38 results about "Pulp industry" patented technology

The present invention relates to a novel process for decolorization of colored effluents. More particularly it relates to a process for decolorization of colored effluents of textile mills, dye-making industries, paper and pulp industries and molasses spent wash from alcohol distilleries using an unidentified white-rot marine fungus NIOCC #2a isolated from mangrove wood and deposited on Sep. 7, 2004 in the microbial type culture collection (MTCC) of the Institute of Microbial Technology, Chandigarh, India, under the accession number MTCC 5159. Further, this invention relates to decolorization of these effluents using the fungus directly, its cell-free culture supernatant or immobilized fungus or extracellular polymeric substances produced by the fungus. Furthermore, the decolorization of effluents can be carried out from 30° C. to 60° C. and at pH 3 to 6. The decolorization of various colored effluents occurs in the presence of sea water with 25 parts per thousand salinity. Several synthetic dyes are also decolorized under similar conditions of temperature and pH by using free mycelia or immobilized fungus or extracellular culture fluids or extracellular polymeric substances.

The water treating method in pulping process features the multiple washing, extruding and filtering of pulp, and the produced filtrate is returned completely to washing and digesting pulp liquid. By combining with chemical deposition method, all the organic pollutants are converted into the precipitant, so that the water pollution during pulping process is eliminated thoroughly.

The invention discloses a method for separating bark from a stalk and a bark and stalk separator, mainly relates to a method and equipment for separating barks from stalks of crushed cotton stalk, mulberry trees, broussonetia papyrifera and other raw material for pulping and belongs to the technical field of standby materials in the pulping industry. In the invention, the bark and stalk separating equipment is used for separating and is provided with a rotary drum which can rotate and is provided with sieve holes on the surface; and the crushed materials are fed into the bark and stalk separating equipment, the crushed stalk materials are sucked into a cavity of the rotary drum and discharged by using vacuum sucking force and longer bark fibers are attached to the surface of the rotary drum and detached along with the rotation of the rotary drum. The invention has favorable separation effect and high separation efficiency when being used for separating bark from stalk and can be widely applied to the stand raw material in the pulping industry.

The invention discloses a process and a device for pulping by reversely extracting grass raw materials. The process for pulping by reversely extracting grass raw materials utilizes an ethanol-water-superoxide multistage mode. In a boiling stage, the volume concentration of ethanol in an extract is controlled to be from 40% to 65%, the temperature of different segments is controlled to be 90-190 DEG C, the extracting time is controlled to be 40-180 minutes, the liquid ratio is controlled to be 1:4-1:10, and 0.5-5% of superoxide by weight is added to a tail segment of the boiling stage and serves as an assistant. In a pulp washing stage, the temperature of different segments is controlled to be 70-100 DEG C, the extracting time is controlled to be 30-60 minutes, and the liquid ratio is controlled to be 1:3-1:6. The device for pulping by reversely extracting grass raw materials mainly comprises an extractor, a heat exchanger, a liquid storage tank, a flash bucket, a condenser, an ethanol liquid tank, a circulation pump and the like. The process is suitable for the pulping industry, has the advantages of wide adaptability to grass raw materials, low boiling temperature, good pulping quality, easiness in pulp bleaching, low investment, easiness in recovery of high-additional-value byproduct from waste liquid and the like, and can realize pulping cleanly.

The invention discloses a novel energy conservation and environment protection process for realizing the mutualistic symbiosis of a straw pulping and papermaking industry and a waste lead-acid cell recycling industry. According to the alkaline characteristic of the straw pulping sewage, the acidic characteristic of the waste lead-acid cell recycling sewage, and the condition of the coupling utilization space of the after heat, the energy conservation and environment protection process for realizing the mutualistic symbiosis for comprehensive coupling processing the acid-alkali wastewater and complementarily using the heat energy is provided. By adopting the process, the pollution abatement cost and the difficulty of the two industries can be greatly reduced, the energy complementary utilization is realized and the mutualistic symbiosis of two industries is obtaind. By adopting the process, the complementary utilization of the energy sources of two distant related industries is realized, the alkaline black liquid generated by the straw pulping industry and the leaded acidic wastewater generated by the regenerated lead industry can be completely recycled and utilized, so that the problem of high processing cost of the sewages in two industries can be solved and the economic benefits of two industries can be effectively increased.

The invention relates to a process for reusing tail water in papermaking and pulping. The technology comprises the following specific steps of: (1) feeding wastewater into an equalization basin for premixing; (2) transferring the premixed wastewater into an air flotation system, and reducing COD (Chemical Oxygen Demand) and SS (Suspended Solids); (3) transferring the water treated by the air flotation system into an ozone system, and removing partial COD; (4) adjusting pH (Potential of Hydrogen) of the water treated by the ozone system, transferring partial water into an ultrafiltration system for pre-treating; transferring the other part of water into an electro-adsorption system, and directly feeding the water generated by the electro-adsorption system into an allocation system; (5) transferring the water subjected to ultrafiltration treatment into a reverse osmosis system; (6) transferring the fresh water subjected to reverse osmosis treatment into the allocation system for reusing, and transferring the concentrated water subjected to reverse osmosis treatment into an electroosmosis system for concentrating; and (7) feeding the fresh water subjected to electroosmosis into the allocation system for reusing, and feeding the concentrated water subjected to electroosmosis into an evaporating system for treating. The technology for reusing the tail water in papermaking and pulping realizes the recovery of water resources in the papermaking and pulping industry, and the treated water can be allocated according to the demand on water use of an enterprise, thus meeting the water supply under different requirements for water quality.