61results about How to "Improved Anaerobic Digestion Performance" patented technology

The invention relates to a method for improving anaerobic digestion performance of sludge by utilizing microwave alkaline thermal hydrolysis, and the method belongs to the technical field of solid waste treatment. Alkaline solution is firstly added in the sludge with the solid concentration of 7 percent-10 percent for controlling the pH value of the sludge, the mixing is carried out after adding the alkaline solution, the alkalified sludge is placed in a pressure-bearing reactor, the heating is carried out in a microwave field with the frequency of 2450MHz, the sludge heated by microwave is cooled to the room temperature, and the anaerobic digestion treatment is carried out on the sludge after the cooling. More than 60 percent of organic matters in the sludge which is treated by the method are converted to liquid phase; during anaerobic digestion, the conversion efficiency of the organic matters of the sludge is improved, thereby being an effective means for realizing the whole process pollution control, the energy conservation and the emission reduction of sewage treatment.

The invention relates to a method using charcoal for promoting anaerobic digestion of sludge to produce methane, and the method comprises the following steps: (1) adding 0.5 to 5% by volume of the dry charcoal powder into the sludge to obtain a mixed material, adjusting the mixed material pH value to 7.5-8; and (2) putting the mixed material into a sealed anaerobic digestion device for anaerobic digestion of the sludge in the condition of an intermediate temperate of 30-40 DEG C or a high temperature of 50 to 60 DEG C by means of stirring. Compared with the prior art, the charcoal powder is used as an adding material, organic matters in the sludge are fully recycled and reused, the environment pollution is reduced, the sludge anaerobic digestion time is brought forward by 15-25%, the methane production yield is increased by 40-60%; the method is simple in operation, low in investment and treatment cost, and conductive to reducing environment pollution of the sludge, separation of organic remains produced by the anaerobic digestion of the sludge and the charcoal is not needed, and the organic remains can be directly applied to soil as a soil conditioner.

The invention relates to an advanced oxidation-biological treatment device for non-biodegradable waste water. The device comprises a baffle plate Fenton reactor (6), a precipitating pond (12), a baffle plate anaerobic pond (15) and a contact oxidization pond (18). Waste water to be treated flows through each reaction pond of the baffle plate Fenton reactor in sequence, reacts and enters the precipitating pond for precipitating, supernate in the precipitating pond enters each compartment of the baffle plate anaerobic pond in sequence for undergoing anaerobic digestion, water undergoing anaerobic treatment in the baffle plate anaerobic pond enters the contact oxidation pond for undergoing aerobic treatment, treated effluent enters an oblique-tube precipitating pond, and sludge undergoing secondary precipitation in the oblique-tube precipitating pond returns to the foremost end of the baffle plate anaerobic pond through a sludge reflux pump to realize reduction of the residual sludge, and treated water is stored in the reclaimed water pond. Compared with the prior art, the advanced oxidation-biological treatment device has the advantages of high agent use efficiency, low energy consumption, simple structure and remarkable increase of the sludge digesting efficiency and the gas yield.

The invention relates to a method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge, which comprises the following steps: 1)a calcium peroxide processing unit: placing the calcium peroxide in the sludge, wherein the mass ratio of calcium peroxide to sludge is 0.01: 1-0.6:1, reacting for 1-24 hours, and hydrolyzing the sludge; and 2)an anaerobic digestion unit: after processing the calcium peroxide, performing anaerobic digestion on sludge under the effect of anaerobe and amphimicrobe in an anaerobic digestion tank, rapidly using an organic compound in the sludge, conversing to methane, carbon dioxide and water, increasing the sludge biogas output and then realizing the quantitative reduction. Compared with the prior art, the method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge has the advantages of low cost, shortened digestion time and easy enforcement.

The invention relates to a multistage anaerobic digestion strengthened gas production method mainly comprising the steps of front-stage anaerobic digestion, high-temperature and high-pressure thermal hydrolysis and back-stage anaerobic digestion. After sludge is subjected to the front-stage anaerobic digestion treatment, easily-degraded organic matters are sufficiently decomposed and converted into marsh gas, the residual part mainly comprises difficultly-biodegraded organic matters and facultative bacteria which adapt to the anaerobic environment and can not be digested and utilized, and the organic matters account for over 50% of the total organic matters in the sludge and restrict the development of anaerobic digestion. The discharged material subjected to the front-stage anaerobic digestion is subjected to the high-temperature and high-pressure thermal hydrolysis treatment to force a cell wall to crack, substances in a cell to be dissolved out and a colloid structure of an extracellular polymer to be broken, so that parts of difficultly-biodegraded organic matters are converted into the easily-degraded organic matters; the sludge subjected to the thermal hydrolysis treatment is added into a back-stage anaerobic digestion system to further realize the degradation and anaerobic gas production of the organic matters. By using the multistage anaerobic digestion strengthened gas production method, the degradation rate and gas production rate of the organic matters in the sludge are radically increased, the quantity and volume of the sludge are reduced, the sludge stabilizing effect is enhanced, and the quality of anaerobic digestion sludge is improved.

Belonging to the technical field of solid waste treatment, the invention relates to a method for promoting anaerobic digestion of excess sludge through pretreatment of ultrasonic waves and hydrogen peroxide. The method comprises: subjecting the excess sludge of an urban sewage treatment plant to gravity thickening, then adding a certain amount of hydrogen peroxide, conducting rapid stirring and sending the sludge into an ultrasonic reactor for ultrasonic treatment, in which the combined action of ultrasonic waves and hydrogen peroxide destroys the bacterial cell wall structure of the sludge, thus leading to leakage of the cell contents and content increase of dissolved organic matters in water, then sending the treated sludge into an anaerobic digestion reactor for subsequent mesophilic anaerobic digestion; delivering the biogas generated from anaerobic digestion to a gas collection gas for comprehensive utilization. After treatment, the concentration of SCOD (soluble chemical oxygen demand) in the liquid phase sludge can be increased by 23.83 times to 41.18 times, the biogas output can be increased by 17.40%-55.37%, and the methane content of the biogas can be increased by 10%-20%, thus reducing the energy consumption of ultrasonic treatment. For sewage treatment plants of different scales, only by making corresponding modification on existing facilities can good effects be achieved.

The invention relates to a method for utilizing enhanced pretreatment to promote the anaerobic digestion of excess sludge, belonging to the technical field of solid waste treatment. The method comprises the following steps of gravity concentrating excess sludge in urban sewage treatment plants, and then adding certain amount of sodium hypochlorite, stirring the sodium hypochlorite fast with the excess sludge, and then feeding the mixture into an ultrasonic reactor to perform ultrasonic treatment. With the coaction of the ultrasonic and the sodium hypochlorite, the bacterial cell wall structure in the sludge is damaged, the inclusion of the cell is discharged, the content of soluble organic substance in the water is increased, after certain time of treatment, the sludge is fed into an anaerobic digestion reactor to perform subsequent medium temperature anaerobic digestion; the biomass gases generated by the anaerobic digestion are comprehensively utilized through a gas collection device. The concentration of SCOD (soluble chemical oxygen demand) in the sludge liquid phase is improved by about 27 times after the treatment, the biomass gas yield is increased by 54.4%, and the content of methane in the biomass gas is improved by about 10%, so that the energy consumption of the ultrasonic treatment is reduced greatly. With the adoption of the method provided by the invention, for the sewage treatment plants with different sizes, a good effect can be obtained by performing corresponding reconstructions on the existing treatment facilities.

The invention belongs to the technical field of sludge treatment, and discloses a sludge treatment and resource utilization method based on pyrohydrolysis and application of the sludge treatment and resource utilization method based on the pyrohydrolysis. The sludge treatment and resource utilization method based on the pyrohydrolysis comprises injecting sludge with moisture content of 75%-90% into a reaction kettle, then injecting saturated steam with pressure of 1.5MPa-2.5MPa into the reaction kettle, stopping injecting the saturated steam when the temperature of the sludge reaches 150DEG C-185DEG C, maintaining the state for 0-25min, and obtaining slurry of the pyrohydrolysis; carrying out mechanical dehydration on the slurry, and obtaining desorption liquid and dehydration mud cakes; and carrying out an anaerobic digestion reaction on the desorption liquid, and obtaining methane. Processing temperature of the pyrohydrolysis is low, heating time of the sludge and total processing time of the sludge treatment and resource utilization method can remarkably reduced, processing efficiency is improved, energy consumption is reduced, and cost is saved. The dehydration mud cakes obtained by the sludge treatment and resource utilization method can serve as raw materials of organic fertilizer, the obtained methane can be used for fuel of a boiler system, and finally reduction, harmless performance and recycling of the sludge are achieved.

The invention belongs to the technical field of sludge treatment, and discloses a method for treatment and resource utilization of sludge based on low-pressure catalytic thermal hydrolysis and an application of the method. The method comprises the following steps of: injecting a catalyst and sludge with the water content of 75-90% into a reaction kettle, then injecting saturated steam with the pressure of 1.0-1.59MPa into the reaction kettle, and heating the sludge mixed with the catalyst, thus obtaining slurry after reaction; performing mechanical dehydration on the slurry to obtain removing liquid and dehydrated mud cakes; and performing anaerobic digestion reaction on the removing liquid to prepare a marsh gas. According to the method, the treatment time can be greatly shortened and the treatment efficiency can be improved by adding the catalyst, and the energy consumption and the running and investment costs are reduced at the same time. The marsh gas prepared by the method can be used as a fuel for a steam boiler in a system or can be sold; the dehydrated mud cakes can be prepared into a biomass fuel which can be used by boilers in the system or can be sold; and meanwhile, the mud cakes can also be used as an organic fertilizer raw material sold to fertilizer plants, so that the thorough harmlessness and recycling of the sludge are realized.

The invention discloses a pretreatment method of two-stage electrochemical reinforcement of the anaerobic digestion performance of sludge. The method is composed of two parts, i.e., two-stage electrochemical pretreatment and anaerobic fermentation of sludge. Through the electrochemical pretreatment, residual sludge of a sewage treatment plant is improved in the performance of anaerobic digestion for production of biogas. Specifically, residual sludge from the sewage treatment plant is concentrated, then subjected to the two-stage electrochemical pretreatment and then added into an anaerobic fermentation tank. Through reinforcement of the two-stage electrochemical pretreatment, the accumulative methane output after anaerobic digestion of the residual sludge from the sewage treatment plant is increased by 0.5 to 1.5 times and retention time needed for stabilization of the sludge is reduced by 5 to 9 d compared with one-stage electrochemical pretreatment with same energy consumption. The method is applicable to treatment of the residual sludge of the sewage treatment plant and recovers biomass energy included in organic matters in recovered sludge in the form of methane; and the method is also applicable to reconstruction of conventional anaerobic digestion systems for sludge so as to improve the benefits of anaerobic digestion of sludge.

The invention provides a soil remediation fertilizer prepared from kitchen waste as well as a preparation method and an application of the soil remediation fertilizer. The soil remediation fertilizeris prepared from kitchen waste subjected to anaerobic heat treatment, a complex microbial inoculant and a synergistic component. The soil remediation fertilizer prepared from the kitchen waste can reduce resource waste and effectively improve the problems of grease, germs and worm eggs of the kitchen waste, so that the physical, chemical and biological properties of soil are effectively improved,soil nutrients are maintained, and the utilization rate of the soil nutrients is increased.

The invention belongs to the technical field of sludge treatment, and discloses a method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and an application of the method. The method comprises the following steps of: injecting a catalyst and sludge with the water ratio of 75-90% into a reaction kettle, then injecting saturated steam with the pressure of 1.0-1.59MPa into the reaction kettle, stopping injecting the saturated steam when the temperature of the sludge reaches 60-80 DEG C, and maintaining the situation for 2 to 25 minutes, thus obtaining slurry after reaction; and performing anaerobic digestion reaction on the slurry to prepare a marsh gas. According to the method, the thermal hydrolysis time can be greatly shortened and the treatment efficiency can be improved by adding the catalyst, so that the energy consumption, the running cost, the equipment investment cost and the maintenance cost are reduced. The marsh gas prepared by the method can be used as a fuel for a steam boiler in a system or can be sold, and the purchased energy sources required by sludge treatment are reduced when the marsh gas is used as the fuel for the steam boiler in the system, so that the treatment cost is reduced, and the thorough harmlessness and recycling of the sludge are realized.

The invention discloses a method for treating residual active sludge. The method comprises: feeding remaining active sludge into a homogenization groove, adding a treatment agent to the homogenizationgroove, treating, carrying out thermal hydrolysis wall breaking treatment on the treated sludge, feeding the wall-broken sludge into a sludge dewatering machine, dewatering to obtain dewatered mud cake and sewage, feeding the sewage to a sewage treatment plant so as to be further treated, and carrying out molding drying on the obtained dewatered mud cake to obtain dried sludge. With the method ofthe present invention, the water content of the remaining sludge can be reduced to less than 15%, the volume of the sludge can be greatly reduced, and the dried sludge can be used as the further resource raw material or can be incinerated.

The invention discloses a UBF anaerobic reactor based on a biochar carrier. The UBF anaerobic reactor comprises a reaction tank, a biological filler layer is arranged on the upper portion of the reaction tank, a water inlet pipe is arranged on one side of the reaction tank, a sludge discharge pipe is arranged on the other side of the reaction tank, and the sludge discharge pipe, a water distributor, a granular sludge layer, the biological filler layer, an effluent weir and a gas collection port are sequentially arranged on the reaction tank from bottom to top. The anaerobic digestion capability of anaerobic microorganisms on sewage is improved through the biochar, and the anaerobic microorganisms in the reaction tank mainly exist in a biological membrane on the surface of a filter material through the biological filler layer, so that the quantity and activity of the microorganisms in the reaction tank are improved; according to the invention, the sewage treatment capability, the pollutant load impact resistance and the stability of a traditional UBF anaerobic reactor are improved, and the UBF anaerobic reactor has the characteristics of simplicity in operation, high treatment efficiency and the like.

The invention discloses a device and a method for treating organic matter with high water content. The device comprises a material charge unit, a hydrothermal drying unit, a press filtering unit, a liquid storage unit, a thermal conversion unit and a solid storage unit, wherein the to-be-treated organic matter with high water content can be sequentially sent into the material charge unit, the hydrothermal drying unit, the press filtering unit and the thermal conversion unit; the hydrothermal drying unit is provided with an air inlet, an air outlet, a first heating device and a second heating device; the press filtering unit is a mechanical press filtering unit; the thermal conversion unit comprises a second heating device and a second temperature control device. The device has the advantages that the water content of the organic matter with high water content can be well reduced via the in-situ hydrothermal dewatering, and the organic matter with high water content after reducing of water content is thermally converted to obtain the product with higher quality; the device is an integral combined device, so that the operation is convenient, and the treatment efficiency of the organic matter with high water content is higher.