A method for co-processing organic solid waste and kitchen waste
A technology for food waste and organic solids, which is applied in the field of co-processing of organic solid waste and food waste, and can solve problems such as secondary pollution, insufficient degree of harmless mud cake, and high operating costs
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Embodiment 1
[0070] Such as figure 1 , a method for co-processing municipal sludge and kitchen waste, comprising the steps of:
[0071] A1. Receiving: receiving the sludge and transporting it to the homogeneous reactor for step A2;
[0072] A2, homogeneous mixing: mix the sludge transported in step A1 and the biogas residue and reflux biogas slurry produced in step C3 evenly in a homogeneous reactor, and the solid content of the mixture in the homogeneous reactor is between 5- 12wt%, in this example, the solid content is controlled at 10wt%.
[0073] A3, wet oxidation: under air or oxygen, the material mixed in step A2 is subjected to wet oxidation in the reactor, wherein air or oxygen is supplied to the reactor (in this example, what is supplied is 90% pure Oxygen), the oxidation condition is: temperature 50~250 ℃ (this example is specifically 220 ℃), reactor internal pressure 0.1~3.0MPa (this example is specifically 3.0MPa), reaction time 30~240min (this example is specifically 60min ...
Embodiment 2
[0092] The difference between this embodiment and embodiment 1 is:
[0093] The solid content in step A2 is controlled at 5wt%. In step A3: the temperature is 180° C., the pressure in the reactor is 1.5 MPa, the reaction time is 30 min, no catalyst is used, and the purity of the supplied oxygen is 80%. In step B5: the hydrothermal treatment temperature is 80° C., and the treatment time is 45 minutes. In step B7: the temperature is 55° C., the residence time is 3 d, and the solid content of the feed is 5 wt%. In step C2: the temperature is 55°C, and the residence time is 15d.
[0094] The method of this implementation case can realize the efficient and coordinated anaerobic digestion of municipal sludge and kitchen waste. The total COD of the sludge before and after the reaction is 46.6g / L and 30.7g / L, and the soluble COD after the reaction is 23.6g / L, the dissolution rate of sludge organic matter is 84.8%, which is lower than the mineralization rate of Example 1, which is 3...
Embodiment 3
[0096] Such as figure 2 Shown, its difference with embodiment 1 is: also include following step B8:
[0097] B8. Mechanical dehydration: the acidified material obtained in step B7 is first subjected to mechanical dehydration in step B8 to obtain filtrate and solid phase, and then the obtained filtrate is transported to the homogeneous tank for step C1, and the obtained solid phase is transported to step A2 to be separated from the sewage Sludge, biogas residue and return biogas slurry are mixed.
[0098] In the embodiment of the present invention, aiming at the characteristics of low sludge organic matter content, high proportion of refractory substances, and poor direct anaerobic digestion performance, wet oxidation technology is adopted to strengthen the decomposition and conversion of refractory organic matter and the transfer to the liquid phase, and then pass The mechanical dehydration method realizes the separation of sludge, that is, the obtained mud cake is basically...
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