155results about How to "Improve water filtration performance" patented technology

The invention relates to an oxygen delignification processing method of grass unbleached chemical pulp. The oxygen delignification of the pulp is processed after cooking and before bleaching. Its rigidity before the oxygen delignification is potassium permanganate value 16-28 (equals to karber value 26-50). After pumping into the oxygen delignification reaction tower and inflating sodium hydroxide, magnesium salt and oxygen, the chemical pulp happen the oxygen delignification in the reaction tower. The chemical pulp with rigidity of potassium permanganate value 10-14 (equals to karber value 14-18) is achieved after the oxygen delignification. The invention can remove the lignin in the pulp effectively and the removal rate is 86-98%. It reduces the degradation of the cellulose to simplify the bleaching process and cut down the dosage of the chemicals. The bleached pulp has good rigidity and drainability. The breaking length of the pulp can reach 4500-8000m and its fold-resistant times can reach 20-70.

The invention provides a process for de-inking waste newspaper by a biologic enzyme, which relates to the process of the pulping of waste paper. The process is characterized by comprising the following technological procedures of: (1) preparing a de-inking agent: adding one or several of alkali lipase, amylase and xylanase into cellulase to prepare a composite enzyme and then adding 0.05-0.15 kilogram of surfactant into the composite enzyme with the weight to form the de-inking agent, wherein the composite enzyme comprises the following components in proportion: 2000-10000U of cellulase, 10000-100000U of alkali lipase, 1000-5000U of xylanase and 8000-15000U of amylase; (2) pulping by using a high-concentration pulper: adding 40-60 DEG C water into the high-concentration pulper, counting by 100 kilograms of absolutely dry paper, putting 10-150 grams of de-inking agent and 0.2-0.4 kilogram of sodium metassilicate nonahydrate into waste newspaper and journal paper and stopping after starting the pulper for 10-30 minutes; and (3) carrying out the procedures of floatation and printing ink separation to obtain the de-inked pulp. The invention has the advantages that sodium hydroxide and hydrogen peroxide are not used, and the production cost and the wastewater pollution are lowered.

The invention provides a method for improving the performance of paper stock in retention and drainage aiding. The method comprises the following steps: firstly, dispersing plant fiber materials for papermaking in water, beating the plant fiber materials with the beating degree being controlled to 25 to 70 DEG SR (Schopper-Riegler); secondly, feeding the evenly mixed slurry into the approach flow system of a paper machine, and adding CPAM (cationic polyacrylamide) as retention agent before feeding the slurry into a fan pump of the approach flow system; then, adding electronegative bentonite before feeding the slurry into a pressure screen or a head box, and adding APAM (anionic polyacrylamide) before feeding the slurry into the head box; and finally, papermaking forming on the paper machine, drying and obtaining the qualified paper. By adding excessive CPAM to the paper machine, the invention allows the action between CPAM and bentonite to form fine particles, and the further combination with APAM to form floccules, thereby providing draining channels in good conditions and further improving the drainage capacity during the forming process of the paper stock.

This invention relates to a synthesis method of quaternary ammonium cationic starch, which takes starch, quaternary ammonium, and sodium hydroxide as raw materials in water medium, and conducts eight steps of conditioning, alkalization, etherification, neutralization, washing, drying, screening, and packaging. The product is white powder, and gels to be the thick translucent gel heated to 50~66deg.C in water with DS values of 0.01 to 0.05. This invention is reasonable, makes the general starch has cationic performance and higher substitution, lowers the gelatinization temperature and freezing, so its effect can completely achieve the requirement of paper industry.

A modifying additive for preparing the tobacco leaf sheet by paper-making method is prepared through proportionally adding acidic proteinase, composite pectase, composite neutral cellulase and neutral lipase in water, stirring, filtering and taking clear liquid. It can be used to treat tobacco stems for improving the flavouring component in liquid extract and the physical properties of tobacco stem and the looseness of tobacco leaf sheet.

The invention discloses a rotary filter screen type bar screen cleaner. The rotary filter screen type bar screen cleaner comprises a frame, a driving device, a transmission chain, two main chain wheels, a main shaft, a cleaning brush, an air inlet pipe, an air nozzle, two traction chains, two secondary chain wheels, a filter frame, a filter screen, a mesh plate, a water stopping plate, and an air compressor; the driving device is fixedly connected to a top plate of the frame, the main shaft is fixed on a side plate of the frame; one end of the transmission chain is sleeved on a power output shaft of the driving device, and the other end is sleeved on a power input end of the main shaft; the main chain wheels are fixedly connected to the main shaft, and the secondary chain wheels are fixed to the lower part of the frame; two traction chains are respectively sleeved to one main chain wheel and one secondary chain wheel; the end part of the filter frame is fixedly connected to the traction chains, the filter screen and the mesh plate are arranged on the filter frame; the cleaning brush is fixed inside the side plate of the frame, brush bristle of the cleaning brush is contacted with the filter screen. By adopting the rotary filter screen type bar screen cleaner, fine floater and suspending solid matters in sewage can be intercepted; and furthermore, cleaning efficiency is high.

The invention discloses a preparing method and application of positive ionic guar gum grafted copolymer retention and filter aid, which comprises the following steps: dispersing non-purified guar gum powder in the low-carbon alcohol/water solution, aerating nitrogen, stirring evenly at indoor temperature, adding positive ionic etherifying agent solution, dripping strong-alkaline catalyst, reacting at 40-75 deg.c to obtain positive ionic guar gum, allocating into colorless transparent solution, adding triggering agent, acrylamide and vinyl cationic monomer, adding adjuvant, reacting at 10-65 deg.c for 2-24h to obtain the product.

The invention provides a method of improving a retention rate of pulp molded fibers. The principle of the method of the retention rate of pulp molded fibers is that pulp is defibered and dried, chemical assistant agents such as oil-proof agents and water-proof agents are added into the pulp. The mixture is evenly stirred and added with cationic polyacrylamide. A huge flocculation cluster is formed through a flocculation reaction of the cationic polyacrylamide and pulp fibers. After tiny pulp fibers are combined with the assistant agents and form the flocculation cluster, as the physico-chemical property is changed so that the pulp are not prone to sweep away by water currents and the retention rate of the pulp is improved. Thus, quality of paper products is ensured and at the same time, economic loss and resource waste due to the fact that the pulp fibers run off are avoided and development prospect and market value are good.

The invention relates to a method of utilizing straw to produce biomass fuel, corrugated paper and organic fertilizer. The method includes: cutting the straw, dusting through a dry process and a waterfilm, washing through hot water extraction for desanding, continuously boiling for hydrolysis, blowing and receiving, performing multistage countercurrent washing, jordaning at high concentration, treating fiber in a staged manner, concentrating long fiber, curing the long fiber, jordaning the long fiber, and using the long fiber to produce the corrugated paper; concentrating the short fiber, subjecting fine and broken fiber to enzymolysis, fermentation and distillation to produce cellulose alcohol, and separating waste mash for utilization. By the method, high-value comprehensive utilizationof each component of the straw is realized, wastewater COD biochemical degradability is high, inorganic salt accumulation is avoided, biogas is produced by high-concentration wastewater in the process and purified as natural gas, and low-concentration wastewater is recycled after being treated, so that a water system is a closed cycle, and there is no wastewater emission; a fine and broken fibercomponent is large in specific surface area and high in enzymolysis efficiency; the corrugated paper produced by a long fiber component is high in strength and quality, and cost of the cellulose alcohol can be lowered; biological natural gas and biomass particle fuel can reduce consumption of mineral fuel.

The invention relates to an application of a modified nano-microcrystalline cellulose serving as a retention and drainage aid for papermaking. Nano-microcrystalline cellulose is prepared by taking wood pulp, microcrystalline cellulose or cotton as raw materials and by adopting an acid hydrolysis method or a bio-enzyme hydrolysis method; the retention and drainage aid for the papermaking is obtained by oxidizing and modifying the obtained nano-microcrystalline cellulose by utilizing a 2,2,6,6-tetramethyl-1-piperidinyloxy-NaBr-NaClO system at the pH value of 10.0 to 10.5 or utilizing a 4-acetamido-2,2,6,6-tetramethyl-1-piperidinyloxy-NaClO2-NaClO system at the pH value of 4.5 to 4.8. The retention rate of fine fibers and fillers can be improved and the filtration performance of paper pulp can be improved by adding 0.05 percent to 2.0 percent modified nano-microcrystalline cellulose into the paper pulp, so that the operating performance of a paper machine is improved. The retention and drainage aid for the papermaking disclosed by the invention is an environment-friendly and green product and has high biocompatibility and biodegradability; the surface negative charge density is high; the retention and drainage aiding effects are good; and moreover, the uniformity of finished product can be improved.

The invention provides a modified starch composition used in the paper-making field. The modified starch composition comprises reaction products by mixing guar gum, an etherified modified compound of starch, a metal silicate and water, wherein the etherified modified compound of starch is an etherified modified compound of original starch and a cationic etherifying agent pre-activated by an alkaline catalyst, the mass of the cationic etherifying agent in the cationic etherifying agent pre-activated by the alkaline catalyst is 5%-15% of the total dry mass of the original starch and the guar gum, the mass of the alkaline catalyst is 1.0%-2.0% of the total dry mass of the original starch and the guar gum; the dry mass of the guar gum is 1.0%-3.0% of the dry mass of the original starch, and the dry mass of the metal silicate is 10%-30% of the total dry mass of the original starch and the guar gum. The invention also provides a preparation method of the modified starch composition and pulp using the modified starch composition. The modified starch composition can effectively improve the retention and drainage properties of the pulp.

The invention provides a method for reducing food packaging paper pulp molded product fiber dosage. The method for reducing the food packaging paper pulp molded product fiber dosage can be achieved through the following technical scheme: in the process of paper pulp molding forming, adding an environment-friendly food grade CaCo3 padding to replace partial plant fiber, and supplementing cationic polyacrylamide (CPAM) of eight million molecular weight to use as a retention auxiliary agent; forming large-size flocculation perssad and achieving modified effect by mix and flocculation effects of the CPAM, the fiber and the CaCO3 padding. The CaCo3 padding and the fine plant fiber have good absorption capacity, the surface of the CaCo3 padding can be better absorbed with the plant fiber, and therefore the purposes of improving fiber retention and reducing pulp product fiber dosage are achieved. The method for reducing the food packaging paper pulp molded product fiber dosage has the advantages of being environment-friendly and high-efficiency, simple and practical, and high in application value.

The invention discloses a straw comprehensive utilization method comprising the following steps: 1, paper product production: (1) straw cutting off; (2) dry dedusting; (3) hot water extraction, countercurrent washing and sand removal; (4) cooking and hydrolyzing; (5) spraying and receiving; (6) multistage countercurrent washing; (7) high-concentration pulping; (8) low-concentration pulping; and (9) papermaking; 2, natural gas production: (1) anaerobic treatment; (2) aerobic treatment; and (3) biogas purification; 3, production of an organic fertilizer: (1) extracting chippings generated by drydedusting in the step 1, plant chippings filtered by hot water extraction countercurrent washing water in the step 1, and solids obtained by solid-liquid separation of multi-stage countercurrent washing water for fermentation production of the organic fertilizer; and (2) mixing the concentrated sludge produced by anaerobic treatment and aerobic treatment in the step 2 with air flotation dross andplant debris, and fermenting to produce the organic fertilizer. The straw comprehensive utilization method provided by the invention is environment-friendly, realizes process wastewater resource utilization, can improve the slurry self-production capability in China, alleviates the problem of lack of fiber raw materials in China, can effectively utilize crop straws, and increases agricultural income.

The invention discloses a method for restoring shriveled inscribed bamboo slips through swelling, and relates to a method for restoring cultural relics of the inscribed bamboo slips, in particular to components of a material for restoring low intensity inscribed bamboo slips and the shriveled inscribed bamboo slips which are obtained in archaeological excavation, and a method for preparing and restoring the same. The method comprises the following steps: (1) cleaning the shriveled inscribed bamboo slips by using distilled water; (2) soaking the cleaned shriveled inscribed bamboo slips in a bamboo swelling material for 3 to 7 days; (3) soaking the swollen shriveled inscribed bamboo slips in a bamboo restoring material for 7 to 10 days; and (4) placing the obtained bamboo slips at a cool and ventilated place to be dried naturally. The method obviously improves the intensity of the shriveled inscribed bamboo slips, strengthens the folding strength, the tearability, the bursting strength and the tensile strength, and improves the drainability. Besides, the method is suitable for restoring the shriveled inscribed bamboo slips through swelling.

The invention discloses cation polyacrylamide retention and drainage aids. The cation polyacrylamide retention and drainage aids are characterized in that cation polyacrylamide retention and drainage aids take a liquefied product for conducting acid catalytic liquefaction on bamboo wood in an alcohols solvent as a cation monomer, cation polyacrylamide is modified, and the cation polyacrylamide retention and drainage aids are obtained. The invention further discloses a preparation method of the cation polyacrylamide retention and drainage aids. According to the cation polyacrylamide retention and drainage aids and the preparation method thereof, the retention rate of paper pulp can be effectively increased, the smoothness, evenness and strength of the surface of the paper are improved, and meanwhile compared with a conventional polyacrylamide product, the biodegradability of cation modified polyacrylamide is greatly improved.

The invention belongs to the technical field of water conservancy projects, and particularly relates to a water gate garbage intercepting and cleaning device for a water conservancy project. The watergate garbage intercepting and cleaning device aims to solve the problem that an existing water gate garbage intercepting and cleaning device is manually cleaned, and manpower is wasted. According tothe scheme, the water gate garbage intercepting and cleaning device comprises a first supporting plate, wherein a first opening is formed in the outer wall of the top of one end of the first supporting plate, and a third filter screen plate is fixedly installed on the inner wall of the first opening; and a water guide opening is formed in the outer wall of the bottom of one end of the first supporting plate, an inclined opening plate is fixedly installed on the inner wall of the bottom of the water guide opening, and second supporting plates which are arranged at equal intervals are fixedly installed on the outer wall of the bottom of the other end of the first supporting plate. According to the water gate garbage intercepting and cleaning device for the water conservancy project, a vibration motor is arranged, the vibration motor can drive a fourth filter screen plate to vibrate, so that the water filtering effect is improved, the weight caused by water in the garbage recovery processis reduced, and the convenience of garbage recovery is improved.

A bamboo pulp refining process, when bamboo pulp is used to make paper, it is first screened to obtain long-fiber pulp components and fine fiber components, and the long-fiber pulp components are refined so that the long-fiber pulp components The effect of chemicalization is obvious, and then mixed evenly with fine fiber components, the final slurry has enhanced water filtration ability, which is suitable for papermaking by paper machine. During the refining process, the long fiber components of bamboo pulp are difficult to separate into filaments, while the cell walls of the fine fiber components are easily broken, and the water absorption and swelling are obvious. The density rises quickly, but because only part of the long fiber components in the pulp are divided into fibers, the surface is fluffed, and the final paper quality is poor; the invention separates the fine fiber components in the bamboo pulp, and only the long fibers are separated. The fiber component is refined by a refiner, so that the long fiber of bamboo pulp is divided into filaments evenly, and then the fine fiber component is added, so that the water filtration capacity of the final pulp is improved, and the quality of the paper is improved.

The present invention discloses the use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nanometer silicon dioxide as papermaking retention and filter aid. In condition of pulp slurry pH of 7-8, the retention and filter aid raises the water filtering performance of straw pulp slurry of beating degree of 38-50 deg SR by 15-26 %, raises the fine fiber and hemi-cellulose retaining rate by 30-50 %, and makes the CaCO3 retaining rate reach 80-89 %. Under the same flocculating effect on CaCO3 suspension, the chitosan quarternary salt has consumption 4-8 % that of cationic starch.

The present invention discloses a kind of water purifying bottle and its water purifying method. The water purifying bottle includes an elastic bottle body, a membrane assembly and a non-return valve. The membrane assembly consists of a connecting part connected to the mouth of the elastic bottle body, and a hollow fiber film with at least one end connected to the connecting part. The non-return valve is connected to the elastic bottle body, the bottle mouth or the connecting part. The water purifying method is to purify water through adding different water treating adsorption or exchange filtering material based on the pollutant in the water to be treated. The present invention is suitable for field use to obtain purified water and may be also used in secondary purification of tap water.

The invention discloses a method for preparing an artificial wetland matrix material by using powdered waste red brick block, and belongs to the technical field of wastewater treatment. The invention mainly solves the problem of disposal of construction waste of waste red brick block; and the waste red brick block is subjected to crushing and grinding to obtain a powdered waste red brick block, which is prepared into an artificial wetland matrix material. The artificial wetland matrix material prepared by the invention has high specific surface area and porosity, is not easily blocked, and can filter and adsorb pollutants in water; and Al<3+>, Ca<2+>, Fe<3+>, Mg<2+> contained in the matrix material can generate a precipitation reaction with phosphorus in water, and are conducive to the removal of phosphorus in wastewater, and trace elements are conducive to the growth of wetland plants. Therefore, the artificial wetland matrix material prepared by the invention can changes the powdered waste redbrick block into treasure, and efficiently utilize resources.