31results about How to "Shorten the time of anaerobic fermentation" patented technology

The invention discloses a method for improving sludge anaerobic fermentation and acid production, belonging to the environmental protection technical field. The method is taken as follows: the residual sludge of municipal sewage plants are used as the raw material, wall breaking action is applied to the microorganisms in the sludge by control of the operating parameters of ultrasonic in order to ensure most of the organic substances in the cells of the microorganisms to be dissolved, lye is added to the sludge to regulate the pH value of the sludge, and the sludge is transformed furthest from the solid phase to the liquid phase and made to produce volatile organic matter under the action of the lye and the microorganisms. The invention further improves the quantity of the organic acid produced from the sludge on the basis of sludge innoxiousness and resource utilization.

The invention belongs to the technical field of environmental protection and relates to a method for improving the methanogenesis of residual sludge by heat and alkali combined pretreatment. According to the method, after the residual sludge is thermally pretreated, the dissolving in water of organic matters such as protein and polysaccharide in the residual sludge can be improved significantly so that abundant water-soluble organic matrixes can be provided for the fermentation of the sludge and the generation of acids; and in addition, after the residual sludge is pretreated under the initial alkaline condition, the dissolving and the dehydrating of the sludge can be promoted further and short chain fatty acids can be produced continuously. Therefore, the residual sludge dehydrating efficiency and the acid generating efficiency can be improved greatly by the combination of thermal pretreatment and the initial alkaline condition so that the yield of methane can be increased to the maximum extent.

The invention discloses a short-chain volatile fatty acid and a preparation method thereof. The preparation method for the short-chain volatile fatty acid comprises the following steps of employing sludge as a fermentation substrate; adding sodium nitrite into the fermentation substrate, performing pretreatment in an acid environment, and performing anaerobic fermentation under an alkaline condition to obtain the short-chain volatile fatty acid. According to the short-chain volatile fatty acid and the preparation method thereof, the sludge of a sewage treatment plant is taken as a raw material, and is jointly treated by virtue of free nitrite pretreatment and alkaline anaerobic fermentation, and the concentration of free nitrite in the system, the pretreatment time, the fermentation pH value and the action of microorganisms in the sludge are controlled to maximally convert undissolved sludge organic matters in the sludge into the short-chain volatile fatty acid, so that the yield of the volatile fatty acid produced from the sludge is further increased on the basis of resourcefully utilizing the sludge and reducing environmental pollution caused by the sludge, and the reaction time is shortened; the short-chain volatile fatty acid and the preparation method thereof have the advantages of high product yield, simple preparation method, energy conservation, consumption reduction, low running cost and the like.

The invention belongs to envrionmental protection technique field, in detail relates to a method for increasing organic aicd output through adding anion surface active agent and controlling basic pH value. It takes primary sludge, excess sludge or mixture of them in wastewater treatment plant, converses organic matter in insoluble sludge to organic acid maximumly by adding anion surface active agent, controlling basic pH and employing bacteria function in said sludge. The ratio between consumption amount of anion surface active agent and sludge dry amount is 0.01: 1- 0.1- 1, the pH is controlled between 8 to 12 for bacteria action, the retention time of sludge in reactor is from 5 hours to 30 days. The invention increases organic acid output when makes full use of sludge and reduces environmental pollution.

The invention discloses a method used for increasing sludge anaerobic fermentation production of volatile short-chain fatty acids, and belongs to the technical field of sludge resource recycling, andmore specifically relates to a calcium peroxide (CaO2) combined free ammonia (FA) method used for increasing sludge anaerobic fermentation production of volatile short-chain fatty acids. The method comprises following steps: sludge obtained through removing supernatant of municipal sewage plant residual sludge after natural static precipitation is taken as a fermentation base material, the fermentation base material is uniformly mixed with calcium peroxide (CaO2) and ammonium chloride (NH4Cl), at a certain temperature, pH is adjusted to convert ammonia nitrogen into free ammonia (FA), pre-treatment reaction is carried out for 72h, and at stirring conditions, anaerobic fermentation is carried out continuously, wherein under the calcium peroxide (CaO2) combined free ammonia (FA) pre-treatment effect, hydrolysis rate is increased obviously, acidifying phase is promoted, methanogen activity is inhibited at the same time, and large amount accumulation of volatile short-chain fatty acids canbe realized. The method is capable of increasing the amount of volatile short-chain fatty acids obviously; the produced volatile short-chain fatty acids can be applied in sewage processing; sewage nitrogen and phosphorus removal effect is improved; sludge quantitative reduction, harmlessness treatment, and resource recycling are realized.

The invention provides a method utilizing sludge anaerobic fermentation to produce fatty acid. The method comprises the following steps: taking sludge obtained from sewage treatment as a raw material; removing the supernatant after natural settlement to obtain a sludge sample, mixing the sludge sample and alkyl glycoside serving as a surfactant, and fermenting the mixture in the anaerobic environment to produce the fatty acid. The method can prevent the sludge sample from producing methane and improve the organic acid production capability of the sludge sample; the obtained organic acid can be continually applied in the sewage treatment process to improve the effect in removing nitrogen and phosphorus from sewage, so that reduction, harmlessness and recycling of sludge treatment can be realized.

The invention discloses a low-temperature-resistant composting fermentation microbial inoculum with a deodorizing function and applications of the low-temperature-resistant composting fermentation microbial inoculum. The microbial flora contained in the low-temperature-resistant composting fermentation microbial inoculum provided by the invention can tolerate low temperature, and can normally grow at 15-20 DEG C, so that the fermentation air temperature of organic materials in the low-temperature environment is facilitated, in addition, the strains have the mutual promotion effects, therefore, a mutual synergistic effect is generated, and further, decomposing is accelerated. The experiment proves that during the composting process, after the low-temperature-resistant composting fermentation microbial inoculum is added into the organic materials for fermentation, the sum of effective microbes at the composting initial stage is improved, the temperature increase rate of the composted materials is accelerated, the anaerobic fermentation time is shortened, the decomposing process is accelerated, meanwhile, the discharge of sulfur-containing compounds and nitrogen-containing compounds is reduced, the physicochemical properties of the fermentation products are optimized, and in addition, the low-temperature-resistant composting fermentation microbial inoculum has a certain deodorizing function.

The invention relates to a method for promoting residual sludge anaerobic fermentation to produce fatty acid through potassium peroxymonosulfate sulfate compound salt (PMS). The method specifically comprises the following steps: (1) treating residual active sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant as a fermentation raw material, and naturally settling to remove liquid supernatant to concentrate and treat to obtain a sludge sample; (2) mixing and pre-treating the sludge sample with potassium peroxymonosulfate sulfate compound salt (PMS), and fermenting under an anaerobic environment to generate fatty acid. After residual sludge is subjected to PMS pretreatment, dissolving of organic substances in sludge is quickened, and activity of acid-consuming microorganisms such as methanogenic bacteria is further inhibited sufficiently, and therefore, the acid yield is greatly increased, and sludge anaerobic fermentation time is shortened; and moreover, the method provided by the invention is simple in operation, and has important environment-friendly ecological significance for reducing, recycling and stabilizing sludge.

The invention relates to a method for promoting hydrogen production by anaerobic fermentation of remaining sludge through potassium peroxymonosulfate (PMS). The methods comprises the following specific steps: (1) with remaining activated sludge produced by a secondary sedimentation tank of a municipal sewage treatment plant as a fermentation raw material, removing supernatant by natural sedimentation and carrying out concentration treatment to obtain a sludge sample; and (2) mixing and preprocessing the sludge sample and PMS, then inoculating a certain volume of hydrogen-producing seed sludge,and fermenting in anaerobic environment to produce hydrogen. After the remaining sludge is pretreated by PMS, the dissolution of organic matter in the sludge is accelerated. The organic matter dissolved after the sludge is cracked provides a rich matrix for hydrogen production by fermentation, thereby improving the hydrogen production, shortening the time of sludge anaerobic fermentation and reutilizing the remaining sludge. The method provided by the invention is simple to operate, has mild reaction conditions, and has good application prospects in environmental control and comprehensive utilization of waste resources.

The invention discloses a method for improving the resource utilization of kitchen waste. The method comprises the following steps: (1) grinding and pulping kitchen waste to obtain an anaerobic fermentation substrate; (2) adding civil sludge into the substrate to serve as an inoculating microbe; (3) diluting the fermentation substrate with washing wastewater containing linear alkyl benzene sulfonates to obtain a fermentation system; and (4) performing oxygen removal and sealing on the fermentation system, and performing anaerobic fermentation. The method can improve the characteristics of kitchen waste by adding washing wastewater to realize resource utilization and recycling of the kitchen waste and the like and is favorable to reduction and harmless disposal of washing wastewater and kitchen waste; furthermore, relative to clean water, such as tap water, kitchen waste is diluted with washing wastewater, the solid content of the kitchen waste is reduced, and the treatment cost can bereduced; and the linear alkyl benzene sulfonates can be used for promoting dissolution of complex organic substances and increasing the generation rate and yield of short-chain fatty acids, the anaerobic fermentation time can be remarkably shortened, and the operation cost can be reduced.

The invention relates to a method for producing a short-chain fatty acid employing combined pretreatment of activated sludge. The method comprises the following steps: (1) carrying out gamma-ray irradiation on activated sludge, so as to prepare gamma-ray irradiated sludge; (2) carrying out ultrasonic treatment on the gamma-ray irradiated sludge, so as to prepare ultrasonic-treated sludge; and (3) adjusting the pH value of ultrasonic-treated sludge, carrying out anaerobic fermentation, so as to prepare the combined pretreated activated sludge. After the activated sludge is subjected to gamma-ray irradiation and ultrasonic treatment, organic matters such as protein and polysaccharide in the sludge dissolved into water can be significantly improved, so that an abundant organic matrix which can be dissolved into water is provided for fermentation and acidogenesis of sludge; the acid production rate of the sludge is improved; the anaerobic fermentation time of the sludge is shortened; and the method has important significance in improvement and optimization of an existing sludge treatment system, energy conservation and consumption reduction, and reduction of the operation cost.

The invention relates to a method for promoting degradation of pollutants in excess sludge and producing fatty acid. The method comprises the following specific steps: firstly, taking excess activatedsludge generated by a secondary sedimentation tank of an urban sewage treatment plant as a fermentation raw material, naturally settling to remove supernate and carrying out concentrated treatment toobtain a sludge sample; secondly, mixing the sludge sample with potassium persulfate, pretreating a mixture in a water bath with the temperature of 80 DEG C for one hour, and fermenting in an anaerobic envirnoment to produce the fatty acid. After the excess sludge is pretreated, dissolution of organic matters in the sludge is accelerated, and the activity of acid-consuming microbes of methanogenic bacteria and the like is sufficiently inhibited, so that acid yield is greatly improved, and the anaerobic fermentation time of the sludge is shortened; meanwhile, kinds and quantity of the pollutants in the sludge are reduced. The method provided by the invention is simple to operate and has important environment-friendly ecological significance for reduction, recycling and stabilization.

The invention discloses a method for producing short-chain volatile fatty acid by using tobacco waste. The method concretely comprises the following steps: stirring and evenly mixing the tobacco waste used as a fermentation substrate with sludge used as an inoculant so as to obtain a fermentation substrate; adding alkyl polyglycoside into the fermentation substrate, and carrying out anaerobic fermentation under the condition of stirring. The method can realize reduction, resource and harmless treatment, and has the advantages of being low in running cost, high in earnings, high in yield of the short-chain volatile fatty acid, and the like.

The invention discloses a method for preparing an organic compound fertilizer through sludge generated by processing cassava starch. The method includes the steps: 1) uniformly mixing sludge, grain stillage residue and coal ash according to the mass ratio of 2-5:1:1 to obtain a first mixture; 2) inoculating a microbial inoculant being 4-6% in mass percentage, stacking the first mixture into a stereo trapezoid shape, performing aerobic fermentation for 8-15 days to obtain a first fermentation product, wherein the mixture stack is stirred for 1-3 times every day to control the moisture content to be 25-45% and the temperature to be 40-60 DEG C, and the microbial inoculants is composed of bacillus amyloliquefaciens, bacillus mucilaginosus, bacillus subtilis and bacillus megaterium according to the mass ratio of 1:1:1:1; and 3) adding a nitrogen fertilizer, a phosphorous fertilizer and a potassium to the first fermentation product fertilizer with uniform mixing to obtain a second mixture; and 4) stacking the second mixture into a circular conical shape, sealing the second mixture and performing anaerobic fermentation at 25-35 DEG C for 3-8 days to obtain the organic compound fertilizer which has the effect of increasing yield and improving quality of crops.

The invention relates to a preparation method of hippophae rhamnoides insoluble dietary fibers, and belongs to the technical field of biology. According to the specific technical scheme, hippophae rhamnoides rhizomes, hippophae rhamnoides seeds, male silkworm moths and other raw material are sequentially subjected to anaerobic fermentation, current fermentation and ganoderma lucidum fermentation,and then insoluble dietary fibers are extracted through an enzymolysis method; the insoluble dietary fibers with the hippophae rhamnoides as the main raw material are extracted through the method combining biological fermentation, electrochemistry and enzyme engineering, operation is easy, pollution is little, the purity of the insoluble dietary fibers obtained through the method is obviously improved, and the adsorbability of the produced insoluble dietary fibers in the intestinal tract is enhanced. The method is suitable for large-scale production and popularization.

The invention relates to an anaerobic fermentation method, a fermentation product and an animal feed comprising the fermentation product. During anaerobic fermentation, raw materials are improved biotechnologically, and in particular, a feeding value of plant dregs is increased. The anaerobic fermentation method includes the step of mixing the plant dregs with a hydrocarbon compound and an enzyme. By the anaerobic fermentation method, fermentation time in industrial production is shortened effectively and product nutrition value is enhanced.