907 results about "Dewatered sludge" patented technology

A closed multi-room fluidized bed sludge drying method is provided, which is a sludge drying method having the advantages of simple equipment structure, convenient operation, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc. After the mechanically dewatered sludge is mixed with the back-mixed sludge, the mixture is dried room by room in an inert particles multi-room fluidized bed dryer (3). The first room and the second room of the inert particles multi-room fluidized bed dryer (3) adopt inert particles (f) as heat storage medium. Gas from a cyclone separator (5) goes through a spray tower (7) and returns into an air heating unit (4) through a circulating fan (10). Part of dried sludge (e) at the lower part of the cyclone separator (5) enters the inert particles multi-room fluidized bed dryer (3) through the back-mixing in a mixer (2). Waste liquid from the bottom of the spray tower (7) enters a waste liquid circulating pool (8), with part of waste liquid circulating into the spray tower (7) and part into a sewage treatment system.

The present invention discloses one kind of haydite produced with dewatered sludge, fly ash and clay as material and its production process, and belongs to the field of environment technology. The haydite is produced dewatered sludge, fly ash and clay as material, and through mixing and sintering at gradually raised temperature. It is yellow or brown spherical solid in the bulk specific weight of 650-750 kg/cu m, granular specific weight of 1050-1150 kg/cu m, water absorption of 5.80-10.8 %, and specific surface area of 2.29-5.56 sq m/g. The production process is simple and low in cost, and the haydite has light weight, high strength, small water absorption, great specific surface area and other features. The haydite has wide use in building, environment protection, metallurgy, chemical industry, and other industry.

Methods to improve dewatering in industrial and municipal sludges are described. One method involves admixing sludge from a papermaking process and modified cellulose to provide modified sludge with the modified cellulose present in an effective amount to improve dewatering in the treated sludge, such as in allowing use of reduced amounts of coagulant and/or reducing dewatering times, increased dewatered volumes, and reduced sludge product moisture contents, and the like. The dewatered sludge may be formed into a dried particulate, and may be used as filler or other component of concrete, rubber, asphalt, plastics, resin-wood composite products, and other composite products.

The invention discloses a sludge biological carbonizing technology based on hydrothermal reaction. The sludge biological carbonizing technology comprises the steps as follows: 1) dewatering the sludge, and transferring the sludge into a sludge pre-storage bin to be stored; 2) preheating the dewatered sludge; 3) transferring the preheated dewatered sludge into a hydrothermal reactor, thus obtaining hydrothermal lysis solution; 4) returning the hydrothermal lysis solution into a preheating system to preheat the dewatered sludge, and cooling the hydrothermal lysis solution so as to obtain a gaseous product; 5) transferring the cooled hydrothermal lysis solution into a filter press for filter pressing, thus obtaining a reacting filtrate and a solid product; 6) drying the solid product produced in previous step, and then transferring the solid product into a dry type carbonizing furnace to be carbonized, so as to obtain the solid biological carbon and other products, and transferring the other products into a gas-liquid separating device to be separated so as to obtain combustible gas and tar; and 7) transferring the gaseous product obtained in step 4) and the combustible gas and tar obtained in step 6) into a firebox to be burnt so as to generate heat; and supplying the generated heat to a hydrothermal reactor and the dry type carbonizing furnace. With the adoption of the sludge biological carbonizing technology disclosed by the invention, the product with high additional value can be obtained; and meanwhile, the energy can be saved.

The present invention relates to one kind of organic soil conditioner prepared with city sludge and its production process. The material for the organic soil conditioner consists of dewatered sludge from city domestic sewage 53-72 wt%, organic agricultural waste 4-18 wt%, inorganic supplementary material 2-15 wt%, fertilizer balancing agent 1-5 wt%, and composite microbes 0.5-2 wt%. The production process of the organic soil conditioner includes the following steps: 1. fermenting the dewatered sludge from city domestic sewage, the organic agricultural waste and the inorganic supplementary material with saccharomycetes; 2. inoculating the composite microbes to the first fermented product for secondary decaying; and 3. sieving and packing to produce the organic soil conditioner. The organic soil conditioner has high nutritious component content, and can improve physical and chemical structure of soil, improve agricultural product quality and raise soil fertility.

The invention relates to a sludge drying and incineration combined treatment method with good treatment effect, wide sludge adaptability, and safe and stability system. To avoid agglomeration of mechanically dewatered sludge (k) in a fluidized bed dryer (6), a part of dried sludge (c) is premixed with the mechanically dewatered sludge (k) and then fed into the fluidized bed dryer (6). The dried sludge (c) is incinerated into a circulating fluidized bed incinerator (1) to generate superheated vapor. The superheated vapor is condensed to hot water in a heat exchange tube (6-2) of the fluidized bed dryer (6) and then recycled to the circulating fluidized bed incinerator (1). The arrangement of buried pipes (1-3) and fractional air supply inside the circulating fluidized bed incinerator (1) can effectively control the lower temperature of the circulating fluidized bed incinerator (1) to prevent deflagration of dried sludge. The entire system has no emission of pollutants such as unpleasant odor, acidic gases, heavy metals and dioxin; is safe and reliable; and can operate for a long time.

The invention discloses a biological drying method for treating dewatered sludge of an urban sewage plant, and belongs to the technical field of solid waste treatment. The method comprises the following steps: adding an alkaline cracking agent into the dewatered sludge, uniformly mixing, adding a conditioning agent, and adding an inoculating agent for inoculation or utilizing a biological drying finished product for reflux inoculation; after uniformly stirring the mixture, placing the mixture in a biological drying reactor, and introducing residual heat, wherein the temperature of hot wind is between 80 and 120 DEG C, the ventilation amount of each 1kg of mixture is between 15 and 150 L/h, and the temperature of the reactor is between 50 and 60 DEG C; connecting a hot wind outlet to a gas drier, removing moisture, and treating and discharging residual gas; and performing once mechanical stirring for 3 to 5 minutes per hour, and treating 3 to 5 days to obtain the treated sludge. The residual heat adopted by the method has wide source; a drying product can be used for fueling, fertilizing, preparing a soil modifying agent or directly dumped; the drying time is remarkably reduced; and the biological drying method has the advantages of simple technology, low cost, economy and high efficiency.

The invention relates to a method for improving dewatering performance of excess sludge by combining biological acidification and Fenton-like oxidation, which belongs to the technical field of sludge treatment. The method comprises that: under the condition of adding a sufficient quantity of substrates, indigenous acidification bacteria serving as inoculation liquid are cultured and acclimatized from sludge; the inoculation liquid is added to excess sludge in order to perform biological acidification on the sludge under an aerobic stirring condition in the presence of a sufficient quantity of substrates till the pH of the sludge is 2 to 3; under the catalytic action of Fe2+ and Fe3+, H2O2 produces strong oxidative free radicals and other Fenton-like oxidized sludge; Ca(OH)2 solution is added to the treated sludge to regulate the pH of the sludge to be between 6 and 7; and the treated sludge is dewatered by a plate-frame pressure filtration method or a centrifugal dewatering method in order to obtain dewatered sludge with water content between 65 and 75 percent. The combination of biological acidification and Fenton-like oxidation for improving the dewatering performance of excess sludge can improve reaction efficiency, shorten reaction time, increase treatment capacity and reduce cost for sludge treatment.

The invention relates to curing agent used for curing and stabilizing dewatered sludge produced by a sewage plant. The invention is characterized in that curing material and assistant curing material bentonite are added by weight in the dewatered sludge, and each component is mixed evenly, and the weight percentage of each component is 30 to 80 percent of sludge, 15 to 30 percent of curing material, and 5 to 40 percent of bentonite. The curing material is formed by concrete, lime, fly ash and gypsum by weight. The invention has the advantages that the disposed sludge can be disposed by burying to be as fillings for the using of renewable recources. The curing agent can improve the high water content and the low intensity of the sewage, and has the advantages of increasing curing effect, reducing curing material use amount and reducing disposal cost. The compositions of the curing agent of concrete, fly ash, lime, gypsum and bentonite have wide distribution and low price with finished produces selling, thereby realizing the industrialization of sludge curing and stabilizing techniques.

The invention provides a high temperature carbonization system of sludge and a carbonization process. The high temperature carbonization system of sludge comprises a dewatered sludge supply unit, a dewatered sludge drying unit, a dried sludge carbonization unit, a thermal cycle exchange unit, and a carbonization heating furnace, wherein the dewatered sludge drying unit comprises a dewatered sludge dryer; the dried sludge carbonization unit comprises a sludge carbonization furnace; the carbonization heating furnace is used for supplying the heating gas to the dewatered sludge dryer and used for supplying the heating gas to the sludge carbonization furnace; the thermal cycle exchange unit is used for conveying the heating gas discharged by the dewatered sludge drying unit to the carbonization heating furnace to burn and deodorize after heat exchange; and the carbonization heating furnace is used for burning and deodorizing the distilled gas generated by the sludge carbonization furnace by carbonization. By adopting the carbonization system, utilization of the carbonized distilled gas generated by the sludge in drying and carbonizing processes is combined with high-temperature deodorizing overall treatment of the waste gas; the energy consumption is reduced; and the equipment configuration is also simplified.

The invention provides an urban sludge treating method, which comprises the following steps of: heating concentrated sludge to 45-55 DEG C, feeding into a high-temperature hydrolytic acidification reactor, and undergoing a high-temperature hydrolysis anaerobic digestion reaction at the pH 6.5-7.5 and at the temperature 40-55 DEG C for 2-5 days to obtain a hydrolytic acidification product; lowering the temperature of the hydrolytic acidification product to 35-40 DEG C, feeding into a medium-temperature methane producing digestion reactor, and undergoing a medium-temperature hydrolysis anaerobic digestion reaction at the temperature 35-38 DEG C for 10-17 days to obtain marsh gas and digested sludge; desulfurizing the marsh gas; and dehydrating the digested sludge to produce dehydrated sludge and digestive fluid. According to the method, resource, minimization and harmlessness of urban sludge treatment are fully realized. The invention further discloses urban sludge treating equipment, which comprises the medium-temperature methane producing digestion reactor, a dehydrator, a desulfurizing tower, a high-temperature hydrolytic acidification reactor and a heat exchanger, wherein a heater is arranged on the high-temperature hydrolytic acidification reactor. The equipment has a simple overall structure, and is easy to realize.

Provided are a sludge reduction and recycling treatment device and a sludge treatment method. The method includes the steps of performing spray drying on dewatered sludge, mixing coal pyrolysis, using pyrolytic carbon incineration ash as a raw building material, recycling pyrolysis oil and pyrolysis gas as supplement energy, performing up-to-standard discharging on flue gas emitted by a pyrolysis furnace after subjecting the flue gas to treatment in a spray tower, a mist removal device and an activated carbon adsorption bed, and supplying an incinerator with low heat of the pyrolysis furnace. The sludge reduction and recycling treatment device and the sludge treatment method have the advantages of being capable of achieving a sludge recycling recovery rate of 95%, a sludge reduction rate of over 96%, a heavy metal solidification rate of 95% and zero emission of pollutants; the generation of harmful gas such as dioxin is inhibited due to fully-enclosed oxygen-free environment pyrolysis and sulfur in coal; residual dioxin can be decomposed by being burnt at the temperature above 950 DEG C so as to ensure no generation and emission of dioxin in an entire reaction process of a system; a mixture of flue gas, low heat, pyrolysis gas and pyrolysis oil can be recycled, so that energy consumption and treatment costs are reduced.

The invention discloses a method and equipment for supercritical treatment and resource utilization of dewatered sludge of a sewage plant. The method is characterized in that: the dewatered sludge (the water content is 77 to 85 percent) is directly treated in a supercritical water vaporization mode, the flowability of the sludge is improved through a high-speed stirring device, blockage of a tubular reactor is prevented by adopting a high-pressure fluidized bed device, high heat of a gas-liquid separation process is fully utilized, and the low-temperature sludge is heated by using a heat exchanger; and the liquid phase product with high ammonia nitrogen content is directly recycled by a magnesium ammonium phosphate (MAP) method. The method has the advantages that: any moisture is not added in the vaporization process, and the sludge treatment efficiency is high; the heat can be utilized in the process; ammonia nitrogen in the liquid phase product is timely reclaimed so as to reduce secondary pollution; the reclaimed supernate can be recycled, the periodically discharged solid phase product with low heavy metal content can be directly used as a phosphate fertilizer, and the solid phase product with high heavy metal content can be used as an adsorbent; and the treatment expense of the whole system is reduced by resource utilization of the liquid phase product and the solid phaseproduct.

Methods, apparatus and systems for dewatering and drying the dewatered sludge. Sludge pumped into the sludge dewatering apparatus is mixed in-line with a pre-measured quantity of polymers to agglomerate solids entrained in the sludge. The agglomerated sludge is routed to a filtration station comprising filtration chambers. The filtration chambers are fitted with industry standard filter bag. The agglomerated sludge is subjected to dewatering in the filter bags and the dewatered sludge is subsequently compacted, dried and discarded.

Relating to the technical field of sludge treatment, the invention discloses a sludge deep dewatering treatment system and a process specific to the problems that the water content of dewatered sludge cannot reach the national standard and the heat energy loss is great in existing sludge dewatering technologies. The treatment system comprises a volute sludge dewatering device, a sludge wall breaking modification device, a high pressure elastic squeezing device, a sludge transportation device and a wastewater treatment discharge device that are connected in order. The treatment process includes the steps of: a. concentration: subjecting primary sludge to concentration by means of mechanical extrusion; b. modification: mixing the concentrated sludge with curing conditioners in the sludge wall breaking modification device uniformly to make the discharged sludge reach modification requirements; and c. filter pressing: carrying out filter pressing on the modified sludge so as to obtain a sludge cake with a water content of less than 60%-50%. The treatment system and process provided in the invention are especially suitable for deep dewatering on sludge.

The invention discloses an immobilized nitrobacteria enrichment culture method and device in a sewage treatment process. A sequencing-batch biomembrane activated sludge process is utilized to perform enrichment culture on nitrobacteria: dewatered sludge is inoculated in an immobilized nitrobacteria culture device, and an enrichment culture solution is added; and in the nitrobacteria enrichment culture process, the biomembrane ammonia nitrogen load is gradually enhanced, and the pH value is controlled. The enrichment culture solution is formed by mixing NH4HCO3 and pretreated municipal sewage, the ammonia nitrogen concentrations are respectively 100, 300, 500, 700 and 1000 mg/L, and the COD (chemical oxygen demand) concentration is 30-60 mg/L. By controlling the immobilized nitrobacteria culture device, the DO in the reaction mixture is 2-6 mg/L, the pH value is 6.5-8.0, the biofilm-formation acclimatization culture temperature is 10-14 DEG C, and the enrichment purification culture temperature is 15-25 DEG C. The device can be used for culturing nitrobacteria at low temperature, and the nitrobacteria content is up to 40-45%. The immobilized nitrobacteria have high low-temperature nitration resistance, and can treat the wastewater of which the ammonia nitrogen concentration is up to 1000 mg/L, so that the ammonia nitrogen in the wastewater is lowered to 1.0 mg/L or below.

The invention discloses a low-consumption high-effective sludge drying method in the solid waste disposing technical domain, which is characterized by the following: introducing condensed sludge at certain proportion into anaerobic digestion tank; adopting partial methane from digestion tank to generate overheat steam and other methane to burn or generate power; making digestive sludge into mechanic hydrolytic chamber; introducing hydrolytic sludge into overheat steam drying device; evaporating water in the sludge; dehydrating; sterilizing; refluxing overheat steam into anaerobic digestion tank; circulating overheat steam after condensing and deodorizing.

The invention discloses a method for preparing ultralight ceramsites from clay iron-containing tailings. The ultralight ceramsites are prepared from the following raw materials in percentage by weight according to dry basis weight: 40-48 percent of clay iron-containing tailings, 40-48 percent of coal series kaolinite or coal gangue and 8-15 percent of dewatered sludge; the method comprises the following preparation processes: mixing materials, pelletizing, drying, preheating, calcining and cooling; under an optimum formula and process conditions that the preheating temperature is 500-600 DEG C, calcination temperature is 1250-1350 DEG C, and the heating rate is 10-15 DEG C/min, the all-solid waste ultralight ceramsites with the bulk density of 390 kg/m<3>, cylinder compressive strength of 1.2 MPa and the water absorption of 3.8% can be prepared through firing, and meet requirements of GB/T17431.1-2010, a novel approach is developed for abundant utilization of tailings, coal gangue and dewatered sludge and obvious economic benefits, environmental benefits and social benefits are realized.

The invention relates to an on-site biological sludge harmless disposal method and equipment. The dewatering and drying treatment method used in a biological sludge plant comprises the following steps: (1) a sludge dewatering process: biological sludge generated by wastewater treatment is fully mixed with a treatment chemical through a mixer to become diluted sludge which is then dewatered by the sludge dewatering extruder; (2) a sludge drying process: the dewatered sludge is subjected to harmless disposal, then dried sludge is added to control the water content to be 48-52%, and after that, a sludge drying extruder is adopted for drying. A sludge drying extruder comprises a screw cylinder casing with a screw mechanism arranged therein, and the screw mechanism comprises a hollow cylinder screw and a screw propeller. A sludge dewatering extruder comprises a filtering screw cylinder with a screw mechanism arranged therein, the screw mechanism comprises a hollow cylinder screw and screw blades arranged at the outer edge of the hollow cylinder screw, and 6-10 scrapers are embedded between the screw blades and are perpendicular to the hollow cylinder screw in the longitudinal direction.