CN1423013A

CN1423013A - Secondary fiber papermaking waste water zero-discharge technology

Info

Publication number: CN1423013A
Application number: CN 01130013
Authority: CN
Inventors: 谢浩然; 陈金中
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-04
Filing date: 2001-12-04
Publication date: 2003-06-11

Abstract

The invention is waste liquor treatment zero discharge technology in second fiber paper making, it includes: 1. the waste liquor is eliminated out big inpurity; 2. the washing waterand white water are stored and buffered in collecting pool separately; 3. adds in flocculating agent around the entrance of pump, it pumps the waste water into processing equipment; 4. the sediment is transmitted from the bottom of processing equiopment to the top of concentrating pot, after concentrating, the mud is transmitted to quaking sieve to be purified; 5. the purified mud is largely tiny fiber, they are transmitted into inclined sieve or other concentrating device to be concentrated, then carries them into workshop to work with raw plasm material; 6 the pure water from the top of processing equipment and the top of concentrating pot is transmitted to workshop to be used. So the water and fiber can be used circularly.

Description

Secondary fiber papermaking waste water zero-discharge technology

Technical field

The present invention relates to a kind of paper waste treatment technology, relate in particular to a kind of secondary fiber papermaking waste water zero-discharge technology.

Background technology

The main method of both at home and abroad paper waste being handled is Coagulation Method, biochemical process at present.Equipment with the Coagulation with Treatment paper waste, mainly be inclined-plate clarifying basin or flotation tank, the hybrid reaction of flocculant and waste water, the mixing of flocculate all realize in different structures, this kind equipment not only floor space is big, and low, the weak effect of efficient of hybrid reaction precipitation, be not suitable for treatment S S, BOD ₅, the higher secondary fiber papermaking waste water of CODcr content and the processing of copying paper plain boiled water, and the flocculant that uses mainly is aluminum sulfate, aluminium polychloride etc., thisly contain aluminum ions flocculate, flocculating effect is poor, the cost height, and in the pulp-water that reclaims, the quality of copying paper there is bad influence, the fine fibre that waste can be recycled.Adopting biochemical process to handle pulp-making waste-water and copying paper plain boiled water needs through aerobic aeration pond aeration, in the aeration tank, to add whiterot fungi HG-03 and carry out the aerobic biochemical processing, need adopt the deep layer jet in this process, aeration or table expose to the sun, oxidation ditch aeration etc., all need consume a large amount of power, will carry out secondary settlement through sedimentation basin in addition.This method investment and energy consumption are big, the processing cost height, and precipitum after treatment can only be drained as refuse, has wasted the fine fibre that can recycle.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art, a kind of reduced investment, good, the consumption reduction of flocculating effect are provided,, again flocculate is reclaimed, can make secondary fiber papermaking waste water zero-discharge technology both with wastewater treatment and renovation.

The present invention seeks to realize like this: the waste wash liquor that secondary fiber papermaking waste water zero-discharge technology comprises the steps: 1, will come from slip house, the plain boiled water that machine room comes through graticule mesh, grid, desilting ditch, remove large stretch of impurity such as plastic sheeting or foamed plastics, and foreign material such as sandstone, iron nail; 2, pulp washing water, plain boiled water are stored in pulp washing water, plain boiled water collecting pit and are cushioned; 3, add flocculant near the suction inlet of water pump, utilize water pump that pulp-making waste-water and white water pump are advanced waste water treater, in waste water treater, pulp-making waste-water and plain boiled water fully mix, react, filter and clarify with flocculant; 4, the precipitum after waste water treater is handled utilizes pressure differential, delivers to the top of mud concentration tank from the bottom of waste water treater, and after concentrating, mud is delivered to the well sifted processing of shaking from the bottom of sludge tank; 5, the mud after purifying, major part is a fiber fines, delivers to slanted screen or other concentrators and concentrates, and send the collocation of slip house and former slurry to use then; 6, from the waste water treater top, and the mud concentration tank top clear water of discharging, utilize high potential difference to send the workshop making beating back to or copy the paper water.

The waste water that comes from the workshop, after Waste Water Treatment is handled, flocculate is separated, the clear water of discharging can carriage return intercropping making beating water or is copied the paper water, situation according to water and fiber balance, can be partly or entirely copying the water that paper plain boiled water is used to pull an oar or regulates pulp density, the wastewater flow rate of Chu Liing can reduce like this.Because copying paper plain boiled water has aluminum sulfate, aluminum sulfate is a kind of flocculant, no matter directly enter Waste Water Treatment, or, all help the flocculating setting of suspended matter, and flocculant of the present invention is an anionic polyacrylamide through the laggard Waste Water Treatment of going into of pulling an oar, this material that has in the recycle-water, to help paper-making process retention, help filter, the dispersion of paper pulp, and the ring crush intensity, bursting strength and the folding strength that improve paper.

The present invention has realized the zero-emission of paper waste owing to adopted technique scheme, and the reuse of fine fibre, thereby has a following beneficial effect, the one, discharge water SS≤100mg/l after treatment, CODcr≤70mg/L has solved the problem of paper waste serious environment pollution; The 2nd, use fine fibre owing to reclaim, created huge economic benefit; The 3rd, because the recycle paper making water has been saved great amount of water resources; The 4th, reduced investment is invested more than 50% than additive method saving such as air supporting method or biochemical process; The 5th, because this system moves continuously, need not to shut down and repair or clean, management maintenance is very easy; The 6th, operating cost is low, the energy consumption of whole system mainly is the suction water pump of waste water treater, therefore energy consumption is very low, the power consumption of waste water per ton only is 0.06 kilowatt hour, the consumption of flocculant has only the 1-7PPM anionic polyacrylamide, about 0.02-0.09 unit, its operating cost only is the 1/3-1/4 of other conventional methods; Key equipment is a waste water treater, its compact conformation, and collection mixing, reaction, filtration, clarification are one, thereby have significantly reduced floor space.

Description of drawings

Fig. 1 is the process chart of wastewater treatment of the present invention.

The specific embodiment

Below in conjunction with drawings and Examples, further set forth technical scheme of the present invention.

Secondary fiber papermaking waste water zero-discharge technology comprises the following steps: 1, with the pulp washing water that comes from slip house, plain boiled water that machine room comes through graticule mesh, grid, desilting ditch, remove large stretch of impurity such as plastic sheeting or foamed plastics, and foreign material such as sandstone, iron nail; 2, pulp washing water, plain boiled water are stored in pulp washing water, plain boiled water collecting pit and are cushioned; 3, near the suction inlet of water pump, add the anionic polyacrylamide flocculant, utilize water pump that pulp-making waste-water and white water pump are advanced waste water treater; 4, the precipitum after waste water treater is handled utilizes pressure differential, delivers to the napex of mud concentration tank from the bottom of waste water treater, and after concentrating, mud is delivered to the well sifted processing of shaking from the bottom of sludge tank; 5, the mud after purifying, major part is a fiber fines, delivers to slanted screen or other concentrators and concentrates, and send the collocation of slip house and former slurry to use then; 6, from the waste water treater top, and the mud concentration tank top clear water of discharging, utilize high potential difference to send the workshop making beating back to or copy the paper water.

Example 1

A boxboard paper plant that produces 2.5 ten thousand tons per year, raw material is the waste carton of purchase, the leftover pieces that the carton factory cutting is remaining etc., use common garden net paper machine to copy paper, slanted screen or garden net thickener etc. are made washing device, and rosin milk is made sizing agent, making beating every day, pulp washing waste discharge 8000m ³, plain boiled water 5000m ³, making beating, waste wash liquor SS1.3～2g/l, CODcr300～500mg/l.The plain boiled water that machine room is discharged, through the catch-basin desanding, flow to the plain boiled water collecting pit, make making beating and pulp washing thinned water with the pumped back workshop, the waste water that making beating, pulp washing are discharged outside the catch-basin desanding, remove impurity such as film, foamed plastics through grid, slanted screen after, flow into the wastewater collection pond and add II type or the III type anionic polyacrylamide of 1.3～1.7PPM with the plain boiled water of remainder, its molecular weight is 750～1,150 ten thousand units, with being pumped to apparatus for treating sewage.After apparatus for treating sewage is handled, suspended matter is separated from water and is settled down to the bottom, clear water is discharged from the top of processor, the suspended matter major part of discharging from the bottom is a fiber fines, utilize pressure differential, send the top of mud concentration tank to by pipeline valve, after further clarification separates, suspended matter is delivered to the sieve that shakes from the bottom of sludge tank with pipeline, relatively large foreign material are removed, again after slanted screen concentrates, sent back to the use of arranging in pairs or groups by a certain percentage of slip house and magma, handle again in return of waste water to the wastewater collection pond that slanted screen is discharged, and the clear water one that discharge at clear water of discharging from the sludge tank top and waste water treater top is reinstated pipeline and sent the workshop use back to.

Example 2

For the paper plant of commodity in use slurry, making beating, pulp washing water and plain boiled water arrive collecting tank again through the catch-basin sand setting and store, and by water pump water are sent into waste water treater and handle, and at the inlet adding II type of pump or the polyacrylamide of III type, addition is 1.5～2PPM.The mud of discharging from the apparatus for treating sewage bottom, the overwhelming majority is fine fibre, filler or sizing agent etc., after the mud concentration tank concentrates, send the workshop back to and use, and from the apparatus for treating sewage top and the mud concentration tank top clear water of discharging send the workshop back to and make making beating pulp washing water.

The fine fibre that reclaims also can be used as the raw material of egg holder.

Claims

1. secondary fiber papermaking waste water zero-discharge technology, this technology comprises the following steps:

(1) the pulp washing water that secondary fiber papermaking waste water is promptly come from slip house, the next plain boiled water of machine room are removed large stretch of impurity, and foreign material;

(2) pulp washing water, plain boiled water are stored in pulp washing water collecting pit, plain boiled water collecting pit respectively and buffering;

(3) add flocculant near the suction inlet of water pump, utilize water pump that pulp washing water and white water pump are advanced waste water treater, pulp washing water and plain boiled water fully mix, react, filter, clarify with flocculant;

(4) precipitum after waste water treater is handled utilizes pressure differential, delivers to the top of mud concentration tank from the bottom of waste water treater, and after concentrating, mud is delivered to the well sifted processing of shaking from the bottom of sludge tank;

(5) mud after purifying, major part is a fiber fines, delivers to slanted screen or other concentrators and concentrates, and send the collocation of slip house and former slurry to use then;

(6) from the waste water treater top, and the mud concentration tank top clear water of discharging, utilize high potential difference to send the workshop making beating back to or copy the paper water.

2. technology according to claim 1 is characterized in that: described flocculant is an anionic polyacrylamide.

3. technology according to claim 1 is characterized in that: the fiber fines of recovery can be made egg holder raw material.