Method for treating household garbage leachate by utilizing household garbage incineration fly ash

Abstract

The invention discloses a method for treating household garbage leachate by using household garbage incineration fly ash. The method comprises the steps: adding a hydrochloric acid aqueous solution into the household garbage leachate; respectively weighing water and the household garbage incineration fly ash, mixing, stirring and centrifuging for solid-liquid separation to obtain household garbageincineration fly ash water washing liquid and fly ash solid slurry; carrying out electric treatment on the household garbage incineration fly ash water washing liquid, capturing gas generated by an electric anode chamber, directly introducing the gas into the acidified household garbage leachate, and aerating the household garbage leachate; scraping and filtering the household garbage leachate toobtain oily nitrogen trichloride and denitrified leachate; weighing an iron-aluminum agent and the fly ash solid slurry, and carrying out vacuum drying to obtain fly ash purified powder; and weighingthe denitrification leachate and the fly ash purification powder, mixing, stirring, and carrying out solid-liquid separation to obtain the household garbage leachate purification liquid and gelatinized fly ash solid slurry. 86% of nitrogen trichloride can be recycled at most, and 98% of ammonia nitrogen, 97% of COD, 98% of total phosphorus and 98% of mercury in the landfill leachate can be removed.

Description

technical field

[0001] The invention relates to the field of harmless disposal of hazardous waste, in particular to a method for disposing of domestic waste leachate by using domestic waste incineration fly ash, and in particular to recovering nitrogen trichloride from domestic waste leachate with domestic waste incineration fly ash and A method for realizing the purification of domestic garbage leachate. Background technique

[0002] Domestic waste under landfill is in an anaerobic and humid environment, subject to continuous biological and chemical degradation. Coupled with surface water intrusion and groundwater infiltration, the high-concentration organic and inorganic pollutants in domestic waste are transferred to the liquid state to form domestic waste leachate. The composition of domestic waste leachate is very complex. If it is not treated for a long time, it will easily cause serious pollution to the surrounding water and soil environment and bring harm to the hea...

Examples

Embodiment 1

[0028] Example 1 Influence of domestic waste leachate pH on nitrogen trichloride recovery rate and domestic waste leachate purification effect

[0029] Add hydrochloric acid aqueous solution to domestic waste leachate, make its pH respectively 1, 1.5, 2, 2.5, 3.5, 4.5, 5, 5.5, 6, obtain nine groups of acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 5%. Water and domestic waste incineration fly ash were weighed according to the liquid-solid ratio of water and domestic waste incineration fly ash 1: 1mL / mg, mixed, stirred for 0.5 hours, and centrifuged for solid-liquid separation to obtain nine groups of domestic waste incineration fly ash water washing solutions and nine groups. Group fly ash solid slurry. Adding water washing solution to nine groups of domestic waste incineration fly ash figure 2 Electric treatment is carried out in the sample disposal area of ​​the electric device, and the gas ge...

Embodiment 2 2

[0044] Example 2 Influence of Ferrous Iron and Trivalent Aluminum Molar Ratio on Nitrogen Trichloride Recovery Rate and Household Garbage Leachate Purification Effect

[0045] Add hydrochloric acid aqueous solution to the domestic waste leachate to make the pH 4.5 to obtain acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 12.5%. Weigh water and domestic waste incineration fly ash according to the liquid-solid ratio of water and domestic waste incineration fly ash 2.5:1mL / mg, mix, stir for 1 hour, and centrifuge for solid-liquid separation to obtain domestic waste incineration fly ash washing liquid and fly ash solid pulp. Add such as figure 2 Electric disposal is carried out in the sample disposal area of ​​the electric device, and the gas generated by the anode chamber of the electric device is captured synchronously and directly passed into the acidified domestic waste leachate through the aerati...

Embodiment 3

[0051] Example 3 Effect of mass ratio of iron-aluminum agent and fly ash solid slurry on recovery rate of nitrogen trichloride and purification effect of domestic waste leachate

[0052] Add hydrochloric acid aqueous solution to domestic waste leachate to make pH 4.5 to obtain acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 20%. Weigh water and domestic waste incineration fly ash according to the liquid-solid ratio of water and domestic waste incineration fly ash 4: 1mL / mg, mix, stir for 1.5 hours, centrifuge for solid-liquid separation, and obtain domestic waste incineration fly ash washing liquid and fly ash solid pulp. Add such as figure 2 Electric disposal is carried out in the sample disposal area of ​​the electric device, and the gas generated by the anode chamber of the electric device is captured synchronously and directly passed into the acidified domestic waste leachate through the aerat...

technical field

[0001] The invention relates to the field of harmless disposal of hazardous waste, in particular to a method for disposing of domestic waste leachate by using domestic waste incineration fly ash, and in particular to recovering nitrogen trichloride from domestic waste leachate with domestic waste incineration fly ash and A method for realizing the purification of domestic garbage leachate. Background technique

[0002] Domestic waste under landfill is in an anaerobic and humid environment, subject to continuous biological and chemical degradation. Coupled with surface water intrusion and groundwater infiltration, the high-concentration organic and inorganic pollutants in domestic waste are transferred to the liquid state to form domestic waste leachate. The composition of domestic waste leachate is very complex. If it is not treated for a long time, it will easily cause serious pollution to the surrounding water and soil environment and bring harm to the hea...

Examples

Embodiment 1

[0028] Example 1 Influence of domestic waste leachate pH on nitrogen trichloride recovery rate and domestic waste leachate purification effect

[0029] Add hydrochloric acid aqueous solution to domestic waste leachate, make its pH respectively 1, 1.5, 2, 2.5, 3.5, 4.5, 5, 5.5, 6, obtain nine groups of acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 5%. Water and domestic waste incineration fly ash were weighed according to the liquid-solid ratio of water and domestic waste incineration fly ash 1: 1mL / mg, mixed, stirred for 0.5 hours, and centrifuged for solid-liquid separation to obtain nine groups of domestic waste incineration fly ash water washing solutions and nine groups. Group fly ash solid slurry. Adding water washing solution to nine groups of domestic waste incineration fly ash figure 2 Electric treatment is carried out in the sample disposal area of ​​the electric device, and the gas ge...

Embodiment 2 2

[0044] Example 2 Influence of Ferrous Iron and Trivalent Aluminum Molar Ratio on Nitrogen Trichloride Recovery Rate and Household Garbage Leachate Purification Effect

[0045] Add hydrochloric acid aqueous solution to the domestic waste leachate to make the pH 4.5 to obtain acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 12.5%. Weigh water and domestic waste incineration fly ash according to the liquid-solid ratio of water and domestic waste incineration fly ash 2.5:1mL / mg, mix, stir for 1 hour, and centrifuge for solid-liquid separation to obtain domestic waste incineration fly ash washing liquid and fly ash solid pulp. Add such as figure 2 Electric disposal is carried out in the sample disposal area of ​​the electric device, and the gas generated by the anode chamber of the electric device is captured synchronously and directly passed into the acidified domestic waste leachate through the aerati...

Embodiment 3

[0051] Example 3 Effect of mass ratio of iron-aluminum agent and fly ash solid slurry on recovery rate of nitrogen trichloride and purification effect of domestic waste leachate

[0052] Add hydrochloric acid aqueous solution to domestic waste leachate to make pH 4.5 to obtain acidified domestic waste leachate, wherein the mass fraction of hydrochloric acid in the hydrochloric acid aqueous solution is 20%. Weigh water and domestic waste incineration fly ash according to the liquid-solid ratio of water and domestic waste incineration fly ash 4: 1mL / mg, mix, stir for 1.5 hours, centrifuge for solid-liquid separation, and obtain domestic waste incineration fly ash washing liquid and fly ash solid pulp. Add such as figure 2 Electric disposal is carried out in the sample disposal area of ​​the electric device, and the gas generated by the anode chamber of the electric device is captured synchronously and directly passed into the acidified domestic waste leachate through the aerat...

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