CN102874946A - 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 in the at present both at home and abroad research to the processing method of disposal of incineration of refuse flyash to solidify stabilization method as main, comprise cement and bituminization, melting and solidification, chemical agent solidification and stabilization.Percolate does not often reach emission standard through after the biochemical treatment, also needs advanced treatment.In the treatment process of flying dust in various degree waste resource, increased the cost of processing.Therefore, expect flying dust and percolate associated treatment, the saving of resource and cost when wishing to reach part organic matter removal in the percolate and processing flying dust, so just for processing percolate and flying dust a kind of collaborative resource utilization road newly is provided.

Summary of the invention

Be rich in great amount of soluble heavy metal and salt in the flying dust that the object of the invention is to produce for burning city domestic garbage, 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 removing of solvend and heavy metal stabilization, with the raw material of pre-treatment flying dust as preparation eco-cement etc., realize the target of flying dust high added value recycling.

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

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

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

A kind of cooperative processing method of 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) with 105 ± 5 ℃ of oven dry of flying dust, is added in the percolate by 4～100:1 liquid-solid ratio;

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

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

(4) in stirring reaction, part organic substance in the 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 the solid phase;

(5) in the situation that 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 the flying dust metal ion leaching yield more than 30%;

(7) percolate through 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron blend fiber film and polysulfone membrane filter, after the ultrafiltration, the separated removal of the 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 the percolate, some hazardous and noxious substances such as complex compound of metal-organic are adsorbed, are transferred in the flying dust by selectivity, and the color of percolate can shoal even disappear simultaneously.Percolate COD clearance is 15%～90%.

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

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

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

The treatment effect table:

Add flying dust amount g in the 1L percolate	The clearance of COD (%) in the 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 the Hazardous wastes judging standard, and Zn, Pb, Cd might exceed standard.Present method not only reaches good treatment effect, and does not need to add medicine, and has realized the treatment of wastes with processes of wastes against one another, and the flying dust after the recycling can be used as the utilizations such as cement, pavior, material of construction, stupalith.

Description of drawings

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

Embodiment

Embodiment one:

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

Liquid-solid ratio is between 4～100:1; stir 12～24h; left standstill 10～60 minutes; be under 1000～3000 rev/mins at centrifuge speed; 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 the ultrafiltration cup filtered, ultrafiltration, and nitrogen is protector, pressure range 0.05-0.30MPa.

Embodiment two:

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

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

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

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

(4) in stirring reaction, part organic substance in the 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 the solid phase;

(5) in the situation that 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 the flying dust metal ion leaching yield more than 30%;

(7) percolate through 1.2 microns, 0.45 micron, 0.22 micron, 0.10 micron, 0.01 micron, 0.001 micron blend fiber film and polysulfone membrane filter, after the ultrafiltration, the separated removal of the 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 reaction schematic diagram 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 three:

Operation steps is as follows:

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

(2) reaction was left standstill 30 minutes after complete;

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

(4) with flying dust calcining more than 400 ℃ in retort furnace of oven dry, remove and adsorb, wrap up, be precipitated to the organism in the flying dust.

Claims (2)

1. the cooperative processing method of a 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:

Percolate mixes according to following liquid-solid ratio with flying dust, through stirring, leaves standstill, filter, and ultrafiltration, ion-exchange step is processed, and treatment condition are as follows:

Liquid-solid ratio is between 4～100:1; stir 12～24h; left standstill 10～60 minutes; be under 1000～3000 rev/mins at centrifuge speed; 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 the ultrafiltration cup filtered, ultrafiltration, and nitrogen is protector, pressure range 0.05～0.30MPa.

2. the cooperative processing method of flying dust-percolate according to claim 1 is characterized in that concrete operation step is as follows:

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

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

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

(4) in stirring reaction, part organic substance in the 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 the solid phase;

(5) in the situation that 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 the flying dust metal ion leaching yield more than 30%;

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

Images