CN105693057A - Sludge anaerobic digestion additive and method for promoting methane production through additive - Google Patents
Sludge anaerobic digestion additive and method for promoting methane production through additive Download PDFInfo
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Abstract
The invention relates to a sludge anaerobic digestion additive and a method for promoting methane production through the additive. The method includes the steps of putting 0.1-1.0% of dry papermaking white mud in sludge to be stirred with water to obtain a mixture material with the pH value of 7.5-8.0 and the solid content of 5-15%, putting the mixture material in an anaerobic reactor, and conducting sludge anaerobic digestion over stirring at a constant temperature of 35-38 DEG C or 53-55 DEG C. Papermaking white mud produced in sulfate method pulping, papermaking and causticizing procedures serves as the sludge anaerobic digestion additive, and the dynamic balance of sludge hydrolytic acidification and methanation is regulated and controlled in an oriented mode; the digestion time is shortened by 15-25%, and the methane yield is increased by 40-80%. Operation is easy, running expenses are low, and the pollution of papermaking white mud and sludge to the environment is reduced; after residues produced after sludge anaerobic digestion are subjected to solid-liquid separation, biogas residues serve as a soil conditioner and are directly applied to soil, and biogas slurry is directly used as water-soluble fertilizer.
Description
Technical field
The invention belongs to reclamation of solid wastes field, relate to a kind of anaerobic sludge digestion additive and promote methanogenic method, especially relate to a kind of paper white sludge additive and promote the methanogenic method of anaerobic sludge digestion。
Background technology
Along with the quick raising of wastewater treatment in China ability, mud generation amount also synchronizes to be significantly increased。At present, whole nation the planned city, the accumulative sewage treatment plant about 3700 that builds up of county, sewage treatment capacity about 1.5～1.6 billion cubic meters/day, year produces 3500～40,000,000 tons of the mud of water content 80～90%, and with the speed increase of annual 10%。Anaerobic digestion refers under anaerobic, utilizes amphimicrobe and obligate anaerobe decomposing organic matter so as to be converted into methane and the Biochemical processes with carbon dioxide。Anaerobic Digestion sludge technology can realize sludge reduction, stabilisation, the innoxious target with resource, it is to avoid sludge treatment is improper and the secondary pollution that causes。
In numerous method for sludge treatment, anaerobic digestion has efficient energy regenerating and the advantage of relatively low environmental effect, and it is the processing method of sludge stabilizing and the resource being most widely used in the world at present。Anaerobic digestion can make volatile component in mud (VS) reduce 30%～50%, thus reaching the purpose of sludge stabilization and being conducive to following resourceization to utilize。Mud after anaerobic digestion contains abundant inorganic and organic fertilizer efficiency composition, it is adaptable to Land_use change；The auxiliary fuel in power plant or cement plant it is also used as through dehydrated anaerobically digested sludge residue。Methane is obtained, it is possible to be used for generating electricity with other technique electricity consumption needs in supplementary anaerobic digestion or Sewage Plant, it is also possible to as power fuel after anaerobic sludge digestion。Therefore anaerobic digestion techniques can significantly improve the level of recycling sludge comprehensive utilization。
Anaerobic sludge digestion process can be divided into three phases, i.e. hydrolysis stage, product acid phase and methane phase stage。Sludge hydrolytic speed is relatively slow, is the rate-limiting step of sludge digestion。Therefore, in anaerobic digestion process, if it is possible to improve sludge hydrolytic speed, then can improving more dissolubility substrate for follow-up phase, thus improving the stability of methane phase speed and course of reaction, shortening anaerobic digestion time。Researcheres propose the method for many raising sludge hydrolytic speed, the preprocess method such as including soda acid, ultrasonic, hydro-thermal and ozone。Such as Chinese invention patent (application number 201110008876.7) utilizes chlorine dioxide/ultrasonic wave-coupled technical finesse mud, and this technology, initially with chlorine dioxide treatment mud, is sent in ultrasound reactor after quickly stirring and carried out supersound process。This utilize materialization mode that mud carries out minimizing, improve Treatment of Sludge efficiency, reduce the energy consumption of 3～20%；Chinese invention patent (application number 201310129043.5) adopts a kind of steam explosion methanogenic method of pretreating sludge anaerobic digestion, can substantially increase mud biodegradability, be conducive to anaerobe to degrade, improve mud utilization rate and methane production；Chinese invention patent (application number 201210032615.3) is by multi-step dosage neutral protease and disodium EDTA, and conditioning of mud pH and temperature, sludge bacteria micelle is made to break, Organic substance in mud obtains farthest release and high-quality converts, for instance the resolvable chemical oxygen demand of mud, polysaccharide concentration and protein concentration have been respectively increased 18～20,11～13 and 1.5～2.5 times；Chinese invention patent (application number 201010266174.4) destroys mud flco first with electrochemical oxidation technology, realize the chemical hydrolysis to mud, secondly in the sludge anaerobic acidification stage, control microorganism species based on acid-producing bacteria, make the mud acidifying fermentation after hydrolysis, in the last methane phase stage, by regulating and controlling the pH value selection advantage methanogen floras of anaerobic digester system, improve methane production；Chinese invention patent (application number 201110409702.1) utilizes the vapours that pressure is 1.0 ± 0.1MP and temperature is 184 ± 2 DEG C that mud is carried out pyrohydrolysis, and the mud after hydrolysis carries out thermophilic digestion。Chinese invention patent (application number 200710002949) adds the effective microbe preparation of 0.001～5% in mud, digest 2 hours～30 days under room temperature and double oxygen condition, make sludge reduction, and remove the harmful microorganism in mud and stink, stabilizing heavy metal ion。Postdigestive mud and supernatant can partly or entirely return biochemical wastewater treatment system, make whole biochemical wastewater treatment system not produce or produce excess sludge less。The sludge anaerobic digestion system that the present invention is relatively conventional, system processing power improves 1.5～3 times, and anaerobic digestion time reduces 15～25%, and methane production improves 40～80%。Wherein, paper white sludge can efficiently destroy sludge bacteria micelle, accelerate organic dissolution, liquefaction in cell, digestion substrate abundant, suitable is provided for anaerobe, significantly improve anaerobic digestion efficiency: relative to additive method, the present invention have Organic substance dissolution rate high, simple to operate, without advantages such as special equipment and cost are low。
Paper white sludge derives from the causticization operation of sulfate pulping papermaking, and it is a kind of inorganic alkaline residue。Paper white sludge particle size range is 1～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13。The essential element of paper white sludge is composed as follows: 35～39%Ca, 2.5～3.5%Si, 0.3～0.5%Al, 1.5～2.5%Mg, 1.0～1.5%Fe, 0.1～0.3%Cu, 4.0～5.0%Na, 0.1～0.3%K, 0.4～0.6%Mn, 0.3～0.5%P, 0.2～0.4%S, 13～16%C, 20～34%O。Paper white sludge easily causes the Tri-dimension Pollution of soil, water body and air, many with landfill for main process paper white sludge at present, secondly uses as building materials, but causes that resource level is relatively low because its added value of product is low, cost is high and material mechanical performance is poor。
The surface characteristic of paper white sludge can as the place of the carrier of growth of microorganism and anaerobic reaction；The alkalescence of paper white sludge can use as alkali inorganic agent, collaborative microbial hydrolysis mud；Inorganic mineral and trace element that paper white sludge contains can meet again inorganic nutrient salt demand necessary to growth of microorganism。
At present, there is the research and utilization paper white sludge alkalinity additive strengthening changing food waste fermentation and hydrogen production as dark fermentation, as Chinese invention patent (application number 201110333252.2) significantly improves stability and the hydrogen yield of changing food waste sweat by adding paper white sludge, improve hydrogenogen activity；But the residue after this kind of refuse fermentation and hydrogen production accounts for the 70～85% of fermentation substrate, causes that raw material availability is low；Additionally, the solid slag (fermentation residue) that fermentation residue is after solid-liquid separation is made charcoal technique and be there is the defect that energy consumption is high。
Summary of the invention
The invention provides a kind of anaerobic sludge digestion additive and methanogenic method thereof。The inorganic alkaline residue (paper white sludge) that pulping and paper-making produces is applied to anaerobic digestion methane phase process。The environmental pollution of paper white sludge can be eliminated or reduce on the one hand；On the other hand, utilize paper white sludge as alkalinity additive, microorganism for sludge anaerobic digestion system provides carrier and the digestion reaction place of growth metabolism, supplements inorganic salt and trace element, collaborative microorganism raising sludge hydrolytic efficiency, improves the stability of methanogen activity, methane factor of created gase and anaerobic processes。Utilize the homeostasis process of paper white sludge orientation regulation and control sludge hydrolysis, acidification and methanation。
The present invention is realized by following measures: a kind of anaerobic sludge digestion additive, it is characterised in that described anaerobic sludge digestion additive is paper white sludge, and the particle size range of paper white sludge is 1～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13。The essential element mass percent of paper white sludge is composed as follows: the Ca of 35～39%, the Si of 2.5～3.5%, 0.3～0.5% Al, 1.5～2.5% Mg, 1.0～1.5% Fe, 0.1～0.3% Cu, 4.0～5.0% Na, 0.1～0.3% K, 0.4～0.6% Mn, 0.3～0.5% P, 0.2～0.4% S, 13～16% C, 20～34% O, the summation of above-mentioned each composition is 100%。
The present invention also provides for the new application of paper white sludge, for anaerobic sludge digestion。Preferred above-mentioned paper white sludge produces methane for anaerobic sludge digestion。Paper white sludge not only can accelerate mud alkalescence hydrolysis rate, it is provided that biochemical reaction place, supplements inorganic nutrient salt, and orientation regulates and controls the homeostasis process of sludge hydrolysis, acidification and methanation, improve mud methane production。
Described paper white sludge derives from the causticization operation of sulfate pulping papermaking, is a kind of inorganic alkaline residue, with CaCO3For main component。Paper white sludge particle size range is 1.0～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13, essential element is composed as follows: 35～39%Ca, 2.5～3.5%Si, 0.3～0.5%Al, 1.5～2.5%Mg, 1.0～1.5%Fe, 0.1～0.3%Cu, 4.0～5.0%Na, 0.1～0.3%K, 0.4～0.6%Mn, 0.3～0.5%P, 0.2～0.4%S, 13～16%C, 20～34%O, and the summation of above-mentioned each composition is 100%。
The present invention also provides for a kind of anaerobic sludge digestion additive and promotes methanogenic method, it is characterized in that:
(1) by mass percentage, the paper white sludge that 0.1～1.0% is dry is added in mud, be sufficiently mixed the pH value of material water use regulation mixed material be 7.5～8.0, solid content be 5～15%；
(2) mixed material is inserted in airtight anaerobic reactor, under 35～38 DEG C or 53～55 DEG C with stirring condition, mud is carried out anaerobic digestion methane phase。
Described paper white sludge can use after drying, it is also possible to drying does not directly use。Dry paper white sludge addition is sludge quality 0.1～1.0%；Dried paper white sludge can also be could be used without, but paper white sludge addition needs to amount to into above-mentioned corresponding butt mass percent。
Described stirring condition, those skilled in the art can select according to practical situation。
Described sludge source is between the sludge dewatering of municipal sewage plant or industrial effluent treatment plant's (station), its moisture content is 80～90%, the content of organic matter (i.e. volatile component in mud, VS) being 40～80%, this content of organic matter is the volatile component (VS) that dry mud measures through 550 DEG C of calcinations。Preferably, digestion time is 15～25d, even if 15-25 days。Reaction terminates rear, and methane content accounts for the 60～70% of biogas volume fraction, and carbon dioxide content accounts for the 30～40% of biogas fraction。
Paper white sludge additive of the present invention promotes that anaerobic sludge digestion methane phase process is: mixed with paper white sludge by mud, add in anaerobic digestion reaction vessel, add water and regulate the solid content of mixed material and pH value respectively 5～15% and 7.5～8.0, shake up, seal, carrying out anaerobic digestion methane phase at 35～38 DEG C or 53～55 DEG C, digestion time is 15～25d。Methane content accounts for the 60～70% of biogas volume fraction, and carbon dioxide content accounts for the 30～40% of biogas fraction。When collecting with the methane separated in biogas, it is possible to the separation of methane by the carbon dioxide in 5～10% sodium hydroxide solutions absorption biogas。Dry paper white sludge addition is the 0.1～1.0% of sludge quality, it is preferable that 0.5～0.8%。If paper white sludge addition is more than 1.0%, can cause that anaerobic sludge digestion methane production rate, accumulation methane production improve inconspicuous；The alkalescence that simultaneously also can cause anaerobic System is too high and reduces the problem such as methanogen activity and methane fermentative residue dehydration difficulty, therefore, does not recommend paper white sludge addition more than 1.0% in practical application。
The present invention also provides for the method for anaerobic sludge digestion comprehensive utilization, mud is after anaerobic digestion process of the present invention processes, produce gas and residue, residue is carried out solid-liquid separation, solid slag (biogas residue) utilizes directly as soil conditioner, improve soil pH value, it is suppressed that acid ground denitrification process, reduce fertilized soil nitrogen loss and N2O discharge capacity；Liquid (biogas slurry) uses directly as Water soluble fertilizer。Described gas is methane。
The invention provides a kind of paper white sludge and utilize new application。On the one hand, the alkaline matter of paper white sludge such as CaCO3And Na2S is as alkali inorganic agent, it is achieved the purpose of the collaborative microbial hydrolysis mud of alkali and raising methane production；On the other hand, other elements such as sulfur (S) of paper white sludge, potassium (K), magnesium (Mg), ferrum (Fe) etc. can provide inorganic nutrient salt, the Na in paper white sludge for the microorganism of anaerobic sludge digestion methane phase process2S can also provide anaerobism atmosphere for anaerobic sludge digestion process。Both solved mud and paper white sludge pollution problem, improve again the methane production of anaerobic sludge digestion, there is significant economic worth, environmental effect and practice significance。Compared with prior art, the present invention utilizes the inorganic alkaline residue paper white sludge of enterprises in pulp and paper industry as additive, give full play to the advantages such as the alkalescence of paper white sludge, inorganic nutrient salt, microbe carrier and anaerobic reaction place, increase organic dissolution rate and utilization rate in mud。
The method have the advantages that
1. the present invention adopts paper white sludge as the methanogenic additive of anaerobic sludge digestion, it is achieved the paper white sludge directed regulation and control to sludge hydrolysis, acidification with methanation dynamic equilibrium, improves mud methane production；Relative to the anaerobic sludge digestion matched group not adding paper white sludge, methane production improves 40～80%。Add paper white sludge and can remarkably promote sludge hydrolysis, acidification speed, increase mud methanation efficiency, it is achieved anaerobic sludge digestion process stability。
2. the present invention makes the organic matter in mud be recycled fully, after anaerobic digestion, residue is after solid-liquid separation, and biogas residue can be directly applied to soil as soil conditioner, improves soil pH value, suppress denitrification process in fertilized soil, reduce nitrogen loss and greenhouse gases N2O discharge capacity；Liquid can use directly as Water soluble fertilizer。
3. the present invention achieves the collaborative microbial hydrolysis mud of alkali by attaching paper white sludge, reclaims methane purpose；Not only improve reduction paper white sludge, mud pollution on the environment, realize again the high value added utilization of paper white sludge and mud；The alkalescence of paper white sludge can promote the Organic substance accelerated release in vitro in mud and hydrolysis acidification, provides suitable organic nutrient substance for methanogen；The mineralogical character of paper white sludge also discharges a certain amount of inorganic salt and trace element to meet the inorganic nutrients demand of anaerobe simultaneously。
4. compared with the sludge pretreatment common with heating, ultrasonic and ozone etc. and anaerobic digestion process thereof, it is low, simple to operate that the present invention has cost, is more beneficial for through engineering approaches application。In prior art " application in biological fermentative hydrogen production of a kind of paper white sludge " patent of invention (application number 201110333252.2), it is necessary to consume the energy and the time of inoculum enrichment culture, and substrate utilization ratio is only 15～30%；And The present invention reduces the inoculum enrichment culture workshop section of anaerobic digestion, it is possible to it is made directly anaerobic digestion after mud is added appropriate paper white sludge；Anaerobic digestion time shortens 15～25%, and substrate utilization ratio increases by 70～85%, and methane fermentative residue can directly as Water soluble fertilizer or soil conditioner。201110333252.2 invent the stability and the hydrogen yield that significantly improve changing food waste fermentation and hydrogen production process by adding paper white sludge, improve hydrogenogen activity；But the residue of this kind of fermentation and hydrogen production accounts for the 70～85% of fermentation substrate, cause that raw material availability is low；Additionally, utilize fermentation and hydrogen production residue to prepare charcoal soil technology there is the defect that energy consumption is high。But, paper white sludge in the present invention not only provides metabolic carrier and enzymatic reaction place and supplementary inorganic nutrient salt for the microorganism of sludge anaerobic digestion system, and the alkaline matter in paper white sludge can efficiently destroy mud colloform texture, floccule body and microbial cell, accelerate organic dissolution in cell, liquefaction, there is provided more rich for anaerobe, it is prone to the substrate that metabolism utilizes, it is obviously improved stability and the methanation efficiency of anaerobic sludge digestion process: relative to additive method, it is high that the present invention has Organic substance dissolution rate, simple to operate, without advantages such as special equipment and cost are low。Other elements that paper white sludge contains such as S, Fe, Mg, Mn and K can provide inorganic nutrient salt for methanogen, increase methanogen activity。The present invention not only solves the pollution problem of mud and paper white sludge, and has promoted anaerobic sludge digestion methane phase efficiency, has expanded paper white sludge and has utilized new way, has had significant economic benefit, environmental benefit and social benefit。Relative in national inventing patent (application number 201310175120.0), use Linesless charcoal as the additive of anaerobic sludge digestion, the present invention utilize paper white sludge as anaerobic digestion additive technology have with low cost with wide material sources etc. advantage。Relative to, in national inventing patent (application number 201110409702.1), by high temperature (184 ± 2 DEG C) steam, mud being carried out pyrohydrolysis pretreatment, the present invention has that technique is simple, energy consumption is low and is prone to the advantage of through engineering approaches。
5. mud is had biological reduced training preferably by the present invention, mud solid content and the content of organic matter reduce 20～40% and 20～50% respectively, realize sludge reduction and stabilisation, be conducive to digested sludge high value added utilization (such as soil conditioner and Water soluble fertilizer)。
6. anaerobic sludge digestion methane phase not only achieves the purpose of the minimizing of mud, stabilisation and minimizing mud organic substance contaminated environment；Produce methane as clean energy source simultaneously, significantly reduce the operating cost of sewage disposal。
7. paper white sludge is applied in anaerobic sludge digestion process, not only decreases paper white sludge, environmental pollution that mud causes, and dramatically increases sludge hydrolysis, acidification speed, improves methane production。Ca (OH) is used with a kind of thermokalite combined pretreatment method (application number 201310066365.X)2The initial pH of conditioning of mud be 8～12 patent of invention compare, paper white sludge in the present invention has the balanced action of directed regulation and control sludge hydrolysis, acidification and methanation, plays the collaborative microbial hydrolysis mud of alkali of paper white sludge, accelerates organic matter release and promote methanogen activity。Therefore, paper white sludge significantly improves stability and the methane production of anaerobic sludge digestion process。
Accompanying drawing explanation
Fig. 1 is for a kind of anaerobic sludge digestion additive and promotes methanogenic method flow diagram
Detailed description of the invention
Below in conjunction with subordinate list, the drawings and specific embodiments and comparative example, the present invention is described in detail。
Embodiment 1
(1) take the mud (in mud, the content of organic matter is 60%) that 400g moisture content is 80% and add 200ml water, then paper white sludge is added, paper white sludge addition is the 0.75% of sludge quality, paper white sludge and mud are sufficiently mixed by stirring, obtain the pH value of mixed material and solid content respectively 7.9 and 13.8%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 53 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 18d, and methane production is 90ml/gVS。
Adopting processing method as above, mud methane production is compared than the operating mode without paper white sludge, and anaerobic digestion time reduces 22%, and methane production improves 55%。
Embodiment 2
(1) take the mud (in mud, the content of organic matter is 45%) that 300g moisture content is 90% and add 200ml water, then paper white sludge is added, paper white sludge addition is the 0.5% of sludge quality, paper white sludge and mud are sufficiently mixed by stirring, obtain the pH value of mixed material and solid content respectively 7.5 and 5.4%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 55 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 15d, and methane production is 140ml/gVS。
Adopting processing method as above, mud methane production is compared than the operating mode without paper white sludge, and anaerobic digestion time reduces 25%, and methane production improves 80%。
Embodiment 3
(1) take the mud (in mud, the content of organic matter is 79.6%) that 400g moisture content is 85% and add 100ml water, then paper white sludge is added, paper white sludge addition is the 0.6% of sludge quality, paper white sludge and mud are sufficiently mixed by stirring, obtain the pH value of mixed material and solid content respectively 7.6 and 12.2%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 55 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 16d, and methane production is 172ml/gVS。
Adopting processing method as above, mud methane production is compared than the operating mode without paper white sludge, and anaerobic digestion time reduces 20%, and methane production improves 72%。
Embodiment 4
(1) take the mud (content of organic matter is 62%) that 300g moisture content is 80% and add 200ml water, then paper white sludge is added, paper white sludge addition is the 0.5% of sludge quality, paper white sludge and mud are sufficiently mixed by stirring, obtain the pH value of mixed material and solid content respectively 7.7 and 12.3%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 37 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 24d, and methane production is 94ml/gVS。
Adopting processing method as above, mud methane production is compared than the operating mode without paper white sludge, and anaerobic digestion time reduces 19%, and methane production improves 52%。
Embodiment 5
One utilizes paper white sludge to promote the methanogenic method of anaerobic sludge digestion, as it is shown in figure 1, comprise the following steps:
(1) by mass percentage, the dry paper white sludge by 0.25% is added in mud, moisture percentage in sewage sludge and the content of organic matter respectively 85% and 40%, adds suitable quantity of water and stirs to obtain the pH of mixed material and solid content respectively 7.6 and 8.5%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 38 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 22d, and methane production is 104ml/gVS。
Obtaining methane after anaerobic sludge digestion, the residue produced after anaerobic digestion is after solid-liquid separation unit operates, and the biogas residue obtained and biogas slurry can be directly applied to soil respectively as soil conditioner and Water soluble fertilizer。
Select paper white sludge as anaerobic digestion additive, make the organic matter in mud be recycled fully, also make the inorganic mineral in paper white sludge and alkaline components realize resources circulation。Decreasing the pollution to environment of mud and paper white sludge, anaerobic sludge digestion time decreased 22%, methane production improves 58%。
Embodiment 6
One utilizes paper white sludge to promote the methanogenic method of anaerobic sludge digestion, as it is shown in figure 1, comprise the following steps:
(1) by mass percentage, the dry paper white sludge by 0.4% is added in mud, moisture percentage in sewage sludge and the content of organic matter respectively 82% and 46%, adds suitable quantity of water stirring mixing, it is thus achieved that the pH of mixed material and solid content respectively 7.5 and 9.8%。
(2) putting into the anaerobic digestion facility of sealing, cultivation temperature controls at 53 DEG C, is undertaken mud is carried out anaerobic digestion by alr mode, and digestion time is 16d, and methane production is 129ml/gVS。
Obtaining methane after anaerobic sludge digestion, the residue produced after anaerobic digestion is after solid-liquid separation unit operates, and the biogas residue obtained and biogas slurry can be directly applied to soil respectively as soil conditioner and Water soluble fertilizer。
Select paper white sludge as anaerobic digestion additive, make the organic matter in mud be recycled fully, also make the inorganic mineral in paper white sludge and alkaline components realize resources circulation。Decreasing the pollution to environment of mud and paper white sludge, anaerobic sludge digestion time decreased 24%, methane production improves 72%。
Other reaction conditions of comparative example 1～6 are identical with embodiment 1～6 respectively, are different in that: comparative example does not add paper white sludge。
Table 1 enforcement group compares with the anaerobic digestion performance of contrast groups
Claims (10)
1. an anaerobic sludge digestion additive, it is characterised in that described anaerobic sludge digestion additive is paper white sludge, the particle size range of paper white sludge is 1～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13。
2. anaerobic sludge digestion additive according to claim 1, it is characterized in that, the essential element mass percent of paper white sludge is composed as follows: the Ca of 35～39%, the Si of 2.5～3.5%, 0.3～0.5% Al, 1.5～2.5% Mg, 1.0～1.5% Fe, 0.1～0.3% Cu, 4.0～5.0% Na, 0.1～0.3% K, 0.4～0.6% Mn, 0.3～0.5% P, 0.2～0.4% S, 13～16% C, 20～34% O。
3. the purposes of paper white sludge, for anaerobic sludge digestion。
4. the purposes of paper white sludge according to claim 3, it is characterised in that described paper white sludge produces methane for anaerobic sludge digestion。
5. the purposes of the paper white sludge according to claim 3 or 4, it is characterised in that described paper white sludge derives from the causticization operation of sulfate pulping papermaking, paper white sludge particle size range is 1.0～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13, the essential element mass percent of paper white sludge is composed as follows: the Ca of 35～39%, the Si of 2.5～3.5%, 0.3～0.5% Al, 1.5～2.5% Mg, 1.0～1.5% Fe, 0.1～0.3% Cu, 4.0～5.0% Na, 0.1～0.3% K, 0.4～0.6% Mn, 0.3～0.5% P, 0.2～0.4% S, 13～16% C, 20～34% O。
6. anaerobic sludge digestion additive promotes a methanogenic method, it is characterized in that:
(1) by mass percentage, the paper white sludge that 0.1～1.0% is dry is added in mud, be sufficiently mixed the pH value of material water use regulation mixed material be 7.5～8.0, solid content be 5～15%；
(2) mixed material is inserted in airtight anaerobic reactor, under 35～38 DEG C or 53～55 DEG C with stirring condition, mud is carried out anaerobic digestion methane phase。
7. a kind of anaerobic sludge digestion additive according to claim 6 promotes methanogenic method, it is characterized in that, described paper white sludge derives from the causticization operation of sulfate pulping papermaking, and paper white sludge particle size range is 1～100 μm, specific surface area is 2.3～4.7m2/ g, density are 2620～2660kg/m3, pH be 11～13；The essential element mass percent of paper white sludge is composed as follows: the Ca of 35～39%, the Si of 2.5～3.5%, 0.3～0.5% Al, 1.5～2.5% Mg, 1.0～1.5% Fe, 0.1～0.3% Cu, 4.0～5.0% Na, 0.1～0.3% K, 0.4～0.6% Mn, 0.3～0.5% P, 0.2～0.4% S, 13～16% C, 20～34% O；
Described sludge source is between the sludge dewatering of municipal sewage plant or industrial effluent treatment plant's (station), and its moisture content is 80～90%, and in mud, the content of organic matter is 40～80%。
8. a kind of anaerobic sludge digestion additive according to claim 6 promotes methanogenic method, it is characterised in that digestion time is 15～25d；Reaction terminates rear, and methane content accounts for the 60～70% of biogas volume fraction, and carbon dioxide content accounts for the 30～40% of biogas fraction。
9. a kind of anaerobic sludge digestion additive according to claim 6 and promote methanogenic method, it is characterized in that, anaerobic digestion methane phase process is: mixed with paper white sludge by mud, add in anaerobic digestion reaction vessel, the adjustment mixed material solid content that adds water is 5～15%, and pH value is 7.5～8.0, shakes up, seals, carrying out anaerobic digestion methane phase at 35～38 DEG C or 53～55 DEG C, digestion time is 15～25d；Methane content accounts for the 60～70% of biogas volume fraction, and carbon dioxide content accounts for the 30～70% of biogas fraction；Collect and when separating methane in sewage gas, absorb the carbon dioxide in biogas and separation of methane by 5-～10% sodium hydroxide solution。
10. the method for an anaerobic sludge digestion comprehensive utilization, it is characterized in that, after anaerobic digestion process described in mud any one of claim 6～9 processes, produce gas and residue, residue carrying out solid-liquid separation and obtains solid slag (biogas residue) and liquid (biogas slurry), biogas residue utilizes directly as soil conditioner, improves soil pH value, suppress acid ground denitrification process, reduce fertilized soil nitrogen loss and N2O discharge capacity；Biogas slurry uses directly as Water soluble fertilizer；Described gas is methane。
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| CN106365404A (en) * | 2016-10-20 | 2017-02-01 | 福建农林大学 | Method for promoting sludge anaerobic digestion to produce methane through red mud |
| CN113683275A (en) * | 2021-08-04 | 2021-11-23 | 中国石油大学(北京) | Method for pretreating residual activated sludge of refinery by using alkaline residue |
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| CN106365404A (en) * | 2016-10-20 | 2017-02-01 | 福建农林大学 | Method for promoting sludge anaerobic digestion to produce methane through red mud |
| CN113683275A (en) * | 2021-08-04 | 2021-11-23 | 中国石油大学(北京) | Method for pretreating residual activated sludge of refinery by using alkaline residue |
| CN113754219A (en) * | 2021-08-18 | 2021-12-07 | 中国水电建设集团十五工程局有限公司 | Process for improving yield of excess sludge anaerobic digestion methane by papermaking white mud pretreatment |
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