 5% ~ 15%;
(2) in granulation process, in mixture, add composite bacteria BYM, make bacterial classification Homogeneous phase mixing in granule sludge;
Described composite bacteria BYM is from Japanese Pan Ya Co., Ltd.-society of the enzymatic microorganism world, and former bacterium is cultivated into expansion bacterium by 1:100 and uses, and consumption is 0.1% ~ 0.5% of mixture quality in step (1);
(3) granule sludge is carried out aerobic fermentation after completing by granulation;
In step (3), the inner leavening temperature of heap body remains on 50 ~ 65 degrees Celsius of 5 ~ 15d.
2. utilize fermentable to reduce the dewatering of moisture percentage in sewage sludge as claimed in claim 1; it is characterized in that; granulation described in step (1) adopts granulating disc granulation; first granulation initiating process adds a small amount of dry material; add the stalk after mud, dry material and pulverizing again, the granularity after granulation is Φ 3 ~ 50mm.
3. utilize fermentable to reduce the dewatering of moisture percentage in sewage sludge as claimed in claim 1, it is characterized in that, in step (3), in fermenting process, utilize gas blower to carry out forced ventilation oxygen supply.
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| CN104529112B (en) * | 2014-11-28 | 2019-09-03 | 中央民族大学 | Sludge organism drying method for treating |
| CN105502805B (en) * | 2015-12-03 | 2018-03-09 | 赵亚勋 | Enhancement microbiological multistep treatment sanitary sewage and the processing system and domestic sewage processing method of recycling |
| CN106007178A (en) * | 2016-06-17 | 2016-10-12 | 阿斯旺（北京）环保科技有限公司 | Distributed and structured town sewage pelletization treatment process and pelletization reactor |
| CN108191399A (en) * | 2018-02-25 | 2018-06-22 | 上海鑫晶山建材开发有限公司 | A kind of biomass modified sludge baked brick and preparation method thereof |
| CN109250883B (en) * | 2018-11-27 | 2021-09-14 | 内蒙古济世源环保生物科技有限公司 | Sludge treatment method |
| CN110791345B (en) * | 2019-11-27 | 2021-09-17 | 湖南蓝优环保科技有限公司 | Preparation facilities of biomass briquette of pig manure suppression |
| CN111233304B (en) * | 2020-02-06 | 2022-05-31 | 深圳市政水环境技术有限公司 | Wall breaking agent for sludge, hydrophobic skeleton, preparation method and sludge reduction method |
| CN111303957A (en) * | 2020-03-11 | 2020-06-19 | 杨力发 | Biomass fuel based on fly ash and sludge, and preparation method and application thereof |
| CN111978016B (en) * | 2020-07-27 | 2022-02-22 | 上海复洁环保科技股份有限公司 | Sludge composite particles, vegetation concrete and preparation method and application thereof |
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| JP2012115741A (en) * | 2010-11-30 | 2012-06-21 | Ishigaki Co Ltd | Treatment apparatus and treatment method for sewage sludge |
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| CN1727292A (en) * | 2004-07-29 | 2006-02-01 | 机科发展科技股份有限公司 | Method for integrating technique of damp drying sludge with technique for fermenting acrobic compost in high temperature |
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