2176results about How to "Improve dehydration effect" patented technology

The invention relates to a wound treatment item having a proportion of modified natural fibers or synthetic fibers with a high dehydrating capacity.

The invention discloses a method and a device for treating garbage percolate, wherein the method comprises the steps of pretreatment, anaerobic treatment, membrane biochemical treatment, nanofiltration treatment, sludge treatment and the like; the device comprises a primary sedimentation tank (1) and an adjusting tank (2), the adjusting tank (2) is connected with an anaerobic reactor (3), the anaerobic reactor (3) is connected with a denitrification tank (4), and the denitrification tank (4) is communicated with a nitrification tank (5); and the nitrification tank (5) is connected with an ultrafiltration apparatus (6), and the ultrafiltration apparatus (6) is connected with a nanofiltration device (7). The method and the device achieve COD degradation of high-concentration wastewater so that the COD of high-concentration COD of 50,000 reaches about 50 after treatment and reaches the standard of industrial reuse water, thus the method and the device achieve zero discharge of the percolate, initiate a new attempt to treat high-concentration percolate, and fill up the domestic blank.

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.

A method of dewatering corn stillage solids comprising adding to the solids an effective coagulating and flocculating amount of an anionic copolymer comprising acrylic acid sodium salt, methacrylic acid sodium salt or 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt to form a mixture of water and coagulated and flocculated solids; and separating the water from the coagulated and flocculated solids using a dewatering device.

The invention relates to the technical field of residual sludge treatment, in particular to a process method for conditioning and dehydrating residual sludge. The method particularly comprises the following steps: (1) adding acid into the residual sludge to be treated and with the water content of 90 to 95 percent and adjusting until the pH value is between 4.0 and 6.0; (2) adding quaternary ammonium salt cationic organic matters into the conditioned sludge in the step (1) and performing hybrid reaction; (3) adding a dehydration aid into the conditioned sludge in the step (2) and stirring uniformly; and (4) adding coagulant into the conditioned sludge in the step (3) and mechanically dehydrating after mixing and stirring. The extracellular polymers on sludge flocs are stripped and partially hydrolyzed by a chemical conditioning mode, microbial cells are dissolved, a large amount of bound water is released, and the water permeability of the sludge is improved by utilizing the aid, so that the dehydration performance of the sludge is integrally improved, the water content of the sludge is reduced, the dehydration time is shortened and the dehydration cost is reduced.

The present invention discloses a sludge dewatering conditioning agent, which comprises, by weight, 30-70% of desulfurization ash, 5-15% of a magnesium salt, 5-30% of an iron salt, 2-20% of an aluminum salt, and 0.1-15% of magnesium oxide. The invention further provides a dewatering method of the conditioning agent, wherein the dewatering method comprises conditioning agent solution preparing, sludge conditioning, flocculant solution preparing, sludge dewatering and other steps. According to the present invention, the characteristics of wide used raw material source, and low raw material price, low preparation cost and good dewatering effect are provided, the method can be performed through the existing sludge dewatering facility, the implementation process is simple, the stability and the reliability of the sludge dewatering process can be effectively improved, and the sludge dewatering conditioning agent and the dewatering method can be widely used for treatments of various wastewater, sewage and sludge.

The invention discloses a 'technique for conditioning sludge by using the synergic action of Fenton reagent and polyacrylamide', and mainly aims to overcome the defects in sludge dehydration conditioning of urban sewage treatment plants at present. The invention provides a sludge conditioning combined technical process which can effectively degrade organic substances, realize sludge reduction, effectively release combined water and cell internal water difficult to be dehydrated in the sludge and improve the dehydration performance of the sludge. In the technique, the oxidizing action of the Fenton reagent and the strong flocculation of CPAM (cationic polyacrylamide) are fully combined and used to enhance the dehydration performance of the sludge and improve the solid-liquid separation ratio in sludge dehydration. Through conditioning, the water content of the sludge after centrifugal dehydration is reduced from 87.7 percent to 79.3 percent, and the mud cake output is reduced from 0.218t/m<3> to 0.128t/m<3>.

The invention discloses a sludge deep dehydration conditioning agent and application thereof. The sludge deep dehydration conditioning agent consists of an inorganic polymer flocculant, an iron compound, an organic polymer flocculant and a calcium compound. The sludge deep dehydration conditioning agent is low in cost and less in dosage, and can effectively reduce the sludge dewatering cost. After being conditioned, sludge is low in dewatering pressure, operation energy consumption and cost, and the moisture content of the sludge can be directly reduced to less than 60%, so that the subsequent treatment for the sludge can be more conveniently carried out. A sludge deep dehydration method comprises the steps of: adding the inorganic polymer flocculant and the iron compound into the sludge, evenly stirring, then adding the organic polymer flocculant into the obtained mixture, and evenly stirring; after that, adding the calcium compound into the obtained mixture, evenly stirring so as to obtain the conditioned sludge; and finally, carrying out filter pressing and dehydration on the conditioned sludge. The sludge deep dehydration can be realized by low cost and low energy consumption.

The invention discloses a spin drying control method and device of a washing machine and the washing machine. The method comprises the following steps: when the washing machine executes a spin drying procedure, collecting the speed of a spin drying drum of the washing machine and the acceleration of the spin drying drum in the vibration direction in real time; calculating the vibration displacement of the spin drying drum in the vibration direction according to the speed and the acceleration; when the spin drying drum runs at the current-gear speed, judging whether the vibration displacement is greater than a preset displacement threshold corresponding to the current-gear speed; in a low-speed stage of the spin drying procedure, if the vibration displacement is greater than the preset displacement threshold corresponding to the current-gear speed, controlling the washing machine to perform loose shaking work; otherwise, controlling to increase the speed of the spin drying drum to the next-gear speed; in a high-speed stage of the spin drying procedure, if the vibration displacement is greater than the preset displacement threshold corresponding to the current-gear speed, controlling the spin drying drum to run at the current-gear speed; otherwise, controlling to increase the speed of the spin drying drum to the next-gear speed.

The invention discloses an innocent treatment method for shield tunneling residue soil. The innocent treatment method comprises the following steps: hydraulically flushing the shield tunneling residue soil by virtue of residue slurry separation equipment so as to separate mud and cleaned gravel particulate matters; processing mud by virtue of a mud treatment process so as to form muddy water and mud blocks; and purifying the muddy water by virtue of a muddy water treatment system. The gravel particulate matters formed after the shield tunneling residue soil is processed can be used as a concrete aggregate, so that the waste is recycled, and the economic value is increased; the mud blocks with low sand content and moisture content can be used as a brick-making material, so that a made brick is good in quality; and the muddy water can be reused after being treated. The matters formed after the shield tunneling residue soil is processed are valuable, the gravel particulate matters can be used as the concrete aggregate, the made brick is good in quality, and the water can be reused, so that the reclamation, reduction and innocent treatment of the shield tunneling residue soil can be realized, the land consumption is reduced, and the natural environment is protected.

With controlling rotate speed of drum in washing machine, the method makes material cast, fall off and delaminate, and then evenly distribute at inner wall of the drum. The invention also offers several control devices used in all kind motors in drum-type washing machine adopting series excited machine and double speed motor.

The invention relates to a subcritical hydrothermal treatment-based efficient recycling treatment process for sludge. According to the treatment process, sludge with the solid content of 10 to 25 percent of a sewage treatment plant is placed into a hydrothermal reaction kettle for 5 to 30 minutes at the subcritical high temperature of 200 to 300 DEG C and under the high pressure of 1.6 to 8.6 MPa, so that intracellular substances in sludge are fully dissolved, solid organic matters are fully dissolved and hydrolyzed and are partially decomposed; the release of bound water and surface water in the sludge facilitates improvement on the dehydration performance of the sludge. The sludge which is subjected to hydrothermal modification is dehydrated to enable the solid content of the dehydrated sludge to be not higher than 60 percent, and then aerobic composting stabilizing treatment is performed. The filtrate which is rich in dissolved organic matters and is obtained by dehydrating the sludge enters a high-speed anaerobic digestion system for fully recovering methane. According to the technology, the hygienization, the recycling and the stabilization of the sludge are realized effectively; the subcritical/supercritical reaction speed is high, the subsequent efficient anaerobic digestion hydraulic retention time is short, and the solid residues generated after hydrothermal modification dehydration are few, so that large-scale urban sludge treatment capacity can be realized by adopting small-capacity reactors in a hydrothermal link, an anaerobic link and an aerobic link of the treatment process.

The invention relates to a biological mud degrading and denitrogenating treating device and the operating method thereof, belonging to environmental protection field, especially relating to a device of strengthening predation of food chain of microbical ecosystem to degrade biological mud and denitrogenating in high performance and the operating method thereof, where the treating device comprises multistage contact oxidation tank, solid-liquid separation settling tank, and anaerobic hydrolyzing tank. And the peculiar propreties of spiral biological carriers in the multistage contact oxidation tank and the flexbilly controllable per-tank substrate concentration and oxygen supply conditions offer various microbes appropriate growth environments, thus composing an ecosystem with a food chain of bacilli, protozoans, metazoans, and senior micro animals. By the food chain, at the middle and rear stages of the multistage oxidation tank, higher microbes can largely prey on the residual mud with bacilli and other lower microbes as the main, thus largely reducing the residual mud.

The invention is named as 'a joint-conditioning dehydration method for sludge', belonging to the technical field of environmental engineering and sludge treatment. The joint-conditioning dehydration method comprises the following steps of: adding H202 and FeSO4 into the sludge (with pH being equal to 5) acidified by mineral acid, degrading organic matter by virtue of strong oxidation of a Fenton reagent, and dissolving and cracking microbial cells and extracellular polymeric substances in the sludge; adding a surfactant CTMAB (Cetyl Trimethyl Ammonium Bromide) into the sludge to reduce the surface tension of the sludge and change the surface characteristics of the sludge, and transforming a part of interstitial water into free water; and flocculating sludge particulates with disperse structure, small particle diameter and large specific surface area by virtue of flocculation action of polyacrylamide (CPAM) to the sludge particulates. After the sludge is subjected to joint conditioning of the Fenton reagent, the surfactant and the CPAM, the moisture content of the sludge after being centrifugally dewatered is reduced to 78.2% from 87.7%, and the output of mud cakes is reduced to 0.115t/m<3> from 0.218t/m<3>, therefore, the dehydration property of the sludge can be improved remarkably, the investment and operation costs are reduced effectively, and an ideal sludge reduction goal is reached.

The invention discloses a horizontal spring filter plate press comprising a hydraulic device and a pressure filter device; guiding rods are fixed at two sides of the hydraulic device and the pressure filter device; the front end of the hydraulic device is provided with a piston rod which is movably arranged on the guiding rod; the front end of the piston rod is provided with a push plate; the pressure filter device comprises a plurality of groups of pressure filter plates which are connected in an end-to-end way; the pressure filter plates are movably arranged on the guiding rods; the pressure filter plate consists of a main plate, an auxiliary plate and an auxiliary frame; the auxiliary plate is provided with a boss and internally provided with a material cavity for pressing-in of the boss; feeding holes which are communicated with the material cavity are respectively arranged on the main plate and the auxiliary plate; a spring groove is respectively arranged on the main plate and the auxiliary plate and internally provided with a spring device; and the pressure filter plates are also provided with water outlets. The horizontal spring filter plate press has good water-filtering effect, high working efficiency and the effect of saving energy and is a horizontal spring filter plate press which is widely applied in dewatering materials in the industries of foods, chemicals, porcelain, mine, and the like.

The invention discloses a method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal, belonging to the technical field of biochemical process sewage treatment. The high-efficiency removal of total nitrogen in wastewater and the reduction of sludge are realized in the same space by combined action of hydrolysis acidifying bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria. The method is characterized in that part of NO2--N in effluent is reduced by short-chain fatty acid generated by hydrolytic acidification of residual sludge under the action of the denitrifying bacteria; and the other part of NO2--N and ammonia nitrogen released in the hydrolytic acidification process are removed by an anaerobic ammonia oxidation reaction, thereby greatly reducing the concentration of total nitrogen in the effluent and finishing the reduction of the residual sludge simultaneously. The technology is suitable for advanced treatment of high-content ammonia and nitrogen for shortcut nitrification to discharge the effluent.

The invention discloses a treatment method for strengthening the dewatering performance of excess activated sludge, comprising the following steps of: adding electrolyte into the excess activated sludge, heating and stirring to obtain the excess activated sludge with the strengthened dewatering performance after the reaction is completed, wherein the electrolyte is at least one of sodium salt, potassium salt, calcium salt and magnesium salt. Through a normal-pressure hydrothermal electrolyte method, the dewatering speed of the excess activated sludge can be improved, the water content of the activated sludge can be obviously reduced, the treatment method is short in technology, simple in equipment requirement, and convenient to operate, and an important pretreatment condition can be provided for the follow-up treatment and disposal of the excess activated sludge.