CN1148571A

CN1148571A - Method for treating waste industrial water from light industry by using burning boiler

Info

Publication number: CN1148571A
Application number: CN 96109940
Authority: CN
Inventors: 黄敏; 麦永强; 韦日繁; 马超伟
Original assignee: Zhengyu High-New Tech Co Ltd Nanning
Current assignee: Zhengyu High-New Tech Co Ltd Nanning
Priority date: 1996-07-20
Filing date: 1996-07-20
Publication date: 1997-04-30
Anticipated expiration: 2016-07-20
Also published as: CN1064933C

Abstract

The present invention provides a method for treating sewage produced from light industry by using combustion boiler. Its steps are as follows: firstly, the sewage produced in the course of production in paper mill, alcohol plant, starch mill and food products factory, etc. is fed into a solid-liquid separation equipment to remove or recover solids partially, then fed into boiler to be used as water for dust-removing, sluicing and dredgs-flushing, then fed into an ash-water separator to separate ash from clear wwater, then the clear water is pumped into a clear water basin and fed into boiler for recirculating use, and its sediment can be used as solid organic fertilizer and raw material for baking bricks and calcining cement.

Description

Utilize burning boiler to handle the method for waste industrial water from light industry

The present invention relates to the treatment process of the sewage of factories' discharges such as a kind of treatment process of waste industrial water from light industry, particularly paper mill, grain distillery, sugar refinery, starch factory, Gourmet Powder Factory, food factory.

Can produce a large amount of industrial sewages in the process of factory production such as existing paper mill, grain distillery, sugar refinery, starch factory, Gourmet Powder Factory, food factory, these sewage are let alone free discharging meeting serious environment pollution, when particularly being discharged to rivers and lakes, can greatly have influence on people's production and life.In order to alleviate environmental pollution, the processing to these waste industrial water from light industry at present has following several method: 1, add chemical reagent and handle; 2, concentration and evaporation; 3, biological process or oxidation pond are handled; 4, add auxiliary material and produce byproduct.This several method exists respectively and invests greatly, occupation of land is many, working cost is high and handle shortcomings such as not thorough, make enterprise be difficult to bear, so many places are for the basic problem of environmental pollution that solves, plant shutdowns that have to waste water control is bad has caused very big financial loss and has increased the unemployed people.

The purpose of this invention is to provide that a kind of method is simple, reduced investment, occupation of land less, effective industrial sewage process method.

The technical scheme that the present invention solves is that industrial sewage is realized as the non-steam water of burning boiler.Burning boiler mainly is the stove that burns coal or vegetation, preferably fluidizing furnace.Concrete grammar is earlier industrial sewage to be delivered in the solid-liquid separating equipment, solid substance in the sewage is removed, little for particle, difficult settled material such as black liquid, plain boiled water etc., can add flocculation agent earlier, just enter solid-liquid separating equipment then, the sewage that comes out from solid-liquid separating equipment top with pump delivery to burning boiler as dedusting, dash ash, the flushing cinder water, again these water are arrived the pulp water separating device with pump delivery after coming out, the coal ash that will contain impurity, cinder is separated as organic fertilizer or is baked bricks, the heat up water raw material of mud, and clear water directly enters clean water basin, squeezes into boiler again and dashes ash, flushing cinder and dedusting are used.

The principle of sewage disposal of the present invention is: contain the very micropore of bigger serface in cinder and the ashes particle, when sewage contacts with it, because physical adsorption and chemisorption, suspended substance in a large amount of adsorbent solutions of micropore energy, colloid and various organic substance and inorganic substance, as the fiber in the black liquid, particulate in the starch wastewater, the mycelian protein of alcohol slops, the nitrate of some sewage, nitrite, sulfide, vitriol, amine, materials such as benzene, the slag that has particularly just burnt, dust in ashes and the flue, has very strong adsorptive power, very fast decolouring after various industrial sewages are contacted with it, layering, and can recycle for a long time, no longer be discharged in the environment.In the bigger factory of sewage quantity, when sewage fed the wet scrubber of various boiler flues, hot flue gases and hot ashes can also evaporation section moisture content, and quantity discharged is significantly reduced.And the coal ash that has adsorbed large amount of organic matter can increase fertilizer efficiency and improve calorific value, further comprehensive utilization.

Two kinds of the solid-liquid separating equipments that the present invention adopts, a kind of is to intercept cyclone separator, its structure top is divided into cylinder, the bottom is a cone, be welded with block plate of some circles on the cylinder inwall on top as barrier, make speed faster solution tangentially enter behind the barrel and the barrier collision, the solid substance conglomerate is discharged in separator bottom sedimentation and by the solid substance outlet pipe, and clear liquid overflows in the clean water basin on the upper strata.Another kind of solid-liquid separator adopts the intermittent type separator, its structure top is cylinder, intermittent drainage container and clear water overflow port are housed in the cylindrical shell, the bottom is a cone, and water screw and solid substance outlet pipe at a slow speed be housed, its principle of work is that sewage enters the intermittent drainage container, water escape valve is housed on the container, after filling, water promptly releases downwards by spray tube, particle is subjected to fierce collision conglomerate and is deposited to the bottom when releasing, flow out from the outlet pipe of cone and to reclaim, the clear water of overflow flows to and is transported to boiler behind the clean water basin again as dedusting, flushing cinder with dash ash and use.Slow stirrer designs in order to prevent rotten change of solid substance.

Solid-liquid separating equipment can also use dress spray tube, eddy flow plate or other structure formation in the cylindrical shell.

The pulp water separating device is that boiler flue fly-ash separator outlet and flushing cinder are isolated the equipment of lime-ash and water towards buck, and internal structure is identical with above-mentioned said obstruct cyclone separator.

Below in conjunction with Figure of description industrial sewage process method of the present invention and equipment are described:

Fig. 1 is the process flow sheet that industrial sewage of the present invention is handled;

Fig. 2 is the structural representation that intercepts eddy flow solid-liquid separating equipment and pulp water separating device;

Fig. 3 is the structural representation of intermittent type solid-liquid separating equipment.

From Fig. 1, see, industrial sewage is introduced into solid-liquid separating equipment solid content reclaimed, the clear liquid of overflow is defeated with pump Deliver to boiler as dedusting, punching ash, flushing cinder water, the sewage that will be entrained with again lime-ash separates with the slag water separation equipment Go out lime-ash, clean water overflow is returned boiler with pump then and is reused to the clear water pond, if boiler capacity is big, and dirt Water is inadequate, can replenish clear water in the clear water pond, and the slag of discharging from slag separator bottom enters detritus tank, detritus tank Inferior clear water also can lead to into the clear water pond and recycle, slag can be made fertilizer after drying, the raw material of brickmaking and cement.

See among Fig. 2 that industrial sewage enters in the separator top cylindrical shell 2 from inlet tube 1, tangent line enters and forms Eddy flow intercepts plate 4 owing to be welded with in the cylindrical shell 2, and solid is collided and is deposited to bottom cone, and from solid Discharge in the thing outlet 6, clear water flows out at the overflow pipe 3 at separator top, and the separator middle part has thin solid content to go out Mouth pipe 5.

Fig. 3 is the intermittent solid-liquid separator, and the difference of it and baffle type rotational flow separation device is sewage induction pipe 7 Enter cylindrical shell 8 interior rear importings earlier in the intermittent drainage container, control valve 9 is arranged in the container, valve drives flashboard 11, Cover earial drainage pipe 12 when flashboard 11 is flat, when the water of container arrives certain liquid level, the valve of motor-driven or electronic control 9 are about to flashboard 11 opens, and the water of container sprays down by the earial drainage pipe, the acceleration sedimentation that is collided of solid particle To the bottom, by the low speed screw oar 13 that motor 15 drives solid content to be discharged from outlet 14, clear water is then Flow to the clear water pond from overflow pipe 10.

The present invention compared with prior art, its substantive distinguishing features and significant progress are:

1, method is simple, does not need very complicated technology also not need special chemicals to process.

2, investment economizes, and takes up an area and lacks, and only needs 2 solid-liquid separating equipments and 2 cement ponds, does not need large tracts of land Bio-aeration pool and oxidation pond.

3, thoroughly solved the sewage discharge difficult problem of full factory, can also solve the non-steam water of boiler, reduced certainly Come water consumption, opened up a new road for factory increases income and decreases expenditure.

4, the fire coal high to some sulfur-bearing, the sewage (as black liquid) that uses band alkalescence can also alleviate the formation of smoke pollution and acid rain as the boiler flue water for dust removal.

5, the filter residue after disposing of sewage is a kind of good organic fertilizer, particularly grain distillery's waste liquid, food factory's waste liquid, neutral ammonium sulfite process black liquor, after ashes contact, filter the dried high-quality fertilizer that is rich in nitrogen phosphorus potassium that is, what have contains combustiblematerials, as baking bricks, and the mud raw material of heating up water, can reduce coal consumption, save cost.

6, the industrial sewage before dashing ash, flushing cinder, dedusting earlier can the recovery part Industrial products through solid-liquid separating equipment, as starch, paper pulp, feedstuff protein etc., annually bring considerable economic for factory.

Below be embodiments of the invention:

Embodiment one, intercept cyclone separator with the legal paper mill black liquor elder generation process of learning slurry of ammonium sulphite, isolated solution is delivered to boiler and is used as dashing ash, dedusting and flushing cinder, lead to the pulp water separator then, the clear water that separator top obtains recycles to boiler with pump delivery after advancing clean water basin, the slag of separating intercepts the solid merging as fertilizer sources use of cyclone separator in detritus pool post precipitation and front, the inferior clear liquid of detritus pool can be returned boiler and recycle.

Embodiment two, the yellow slurry of starch factory feeds the intermittent type separator earlier, cutting out partial starch, recycle, clear liquid is delivered to the foam fly-ash separator of boiler flue outlet and as the flushing cinder water, deliver to clear water after coming out from device, lime-ash is separated, clear water and time clear water recycle again with the pumped back boiler.

Embodiment three, waste liquid behind grain distillery's distilled spirit leads to boiler foam fly-ash separator earlier, to contain cindery waste water then and lead to the pulp water separator, the upper strata clear water is put into time clean water basin, after slag enters detritus pool, can be used as fertilizer or brickmaking materials after shoveling out or filtering, the inferior clear water after the filtration also enters clean water basin, returns boiler with pump and recycles.

Embodiment four, and the waste liquid behind the extraction L-glutamic acid of Gourmet Powder Factory adds the flocculation agent poly amic acid earlier, feeds the intermittent type separator, isolates the albumen mycelia, reclaims and makes feed, press the method for embodiment two then and handle.

Claims

1, a kind of method of utilizing burning boiler to handle waste industrial water from light industry, it is characterized in that the sewage that earlier process of factory production is produced feeds solid-liquid separating equipment, delivering to boiler behind separation and the recovery part solid substance again does dedusting, dashes ash, flushing cinder water, enter the pulp water separating device again, lime-ash flows out from the separating device bottom, and clear water overflows to clean water basin, recycles with the pump delivery back boiler then, the dried back of lime-ash filter is as solid organic fertilizer or bake bricks the raw material of the mud of heating up water.

2, the method of processing waste industrial water from light industry according to claim 1, it is characterized in that solid-liquid separating equipment is to intercept cyclone separator or intermittent type separator, the spray tube separator, eddy flow plate separator, wherein intercepting cyclone separator is made of the cylindrical portions may on top and the cone of bottom, cylindrical portions may has sewage induction pipe (1), clear water overflow port (3) and the baffler (4) that is welded in cylinder inner wall, the bottom cone has solid substance outlet pipe (6), the intermittent type separator also is made of cylindrical shell and cone, shell portion is provided with liquid-inlet pipe (7), clear water overflow port (10) and intermittent drainage container, control valve (9) is housed in the container, flashboard (11) and upflow tube (12), cone are equipped with water screw and drive its electric motor (15) and solid substance outlet pipe (14) at a slow speed.

3, the method for processing waste industrial water from light industry according to claim 1, it is characterized in that the pulp water separating device divides device for intercepting eddy flow, its structure is made of the cylinder and the bottom cone on top, cylinder has sewage induction pipe (1), clear water overflow port (3) and is welded in the interior baffler (4) of cylinder, fine particle solid substance outlet pipe (5), cone are equipped with thick slag outlet pipe (6).