CN203530074U - System for recycling wastewater generated by pulping and preparation of bobbin paper by waste paper - Google Patents

Abstract

The utility model provides a system for recycling wastewater generated by pulping and preparation of bobbin paper by waste paper. The system mainly comprises an efficient anaerobic biological treatment device, an aerobic biological treatment device, an ozone-biological active carbon treatment device, and a microfiltration and nanofiltration treatment device which are sequentially connected. The system can effectively remove residual refractory organics such as lignin in wastewater, the COD (chemical oxygen demand) removal rate reaches up to over 98%, the removal rate of Ca<2+> and removal rate of Mg<2+> are also high and respectively reach over 75% and over 85%.

Description

Waste paper pulp-making is manufactured cop tube paper wastewater recycling system

Technical field

The utility model relates to field of environment protection and the Industrial Wastewater Treatment engineering of paper industry, is specifically related to a kind of waste paper pulp-making and manufactures cop tube paper wastewater recycling system.

Background technology

The fast development of China's paper industry, cause the contradiction between itself and resource, environment outstanding day by day, the scarcity of resources, the paper-making effluent that are mainly manifested in plant fiber material and water of productive use are day by day serious to the pollution of environment, become two large bottlenecks of its development of restriction.It is main raw material that give up paperboard, disregard message paper, useless book paper, other paper product waste material and commercial pulp (mostly being bleaching wood pulp) generally take in the papermaking of waste paper class, the products such as production white board, boxboard, fluting board.According to estimates, in 2005, China's waste paper utilization rate reached 40%, and waste paper dosage surpasses 2,000 ten thousand tons, and now, China's paper waste consumption has accounted for 52% of paper making pulps total amount.Waste paper is recycled and to be not only conducive to alleviate shortage of resources, protection of the environment, returns enterprise and brings to save and invest, reduce costs, reduce pollution, improve the economic benefit of the each side such as quality.

Paper industry is water rich and influential family You Shi water heavy polluter, and water saving and the anti-pollution of harnessing the river are far-reaching research topics.The processing of current domestic papermaking (waste paper class) waste water is conceived to part recycle more and makes to process the discharge of water water quality reaching standard upper, and result is that the wastewater discharge and the processing water Effects of Water Quality that reduce are unsatisfactory.In recent years, the closed circulation of paper waste and zero-discharge technology become the important directions of paper waste Processing Technology Research.The pulping and paper-making that the waste paper of abroad take is raw material has much been realized zero release, and China is also making important progress aspect the research and practice of Paper-making Waste Paper And zero-discharge technology.

Waste paper making wastewater zero release can make a ton consumption for paper fresh water drop to 1.5m ³, reduce fresh water processing costs, can avoid discharge of wastewater and cost for wastewater treatment simultaneously, need not pay effluent charge to environmental administration, because fresh water consumption reduces, plain boiled water temperature be improved, thereby improve wet end drainability, improve the mass dryness fraction after squeezing, reduce energy consumption for drying.Yet, adopt the certain risk of totally-enclosed existence, be mainly that the burn into of system produces scent of compound, increase rotten slurry and produce, reduce retention, produce precipitation, cause operation troubles, reduce quality product etc.

Realize zero release and also have some shortcomings, such as smell problem, because plain boiled water can acidifying anaerobism occur in circulation, produce hydrogen sulfide simultaneously.The concentration of pollutent improves, as the problems such as disconnected paper can appear to paper machine operation in gluing thing, anionic trash etc.Because COD concentration is high, easily the wet end at paper machine generates microbial film.The accumulation meeting of high-temperature and chlorion produces stronger corrosion to paper machine.For some paper product, such as Case Board, can the raise concentration of calcium ion of the sealing of water loop, easily causes the fouling of whole water system.

For solving degradation problem under system burn into smell that regenerated papermaking zero release occurs and quality product, need to provide a kind of efficient, clean waste paper making wastewater to recycle technique and device.

Summary of the invention

For solving degradation problem under system burn into smell that regenerated papermaking zero release occurs and quality product, need to provide a kind of efficient, clean waste paper making wastewater to recycle technique and device.

For realizing the purpose of this utility model, the utility model provides a kind of waste paper pulp-making to manufacture cop tube paper wastewater recycling system, mainly comprises successively connected efficient anaerobe treatment unit, aerobe treatment unit, ozone---biological activated carbon treatment unit, micro-filtration and nanofiltration treatment unit.

Foregoing waste paper pulp-making is manufactured cop tube paper wastewater recycling system, and preferred scheme is that described efficient anaerobe treatment unit forms by being hydrolyzed pre-acidification pool and high efficiency anaerobic reactor.

Foregoing waste paper pulp-making is manufactured cop tube paper wastewater recycling system, and preferred scheme is that described aerobe treatment unit is comprised of aeration tank and second pond.

Foregoing waste paper pulp-making is manufactured cop tube paper wastewater recycling system, and preferred scheme is that described ozone---biological activated carbon treatment unit is comprised of ozone contact tower and biological activated carbon filter.

Foregoing waste paper pulp-making is manufactured cop tube paper wastewater recycling system, and preferably scheme is, described ozone contact tower is cylinder tower, and its aspect ratio is 6～8.

Foregoing waste paper pulp-making is manufactured cop tube paper wastewater recycling system, and preferably scheme is, in described biological activated carbon filter, the loading height of gac is 1.5～2m, and packing density is 480～500g/L.

Advantage of the present utility model and positively effect are embodied in:

A. a kind of waste paper pulp-making that the utility model provides is manufactured cop tube paper waste water reclamation and is utilized technique, and its technical process is simple, convenient operation and management.

B. the waste water reclamation that the utility model provides utilizes technique, and stable effluent quality effectively solves the problems such as system burn into smell that paper making wastewater zero discharge occurs.Meanwhile, this technique has realized the recycle of waste water, has saved great lot of water resources.

C. ozone---BAC process is processed the waste water after biochemical treatment in the utility model employing, ozone has strong oxidizing property, difficult degradation larger molecular organics residual in waste water can be decomposed into can be biochemical small organic molecule, also there is germicidal action simultaneously, alleviate the pollution of bacterium to subsequent film separating unit in waste water.

D. the utility model adopts the pretreatment technology that microfiltration systems is processed as nanofiltration, can remove the macromolecular substance in waste water, guarantees the requirement of nanofiltration to influent quality, and protection nanofiltration membrane component, improves separation efficiency.

E. the utility model adopts nanofiltration system, can effectively remove the hardly degraded organic substances such as lignin residual in waste water, and COD clearance is up to more than 98%, to Ca ²⁺, Mg ²⁺clearance is also very high, is greater than respectively 75% and 85%.

F. adopting micro-filtration---nanofiltration membrane separation system, working pressure is low, low to system dynamic requirement, thereby reduces the investment cost of whole plant.Can realize automatization and control, reliable, floor space is little.Only the impellent as membrane sepn with pressure, therefore installs simply, and easily maintenance, simple to operate, water conditioning.Reduce the use of chemical agent simultaneously, reduce secondary pollution.Separation efficiency is high, and water quality is good.

Accompanying drawing explanation

Fig. 1 is the device connection diagram that a kind of waste paper pulp-making that the utility model provides is manufactured cop tube paper wastewater recycling system.

Embodiment

Below in conjunction with Fig. 1 and embodiment, the utility model is described further.

1 one kinds of waste paper pulp-makings of embodiment are manufactured cop tube paper wastewater recycling system, mainly comprise successively connected efficient anaerobe treatment unit, aerobe treatment unit, ozone---biological activated carbon treatment unit, micro-filtration and nanofiltration treatment unit.Described efficient anaerobe treatment unit forms by being hydrolyzed pre-acidification pool and high efficiency anaerobic reactor.Described aerobe treatment unit is comprised of aeration tank and second pond.Described ozone---biological activated carbon treatment unit is comprised of ozone contact tower and biological activated carbon filter.Described ozone contact tower is cylinder tower, and its aspect ratio is 6～8.In described biological activated carbon filter, the loading height of gac is 1.5～2m, and packing density is 480～500g/L.

A kind of waste paper pulp-making that the utility model provides is manufactured cop tube paper waste water reclamation and is utilized technique, comprises as follows step in sequence:

1, efficient anaerobe is processed: waste water passes through the pre-treatment structures such as grid pump well, oblique net, settling tank and equalizing tank first in turn, remove the larger suspended substance that floats in waste water, reclaim longer fiber, and after the regulating water quality water yield, enter efficient anaerobe treatment system.Described efficient anaerobic system forms by being hydrolyzed pre-acidification pool and high efficiency anaerobic reactor.Waste water is first through being hydrolyzed pre-acidification, utilize hydrolysis anaerobion, the larger molecular organics of difficult degradation in water is decomposed into the small organic molecule of easy degraded, realize the chain rupture of broken ring, remove a part of organic pollutant, alleviate subsequent biological treatment difficulty, water outlet is carried out anaerobically fermenting through anaerobism feed tank with pump input high efficiency anaerobic reactor, by the biological action of anaerobic granular sludge bed, the most of hardly degraded organic substance in waste water is decomposed and produced CH ₄bioenergy.

In described grid pump well, interval of grid strip is 15～25mm, and tiltedly net is 100～150 orders.

The hydraulic detention time of the pre-acidification pool of described hydrolysis is 6-8h, dissolved oxygen concentration≤0.5mg/L.

2, aerobe is processed: anaerobic effluent enters aerobic treatment system, and absorption, oxidation, Degradation by means of aerobic microbiological in aeration tank are removed majority of organic pollutants in water.Aeration tank water outlet is from flowing into second pond, the suspended substance in Separation of Water.

Described aerobic treatment system is comprised of aeration tank and second pond.Described aeration tank dissolved oxygen concentration is 2～4mg/L, and sludge loading is 0.2～0.4kgBOD/ (kgd).Described second pond hydraulic detention time is 1.5～4h, and hydraulic surface loading is 0.6～1.5m ³/ (m ²h).

3, ozone---biological activated carbon is processed: second pond water outlet enters ozone---biological activated carbon system.Utilize the oxidation capacity of ozone by the long-chains such as the colloid of difficult for biological degradation remaining in waste water and xylogen, larger molecular organics degraded, be translated into less and degradable organism.Self there is the characteristic that hole is many, specific surface area is large, the dissolved organic matter in planar water rapidly, also can enrichment water in a large amount of microorganisms.The dissolved organic matter that is attracted to activated carbon surface provides nutrition source for microorganism, and in carbon bed, the aerobic bacteria of raised growth breeding and the adsorptive power of gac come water outlet to remove suspended substance through flocculation sedimentation tank simultaneously.

Described ozone---biological activated carbon system is comprised of ozone contact tower and biological activated carbon filter.Described ozone contact tower is cylinder tower, and its aspect ratio is 6～8, and ozone contact time is 5～10min, and ozone dosage is 0.5～1mg/L.In described biological activated carbon filter, the loading height of gac is 1.5～2m, and packing density is 480～500g/L, and the filtering velocity in filter tank is 8～10m/h, and be 10～15min duration of contact.The gac adopting is the granular carbon that Shanghai Xin Hui gac company limited produces, and particle diameter is 8～30 orders, specific surface area>=1000m ²/ g, intensity>=95%, iodine number>=1000mg/g.

4, micro-filtration: through ozone---the waste water that biological activated carbon is processed enters microfiltration membrane equipment, by the effect of microfiltration membrane, particle, bacterium, the colloid of 0.1～10 μ m size is sieved, is filtered, and makes it separated with waste water.

Described microfiltration membrane equipment is that Jiangsu Kaimi Membrane Technology Co., Ltd. produces, and the membrane module adopting is the membrane element that U.S. GE company produces, and micro-filtration diaphragm model is JX, and filtering accuracy is 0.3um.

5, nanofiltration: micro-filtration water outlet enters nano-filtration membrane equipment, the effect by nanofiltration membrane by the organic macromolecule of difficult degradation residual in waste water and divalence or polyvalent ion as Ca ²⁺, Mg ²⁺ions etc., recycle in paper in the source after processing.

Described nano-filtration membrane equipment is that Hangzhou Saite membrane technique company limited produces, and the membrane module adopting is the membrane element that U.S. GE company produces, and nanofiltration diaphragm model is DK, working pressure 0.6～1MPa, and filtering accuracy is 0.001～0.1um.

Utilize said system to process the experimental result that certain paper plant's waste paper pulp-making is manufactured cop tube paper waste water.

Experimental result is as shown in the table:

As can be seen from the above table: with after art breading wastepaper pulping and papermaking cop tube paper waste water of the present invention, pollutant removal highly significant, COD clearance is up to 99.1%, desalination rate is up to 95～98%, turbidity removal rate is 100%, and final outflow water water quality is very good, has reached the requirement of reuse water standard.

Claims (6)

1. waste paper pulp-making is manufactured cop tube paper wastewater recycling system, it is characterized in that, mainly comprises successively connected efficient anaerobe treatment unit, aerobe treatment unit, ozone---biological activated carbon treatment unit, micro-filtration and nanofiltration treatment unit.

2. waste paper pulp-making according to claim 1 is manufactured cop tube paper wastewater recycling system, it is characterized in that, described efficient anaerobe treatment unit forms by being hydrolyzed pre-acidification pool and high efficiency anaerobic reactor.

3. waste paper pulp-making according to claim 1 is manufactured cop tube paper wastewater recycling system, it is characterized in that, described aerobe treatment unit is comprised of aeration tank and second pond.

4. waste paper pulp-making according to claim 1 is manufactured cop tube paper wastewater recycling system, it is characterized in that described ozone---and biological activated carbon treatment unit is comprised of ozone contact tower and biological activated carbon filter.

5. waste paper pulp-making according to claim 4 is manufactured cop tube paper wastewater recycling system, it is characterized in that, described ozone contact tower is cylinder tower, and its aspect ratio is 6～8.

6. waste paper pulp-making according to claim 4 is manufactured cop tube paper wastewater recycling system, it is characterized in that, in described biological activated carbon filter, the loading height of gac is 1.5～2m, and packing density is 480～500g/L.

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