Method for treating wastewater of fibre-board plant
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A technology for wastewater treatment and fiberboard, which is applied in the process of wastewater treatment, biological water/sewage treatment, flotation water/sewage treatment, etc. It can solve the problems of long design residence time, large one-time investment, unbearable for enterprises, etc. The effect of saving tap water consumption, low operating costs, and small equipment footprint
Inactive Publication Date: 2009-11-11
GUANGXI FENGLIN WOOD IND GRP CO LTD
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Abstract
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Problems solved by technology
[0003] At present, the waste water treatment of fiberboard manufacturing enterprises at home and abroad generally adopts a combination of physical and chemical separation and biochemical treatment. There are many procedures, complicated processes, long design residence time, large equipment volume, large land occupation, and large one-time investment, making it unbearable for enterprises.
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Embodiment 1
[0032] After the production wastewater passes through the bow screen filter and centrifuge to remove large particles of wood slag, short fibers, silt and other substances, most of the wastewater is reused for washing wood chips, and the effluent is sent to the advection sedimentation tank, pre-aeration adjustment tank, and iron aeration Pool, air flotation, ABR anaerobic treatment, three-stage contact oxidation tank, inclined tube settler, valveless filter unit process combination.
[0033] Process indicators and descriptions of each unit:
[0034]
[0035]
[0036] The waste water treatment system adopting the above combination process, the depth index of the effluent water quality after treatment meets the first-level discharge standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996), the main water quality index:
[0037] project
[0038] By adopting the above-mentioned combined process technology, the consumption of running water is saved, ...
Embodiment 2
[0040] The production wastewater in this example is partially reused after separation of slag, and the effluent is sent to advection sedimentation, pre-aeration adjustment tank, vertical flow sedimentation, air flotation, ABR anaerobic treatment, three-stage contact oxidation tank, inclined tube settler, valveless filter Pool unit process combination.
[0041] Process indicators of each unit:
[0042]
[0043]
[0044]The waste water treatment system adopting the above combination process, the depth index of the effluent water quality after treatment meets the first-level discharge standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996), the main water quality index:
[0045] project
[0046] By adopting the above-mentioned combined process technology, the consumption of running water is saved, and the production waste water is discharged less. The invention plays a powerful role in promoting the energy saving and emission reduction advocated ...
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Abstract
The invention discloses a method for treating wastewater of a fibre-board plant. The method is characterized by including the combination of technical skills of the following three parts: a pretreatment system, a biochemical treatment system and an aftertreatment system; wastewater from production is respectively led into a filter and a centrifuger; after being processed by the step of slag removal, the wastewater flows into a horizontal sedimentation tank, a pre-aeration regulation tank and an iron aeration tank or a vertical sedimentation tank and then is processed by dissolved air flotation; the discharged water is respectively pumped into a turn-back flow anaerobic tank with filter materials and an oxidation tank and then flows into an inclined-tube sedimentation tank to settle; and after suspended substances in the wastewater are removed by a filtration tank, the wastewater is discharged while reaching standards. The method has the advantages that the efficiency of removing the suspended substances is high, water is circularly and repeatedly used, water consumption is reduced, the discharge amount of the wastewater can be reduced by more than 300 tons each day, the occupation of land of equipment is low, the operation is simple, and the running cost is low. Extruded wood slag and sludge can be used as energy to be led into an energy centre to combust, secondary pollution is not caused, and the treated wastewater can meet the requirement of primary standard in the Integrated Wastewater Discharge Standard GB8978-1996.
Description
technical field [0001] The invention relates to a waste water treatment method of a wood-based panel factory, in particular to a combined method of pretreatment, biochemical treatment and post-treatment system applied to the production waste water treatment of a fiberboard factory. Background technique [0002] In 2008, my country's medium density fiberboard production capacity reached more than 30 million m 3 , ranking first in the world. Among them, the continuous flat pressing production line introduced in recent years has advanced equipment and large investment. Adopting thermal grinding fiber separation technology with water-washed wood chip technology, the equipment wears less, the fiber quality is good, and the products are oriented to the high-end market with high added value. However, washing wood chips produces a large amount of production wastewater, which has the characteristics of high suspended solids content, high COD, deep color, and difficult biochemical d...
Claims
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Application Information
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