Method for processing refuse-burning fly-ash by using magnesium ammonium phosphate sedimentation sludge

A technology for waste incineration fly ash and sludge treatment, which is applied in the fields of flocculation/sedimentation water/sewage treatment, sewage/sludge fertilizer, etc. low cost effect

Active Publication Date: 2006-12-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while NH 3 -N concentration greater than 500mg/L may have an inhibitory effect on aerobic nitrifying bacteria; at the same time, the BOD of leachate 5 The

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Firstly, the initial concentration of ammonia nitrogen in the high-concentration ammonia-nitrogen wastewater was determined, according to Mg 2+ : NH 4 + :PO 4 3- Molar ratio of 1:1:1.1 dosing agent (MgSO 4 , NaH 2 PO 4 2H 2 O), the wastewater was stirred or aerated and mixed for 40 minutes after the dosing, and then the treated wastewater was statically settled for 30 minutes. After removing the supernatant from the effluent, the remaining sedimentation sludge is used for later use.

[0024] Adjust the ratio of the two materials according to the ratio of sedimentation sludge to waste incineration fly ash of 1:9 (dry basis) and the liquid-solid ratio of about 1:3, stir and mix them evenly, and maintain them in the air at room temperature for 1 day to make the reaction Adequate, measure the leaching concentration of heavy metal ions, and after reaching the standard, it can be directly sent to the landfill site for burial.

Embodiment 2

[0026] Firstly, the initial concentration of ammonia nitrogen in the high-concentration ammonia-nitrogen wastewater was determined, according to Mg 2+ : NH 4 + :PO 4 3- Dosing agents (MgO, Na 2 HPO 4 12H 2 0), the wastewater was stirred or aerated and mixed for 100 minutes after the dosing, and then the treated wastewater was statically settled for 40 minutes. After removing the supernatant from the effluent, the remaining sedimentation sludge is used for later use.

[0027] According to the requirement that the ratio of sedimentation sludge to waste incineration fly ash is 1:8 (dry basis), and the liquid-solid ratio is about 1:3, adjust the ratio of the two materials, stir and mix them evenly, and maintain them in the air at room temperature for 1 day. The reaction is sufficient, and the leaching concentration of heavy metal ions is measured. After reaching the standard, it can be directly sent to the landfill for burial.

Embodiment 3

[0029] Firstly, the initial concentration of ammonia nitrogen in the high-concentration ammonia-nitrogen wastewater was determined, according to Mg 2+ : NH 4 + :PO 4 3- Dosing agent (MgO, K 2 HPO 4 ·3H 2 0), the wastewater was stirred or aerated and mixed for 150 minutes after the dosing, and then the treated wastewater was statically settled for 60 minutes. After removing the supernatant from the effluent, the remaining sludge will be used.

[0030] According to the ratio of sedimentation sludge to waste incineration fly ash of 1:1 (dry basis), the liquid-solid ratio is about 1:3, adjust the ratio of the two materials, stir and mix, and maintain in the air at room temperature for 2 days to make the reaction Sufficient, measure the leaching concentration of heavy metal ions, and can be used as soil conditioner or fertilizer after reaching the standard.

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Abstract

The invention discloses a together-disposing method of burnt rubbish ash and high-density ammonia nitrogen waste water, which comprises the following steps: testing density of ammonia nitrogen in the waste water; putting Mg2+ and PO43- in the waste water according to 1:0.9-1.0:1.0-1.2 molar rate for NH4+:Mg2+:PO43-; stirring or aerating for 20-120 min; sedimenting 20-60 min; removing supernatant; adjusting liquid-solid rate at 1:3 for remained mud and burnt rubbish ash; stirring evenly; curing 1-2 day at normal temperature; testing heavy metal immersed density of sample; burying directly or making soil modifier or fertilizer after reaching national standard limit.

Description

technical field [0001] The method for treating waste incineration fly ash with ammonium magnesium phosphate precipitation sludge relates to a co-disposal technology of waste incineration fly ash and high-concentration ammonia nitrogen wastewater, which belongs to waste co-disposal and utilization technology. Background technique [0002] The MSWI (Municipal Solid Waste Incineration) fly ash produced in the waste incineration process is mainly composed of basic oxides, and its aqueous solution is strongly alkaline (solid-liquid ratio 1:10, pH>12.0). Fly ash is classified as hazardous waste because it is enriched in a large amount of soluble heavy metals, salts and a small amount of highly toxic organic pollutants. The current regulations in my country stipulate that it must be stabilized before it can be landfilled or used. [0003] MSWI fly ash chemical stabilization technology uses chemical agents (such as: phosphates, iron oxides, sulfides and...

Claims

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Application Information

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IPC IPC(8): C02F1/52C05F7/00
CPCY02A40/20
Inventor 何品晶张后虎邵立明章骅
Owner TONGJI UNIV
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