CN102874946B - Synergistic process method for fly ash and percolate - Google Patents

Abstract

The invention relates to a synergistic process method for fly ash. The process method adopts the idea of green chemistry as a reference, and realizes the purpose of treating waste with waste and cyclic utilization of resource. The process method not only has a very good process effect, requires no extra medicine, and realizes the purpose of treating waste with waste; and recycled fly ash processed by percolate can be utilized as cement, paving material, building material, ceramic material and the like.

Description

The cooperative processing method of flying dust-percolate

Technical field

The present invention relates to the cooperative processing method of a kind of cooperative processing method of solid-liquid, particularly flying dust-percolate, belong to field of environment engineering technology.

Background technology

Percolated liquid in city refuse landfill is a kind of high concentrated organic wastewater of complicated component, and the treatment process of percolate has physico-chemical processes and biological process.And the processing method of disposal of incineration of refuse flyash be take in research both at home and abroad at present, solidify stabilization method as main, comprise cement and bituminization, melting and solidification, chemical agent solidification and stabilization.Percolate does not often reach emission standard after biochemical treatment, also needs advanced treatment.In the treatment process of flying dust waste in various degree resource, increased the cost of processing.Therefore, expect flying dust and percolate associated treatment, the saving of resource and cost when wishing to reach the organic removal of part in percolate and processing flying dust, so just for processing percolate and flying dust a kind of collaborative resource utilization road is newly provided.

Summary of the invention

In the flying dust that the object of the invention is to produce for burning city domestic garbage, be rich in great amount of soluble heavy metal and salt, contain in addition organic pollution materials, the Hazardous wastes that belongs to national Specification, must carry out safe disposal, a kind of cooperative processing method of flying dust-percolate is provided, by wet pretreatment, flying dust is carried out to removing of solvend and heavy metal stabilization, using pre-treatment flying dust as the raw material of preparing eco-cement etc., realize the target of flying dust high added value recycling.

For achieving the above object, design of the present invention is:

Landfill Leachate Pollution species is various, and the water outlet after biological treatment is difficult to further biological degradation, and the percolate after processing still has very strong eco-toxicity.Therefore, the advanced treatment that material-city garbage burning flying ash low-cost, efficient, can reuse is applied to percolate is desirable solution, realizes the recycling of flying dust when meeting percolate advanced treatment.

According to foregoing invention design, the present invention adopts following technical proposals:

A cooperative processing method for flying dust-percolate, is characterized in that using for reference the theory of Green Chemistry, realizes the method for the treatment of wastes with processes of wastes against one another, resource circulation utilization.

Concrete operation step is as follows:

(1) by 105 ± 5 ℃ of oven dry of flying dust, by 4～100:1 liquid-solid ratio, be added in percolate;

(2) solid-liquid centrifugation after stirring reaction 24 ± 0.5h;

(3) by solid in previous step in 105 ± 5 ℃ of oven dry, the mass loss before and after flying dust is 15%～35%, the flying dust after oven dry burns in retort furnace, removes the organic substance being adsorbed;

(4) in stirring reaction, part organic substance in percolate, wherein part be soil ulmin, with metallic ions Ca, Cu, Pb, Mg, Ni, Al, Cr, Zn, Mn, Fe and Hg, Cd plasma formation complex compound or inner complex, and sedimentation or be adsorbed in solid phase;

(5) in the situation that of liquid-solid ratio 4～100:1, the clearance of reacted Organic Pollutants of Landfill Leachate is 15%～90%, and colourity is down to tens even lower from hundreds of;

(6) in flying dust metal ion leaching yield more than 30%;

(7) percolate through the blend fiber film of 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron and polysulfone membrane filter, after ultrafiltration, the separated removal of organism of different molecular weight;

(8) metal-organic complex ions exchange, molecular-weight gradation, chromatographic analysis, fluorescence-parallel factor analysis method are measured and are characterized.

A part of organism in percolate, some hazardous and noxious substances such as complex compound of metal-organic are adsorbed, are transferred in flying dust by selectivity, and the color of percolate can shoal and even disappear simultaneously.Percolate COD clearance is 15%～90%.

Salt, the heavy metal ion of the muriate in flying dust and other and other metallic cation is dissolved leaches in percolate.

The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and significantly technical progress:

The cooperative processing method of flying dust-percolate of the present invention, in the situation that other experimental drug additionally not adding can reach the advanced treatment of percolate and flying dust as the utilization of eco-cement, pavior, material of construction, stupalith etc.

Treatment effect table:

In 1L percolate, add flying dust amount g	The clearance of COD (%) in percolate
		10	15～30
20	25～45
		50	55～70
100	60～80
		125	65～85
150	70～90
		200	>75
250	>75

The toxicity of flying dust Cu, Ni, Cr, Mn, Al after percolate is processed leaches and generally can reach Hazardous wastes judging standard, and Zn, Pb, Cd likely can exceed standard.Present method not only reaches good treatment effect, and does not need additional medicine, and has realized the treatment of wastes with processes of wastes against one another, and the flying dust after recycling can be used as the utilizations such as cement, pavior, material of construction, stupalith.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that humic-acid kind organism reacts with metal ion, and Fig. 2 is handling procedure block diagram.

Embodiment

Embodiment mono-:

The cooperative processing method of this flying dust-percolate, percolate mixes according to following liquid-solid ratio with flying dust, through stirring, standing, filter, ultrafiltration, ion-exchange step is processed, and treatment condition are as follows:

Liquid-solid ratio is between 4～100:1; stir 12～24h; standing 10～60 minutes; at centrifuge speed, be under 1000～3000 revs/min; centrifugal 5 minutes; percolate blend fiber film and polysulfone membrane through 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron in ultrafiltration cup filtered, ultrafiltration, and nitrogen is protector, pressure range 0.05-0.30MPa.

Embodiment bis-:

The present embodiment and embodiment mono-are basic identical, and special feature is that concrete operation step is:

(1) by 105 ± 5 ℃ of oven dry of flying dust, by 4～100:1 liquid-solid ratio, be added in percolate;

(2) solid-liquid centrifugation after stirring reaction 24 ± 0.5h;

(3) by solid in previous step in 105 ± 5 ℃ of oven dry, the mass loss before and after flying dust is at 15%-35%, the flying dust after oven dry burns in retort furnace, removes the organic substance being adsorbed;

(4) in stirring reaction, part organic substance in percolate, wherein part be soil ulmin, with metallic ions Ca, Cu, Pb, Mg, Ni, Al, Cr, Zn, Mn, Fe and Hg, Cd plasma formation complex compound or inner complex, and sedimentation or be adsorbed in solid phase;

(5) in the situation that of liquid-solid ratio 4～100:1, the clearance of reacted Organic Pollutants of Landfill Leachate is 15%～90%, and colourity is down to tens even lower from hundreds of;

(6) in flying dust metal ion leaching yield more than 30%;

(7) percolate through the blend fiber film of 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron and polysulfone membrane filter, after ultrafiltration, the separated removal of organism of different molecular weight;

(8) metal-organic complex ions exchange, molecular-weight gradation, chromatographic analysis, fluorescence-parallel factor analysis method are measured and are characterized.

Referring to Fig. 1, the schematic diagram that reacts of humic-acid kind organism and metal ion in the present embodiment, reaction equation:

R-COOH ^(HA)+M ²⁺?→[R-COO ^(HA)M] ⁺+H ⁺，R-OH ^(HA)+M ²⁺?→[R-O ^(HA)M] ⁺+H ⁺

The program of processing as shown in Figure 2.

Embodiment tri-:

Operation steps is as follows:

(1) by the flying dust of percolate and 105 ℃ of oven dry at ml:g=8:1, in the situation that rotating speed is 180 revs/min, in beaker, stir 24 hours;

(2) after completion of the reaction standing 30 minutes;

(3) supernatant liquor is crossed to 0.45 micron of filter membrane, flying dust solid is placed in 105 ℃ of oven dry of baking oven;

(4) by the flying dust of drying 400 ℃ of above calcinings in retort furnace, remove and adsorb, wrap up, be precipitated to the organism in flying dust.

Claims (1)

1. the cooperative processing method of a flying dust-percolate, it is characterized in that using for reference the theory of Green Chemistry, realize the treatment of wastes with processes of wastes against one another, the method of resource circulation utilization: percolate mixes according to following liquid-solid ratio with flying dust, through stirring, standing, filter, ultrafiltration, ion-exchange step is processed, treatment condition are as follows: liquid-solid ratio is between 4～100:1, stir 12～24h, standing 10～60 minutes, at centrifuge speed, be under 1000～3000 revs/min, centrifugal 5 minutes, percolate in ultrafiltration cup through 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, the blend fiber film of 0.001 micron and polysulfone membrane are filtered, ultrafiltration, nitrogen is protection gas, pressure range 0.05～0.30Mpa, concrete operation step is as follows:

(1) by 105 ± 5 ℃ of oven dry of flying dust, by 4～100:1 liquid-solid ratio, be added in percolate;

(2) solid-liquid centrifugation after stirring 24h;

(3) by solid in previous step in 105 ± 5 ℃ of oven dry, the mass loss before and after flying dust is 15%～35%, the flying dust after oven dry burns in retort furnace, removes the organic substance being adsorbed;

(4) in stirring reaction, part organic substance in percolate, wherein part is soil ulmin, with metallic ions Ca, Cu, Pb, Mg, Ni, Al, Cr, Zn, Mn, Fe and Hg, Cd ion forming complex or inner complex, sedimentation or be adsorbed in solid phase;

(5) in the situation that of liquid-solid ratio 4～100:1, the clearance of reacted Organic Pollutants of Landfill Leachate is 15%～90%, and colourity is down to tens from hundreds of;

(6) in flying dust metal ion leaching yield more than 30%;

(7) percolate through the blend fiber film of 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron and polysulfone membrane filter, after ultrafiltration, the separated removal of organism of different molecular weight;

(8) metal-organic complex ions exchange, molecular-weight gradation, chromatographic analysis, fluorescence-parallel factor analysis method are measured and are characterized;

Described flying dust is city garbage burning flying ash.

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