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A method for recycling and treating sewage from a wood-based panel production system
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A production system, recycling technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high treatment cost, rising water in circulating water system, and large investment. , to achieve the effect of high heat utilization rate, low operating cost and low operating cost
Active Publication Date: 2016-01-20
WENAN COUNTY TIANHUA DENSITY BOARD
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Problems solved by technology
The traditional treatment process for this kind of sewage generally adopts pretreatment, anaerobic biochemical treatment, aerobic biochemical treatment and sludge treatment. During the treatment process, more coagulants, flocculants, acids, alkalis and other Auxiliaries, etc.; the main problems are large investment, high treatment cost, complicated operation, unstable external drainage indicators, and easy pollution to the environment; at the same time, organic compounds such as cellulose, lignin, and resins in wastewater have undergone flocculation and precipitation Part of it enters the sludge, and part of it is decomposed into carbon dioxide after biochemical treatment, and the treated water COD, BOD and other indicators meet the standards, but the concentration of salt substances increases significantly and cannot be fully recycled, resulting in water resources and cellulose, wood, etc. waste of organic compound resources such as pigments and resins
[0003] In response to the above problems, someone proposed a zero-discharge process for wood chip washing wastewater, for example: as described in Chinese Patent No. 201110328244.9, the main problem of this process is: when the moisture content of the raw material is low, generally the relative moisture content is ≤50% (weight percentage) When the cork screw squeezes out less water, the wood chip washing and circulating water system can consume this part of the water, which can realize zero discharge of sewage; ), the amount of water extruded by the cork screw is large, and the wood chip washing circulating water system cannot consume this part of the water, causing the circulating water system to swell and be forced to drain, causing environmental pollution
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Embodiment 1
[0022] Example 1: Refer to the attached figure 1 , The vacuum concentration heating tank of the present invention operates independently and is applied to a daily output of 500m 3 Medium density fiberboard production system with wood chip washing device.
[0023] The daily discharge of sewage from the wood chip washing process is 50m 3 , Cork screw daily discharge sewage volume 30m 3 , Other sewage volume is about 10m per day 3 , A total of about 90m 3 / Day, the hourly average sewage volume is 3.75m 3 , The air volume of the drying fan is about 300,000m 3 / h, an air preheater is installed separately on the air inlet side of the dry air heater.
[0024] In this embodiment, the vacuum concentration heating tank uses wood-based panel production system biomass heat conduction oil furnace flue gas as the heat source, the flue gas temperature is 150-180°C, the temperature of the vacuum concentration heating tank is controlled to 70-75°C, and the pressure is 1.5 -2.0KPa, the temperature ri...
Embodiment 2
[0025] Example 2: Refer to the attached figure 2 , The vacuum concentration heating tank of the present invention is connected to the washing system in series, and is applied to a daily output of 500m 3 Medium density fiberboard production system with wood chip washing device.
[0026] Circulating water volume of wood chip washing process 250-300m 3 / h, the daily sewage discharge of cork screw is 30m 3 , Other sewage volume is about 10m per day 3 , The hourly average sewage volume is 3-3.5m 3 , The air volume of the drying fan is about 300,000m 3 / h, an air preheater is installed separately on the air inlet side of the dry air heater.
[0027] Use solid caustic soda to adjust the pH of the circulating water to 8.5-9.0. The vacuum concentration heating tank of sewage uses the flue gas of the wood-based panel production system biomass heat-conducting oil furnace as the heat source, and the flue gas temperature is 150-180℃, and the vacuum concentration heating tank is controlled. The...
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Abstract
The invention relates to a method for recovering sewage of an artificial board production system, belonging to the technical field of energy saving, environmental friendliness and comprehensive utilization for artificial board production. The technical scheme of the invention is as follows: the characteristics that the existing artificial board production system has a water washing process and needs a lot of air to dry wood fibers are utilized, a vacuum concentrating and heating device is additionally arranged, the sewage produced by the artificial board production system is evaporated under the conditions of low temperature and low pressure and is changed into water vapor, the air of the artificial board production system is ingeniously adopted as a cooling medium, the water vapor is cooled as high-added-value condensed water for recycling, and meanwhile, the heat of the water vapor is transferred to the air so as to increase the temperature of the air, thus the energy consumption of a dry air heater is lowered, the heat utilization ratio is high, the operating cost is low, the existing large sewage treatment device can be completely replaced, and the zero discharge of sewage is realized. The method is simple, feasible, energy-saving and environmental-friendly; compared with the background art, the investment is decreased by over 80%, and the operating cost is decreased by over 50%.
Description
Technical field [0001] The invention relates to a method for recycling and processing sewage from a wood-based panel production system, and belongs to the technical field of energy-saving, environmental protection and comprehensive utilization of wood-based panel production. Background technique [0002] The sewage generated during the production of wood-based panels mainly includes raw material washing drainage such as wood chips, cork screw extrusion water, wood chip cooking wastewater, ground washing water, etc.; the sewage contains a large amount of suspended solids such as sand, bark, wood chips, and fibers. , Wood flour, etc., also contain some plant fiber extracts such as cellulose, lignin, resin compounds, etc.; resin compounds include resin acids, long-chain fatty acids, tannin compounds, etc. This kind of wastewater has the characteristics of high concentration of organic matter and suspended matter, which is a high-concentration organic wastewater that is more difficul...
Claims
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Application Information
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