Method for recovering sewage of artificial board production system

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: 2014-03-19
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

Method used

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  • Method for recovering sewage of artificial board production system
  • Method for recovering sewage of artificial board production system

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0022] Embodiment 1: refer to the attached figure 1 , the vacuum concentration heating tank of the present invention operates alone, and is applied to a daily output of 500 m 3 MDF production system with chip washing device.

[0023] The daily discharge of sewage from the wood chip washing process is 50m 3 , the daily sewage discharge volume of the cork screw is 30m 3 , other sewage volume is about 10m per day 3 , a total of about 90m 3 / day, the average sewage volume per hour is 3.75m 3 , the air volume of the drying fan is about 300000m 3 / h, separate air preheater on the air inlet side of the dry air heater.

[0024] In this embodiment, the vacuum concentration heating tank adopts the flue gas of the biomass heat-conducting oil furnace of the wood-based panel production system as the heat source, the temperature of the flue gas is 150-180 ℃, the temperature of the vacuum concentration heating tank is controlled to be 70-75 ℃, and the pressure is 1.5 -2.0KPa, the temp...

Example Embodiment

[0025] Embodiment 2: refer to the attached figure 2 , the vacuum concentration heating tank of the present invention is connected to the water washing system, and is applied to a daily output of 500 m 3 MDF production system with chip washing device.

[0026] The amount of circulating water in the wood chip washing process is 250-300m 3 / h, the daily sewage discharge volume of the 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 300000m 3 / h, separate air preheater on the air inlet side of the dry air heater.

[0027]Using solid caustic soda to adjust the pH value of circulating water to 8.5-9.0, the vacuum concentration heating tank of sewage uses the flue gas of the biomass heat-conducting oil furnace of the wood-based panel production system as the heat source, and the temperature of the flue gas is 150-180 ℃, and the vacuum concentration heating tank is controll...

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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 treating sewage in a wood-based panel production system, and belongs to the technical fields of energy saving, environmental protection and comprehensive utilization of wood-based panel production. Background technique [0002] The sewage generated in the production process of wood-based panels is mainly wood chips and other raw materials washing and drainage, cork screw extrusion water, wood chip cooking wastewater, ground washing water, etc.; the sewage contains a large amount of suspended matter such as mud, bark, wood chips, fibers, etc. , wood powder, etc., and also contains some plant fiber extracts such as cellulose, lignin, resinous compounds, etc.; resinous compounds include resinous acids, long-chain fatty acids, tannin compounds, etc. This kind of wastewater has the characteristics of high concentration of organic matter and suspended matter, and is a kind of high-concentration organic wast...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 景玉国
Owner WENAN COUNTY TIANHUA DENSITY BOARD
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