Treatment method of wastewater containing ammonia nitrogen and cod
A treatment method and technology for wastewater are applied in the field of treatment of wastewater containing ammonia nitrogen and COD, and can solve problems such as low efficiency
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Embodiment 1
[0051] 1. Catalyst preparation
[0052] In terms of weight ratio, ZrO 2 :Ru:Sn is 97:1:2 to prepare the catalyst.
[0053] 97 parts of ZrO 2 The catalyst support is impregnated with RuCl equivalent to 1 part Ru at room temperature 3 and 2 parts Sn of SnCl 4 RuCl 3-SnCl 4 100 parts of the mixed aqueous solution were dried overnight at 80° C. for 12 hours, and then reduced for 4 hours at 300° C. under a hydrogen atmosphere (hydrogen-nitrogen mixture with a hydrogen content of 4%) to obtain a catalyst. The formulation of the catalyst is shown in Table 1.
[0054] 2. Catalyst evaluation
[0055] Using industrial acrylonitrile wastewater as raw material, the COD value of the wastewater is 29,700mg / L, and the ammonia nitrogen is 1,735mg / L. Wastewater mixed with oxygen passes through a 125mL fixed-bed reactor filled with 150g of catalyst. The reaction temperature in the reactor was 260° C., the pressure was 8.5 MPa, and the residence time was 60 minutes. The reaction result...
Embodiment 2
[0057] 1. Catalyst preparation
[0058] In terms of weight ratio, ZrO 2 :Rh:Sn is 97:1:2 to prepare the catalyst.
[0059] 97 parts of ZrO 2 The catalyst support is impregnated with RhCl equivalent to 1 part Rh at room temperature 3 and 2 parts Sn of SnCl 4 RhCl 3 -SnCl 4 100 parts of the mixed aqueous solution were dried overnight at 80° C. for 12 hours, and then reduced for 4 hours at 300° C. under a hydrogen atmosphere (hydrogen-nitrogen mixture with a hydrogen content of 4%) to obtain a catalyst. The formulation of the catalyst is shown in Table 1.
[0060] 2. Catalyst evaluation
[0061] Using industrial acrylonitrile wastewater as raw material, the COD value of the wastewater is 29,700mg / L, and the ammonia nitrogen is 1,735mg / L. Wastewater mixed with oxygen passes through a 125mL fixed-bed reactor filled with 150g of catalyst. The reaction temperature in the reactor was 260° C., the pressure was 8.5 MPa, and the residence time was 60 minutes. The reaction resul...
Embodiment 3
[0063] 1. Catalyst preparation
[0064] In terms of weight ratio, ZrO 2 :Pt:Sn is 97:1:2 to prepare the catalyst.
[0065] 97 parts of ZrO 2 The catalyst support was impregnated with 1 part of Pt in H at room temperature 2 PtCl 6 and 2 parts Sn of SnCl 4 H 2 PtCl 6 -SnCl 4 100 parts of the mixed aqueous solution were dried overnight at 80° C. for 12 hours, and then reduced for 4 hours at 300° C. under a hydrogen atmosphere (hydrogen-nitrogen mixture with a hydrogen content of 4%) to obtain a catalyst. The formulation of the catalyst is shown in Table 1.
[0066] 2. Catalyst evaluation
[0067] Using industrial acrylonitrile wastewater as raw material, the COD value of the wastewater is 29,700mg / L, and the ammonia nitrogen is 1,735mg / L. Wastewater mixed with oxygen passes through a 125mL fixed-bed reactor filled with 150g of catalyst. The reaction temperature in the reactor was 260° C., the pressure was 8.5 MPa, and the residence time was 60 minutes. The reaction re...
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