Unlock instant, AI-driven research and patent intelligence for your innovation.

Resourceful treatment method of heavy metals in household waste incineration fly ash

A technology of domestic waste incineration and treatment method is applied in the field of recycling treatment of heavy metals in domestic waste incineration fly ash.

Inactive Publication Date: 2019-06-04
HENAN NORMAL UNIV
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the resource utilization of incineration fly ash, it is usually detoxified by multi-stage water washing, and the cost is relatively high in the actual application process. Currently, Na 2 EDTA Combined Electrochemistry-Fe 3+ There are few reports on the application of persulfate system technology to the removal of heavy metals in fly ash from domestic waste incineration

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Resourceful treatment method of heavy metals in household waste incineration fly ash
  • Resourceful treatment method of heavy metals in household waste incineration fly ash
  • Resourceful treatment method of heavy metals in household waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, in the leaching toxicity test of the fly ash from the incineration of domestic garbage, the heavy metal content was Cu132.8 mg / L, Pb 19.54 mg / L, and Zn 502 mg / L. Weigh 30g of domestic waste incineration fly ash and place it in the ash column, and add 500mL0-0.1mol / LNa 2 The EDTA solution was passed through the ash column at a flow rate of 2 mL / min, and samples were taken at different times to measure the heavy metal content in the total waste liquid. After drying the fly ash residue, the toxicity leaching test was carried out to determine its heavy metal leaching concentration. The result showed that: 2 When the concentration of EDTA solution is 0.1mol / L, the leaching amount of heavy metals is the lowest and far below the standard value defined by the national standard, and the treatment effect is the best.

[0022] Table 1 shows the domestic waste incineration fly ash and different concentrations of Na 2 Toxicity leaching experiment of fly ash residue afte...

Embodiment 2

[0026] 500mL 0.1mol / L Na 2 The EDTA solution passes through the column containing the domestic waste incineration fly ash at a flow rate of 2 mL / min. At the same time, the waste liquid is collected, and the waste liquid obtained each time is collected together. Take 1L with 0.1mol / L Na 2 The waste liquid obtained by treating the fly ash with EDTA solution, and adding FeCl in a different ratio from EDTA 3 (EDTA:FeCl 3 =1:0-1:1.2) After it is completely dissolved, add 12mol / L hydrochloric acid solution to adjust the pH2 EDTA. And when the molar ratio Na 2 EDTA: FeCl 3 =1:0.05, the recovery rate of EDTA is the highest, 89.67%. When molar ratio Na 2 When EDTA:NaOH=1:3, Na can be recovered 2 EDTA.

[0027] Table 2 is to add Na 2 Different proportions of FeCl in EDTA 3 Recovery rate of EDTA obtained

[0028] n Na2EDTA :n Fe 3+

Embodiment 3

[0030] The waste liquid after the recovery of EDTA is placed in an electrolytic tank, in which iron plates are used as cathodes on both sides of the electrolytic tank, and graphite plates are used as anodes in the middle. After 24 hours of electrolysis at different current intensities (0-0.5A), the optimal current intensity was determined by detecting the concentration of heavy metals and COD in the solution. Then add different amounts of Oxone (potassium hydrogen persulfate composite salt) (0-0.8g) under the best current intensity, after 24 hours of electrolysis, determine the best Oxone quality by detecting the concentration of heavy metals and COD in the solution. Then, adjust the pH value (1.5-9) of the waste liquid under the best current intensity and the best amount of Oxone. After 24 hours of electrolysis, determine the best Oxone quality by detecting the concentration of heavy metals and COD in the solution.

[0031] Table 3 shows the concentration of heavy metals and COD...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a resourceful treatment method of heavy metals in household waste incineration fly ash. A Na<2>EDTA solution passes through a column loaded with the household waste incineration fly ash, removing of the heavy metals in the household waste incineration fly ash is completed, meanwhile liquid waste is collected, FeCl<3> is added, thus EDTA is recycled from the liquid waste, anelectrochemistry-Fe<3+> / persulfate combination system is utilized for treating waste water after the EDTA is recycled, and recycling of the heavy metals and removing of COD in the liquid waste are completed. According to the resourceful treatment method of the heavy metals in the household waste incineration fly ash, the electrochemistry-Fe<3+> / persulfate combination system is based on Na<2>EDTAleaching, the reaction time of heavy metal recycling in the incineration fly ash is short, the removing effect is good, after the household waste incineration fly ash is treated, the leaching toxicityof the heavy metals is reduced obviously, and the resourceful using of incineration fly ash residues is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of hazardous solid waste pollution control in environmental protection, and specifically relates to a resource treatment method for heavy metals in fly ash from domestic waste incineration. Background technique [0002] The incineration of domestic waste can reduce the chemical reactivity of harmful organic compounds and destroy the viruses or microorganisms contained therein. The proportion of urban domestic waste incineration in China is increasing year by year. It is estimated that by the end of 2020, the total amount of domestic waste incineration in the country will reach 630,000 tons / Day or more, the annual fly ash production is about 10 million tons. However, in the incineration process, 10%-20% of ash and slag are generated, which include slag and fly ash. The fly ash is collected by the flue gas purification system and heat recovery system and is a secondary pollutant. In addition, the fly ash usually ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 王春峰魏明杰尹元雪严晨芬张万鹏
Owner HENAN NORMAL UNIV