Method for recycling wastewater from papermaking without discharging

A technology of zero discharge and water circulation, applied in the field of papermaking technology, can solve serious pollution and other problems, achieve the effects of saving operating costs, high aeration efficiency, and saving infrastructure costs

Inactive Publication Date: 2013-04-17
ZUNYI ZUNHUA PAPER IND
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Problems solved by technology

[0003] The purpose of the present invention is to provide a zero-discharge method for papermaking production water recycling and recycling in order to overcome the serious p

Method used

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Embodiment Construction

[0009] The present invention is described in detail below with specific embodiment:

[0010] The zero-discharge method for recycling papermaking production water according to the present invention includes pretreatment and physical, chemical and biochemical treatment, wherein the purpose of the pretreatment is to recycle fibers in papermaking wastewater and reduce the load on the biochemical system. The pretreatment method is to use the filtration method to recycle the pulp in the wastewater. The recycling equipment includes inclined screens with 80-100 meshes and ordinary rotary filters to remove the fibers in the wastewater and ensure the recovery of pulp and the quality of the effluent. The removal rate of suspended solids and large particles by the inclined screen can reach more than 90%, which reduces the load of subsequent processes, recycles fibers for reuse in production, and the remaining wastewater passes through the collection well for a short period of time, an...

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Abstract

The invention relates to a method for recycling the wastewater from papermaking without discharging, comprising the following steps of: (a) pretreating the wastewater from papermaking: recovering the paper pulp in the wastewater by filtering, removing the fiber in the wastewater to guarantee the paper-pulp recovering amount and the effluent quality and reduce the load of the subsequent process, recycling the recovered fiber for production, feeding the left fiber into a physical, chemical and biochemical system, and treating physically, chemically and biochemically; and (b) discharging the wastewater into an aerating pond, treating further, discharging the biochemical sludge and the wastewater into a settling pond, settling in the settling pond, feeding the wastewater into a stabilizing pond, sterilizing by static electricity for recycling, making one part of the settled sludge reflow into the aerating pond, feeding the other part of sludge into a sludge storing pond, settling in the sludge storing pond, returning a supernatant into the aerating pond, storing the sludge for a long time, and transporting outwards to serve as the farmyard manure. The method has the advantages that the capital expense and the operation expense can be saved, the pollutant in the wastewater can be removed, the least energy is consumed, the wastewater from papermaking can be recycled without being discharged, and the enterprises can gain high economic benefit with low investment.

Description

technical field [0001] The invention relates to a zero-emission method for recycling water used in papermaking production, and belongs to the technical field of papermaking technology. Background technique [0002] my country is a country that is very short of water resources, and the per capita possession of water resources is only 2100M 3 , about 1 / 4 of the world's per capita water resources, and the traditional paper industry is an industry that consumes a lot of water resources. The average water consumption per ton of pulp and paper is more than five times the international advanced level. In addition, the papermaking sewage A large amount of discharge will cause serious environmental pollution. According to the statistics of environmental protection in 2000, the total wastewater discharge of 4119 papermaking and paper products enterprises at or above the county level was 3.53 billion tons, accounting for 18.2% of the total industrial discharge in the country, of which...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 陈鸿
Owner ZUNYI ZUNHUA PAPER IND
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