A method for increasing the content of sodium bicarbonate-extracted phosphorus in livestock and poultry feces biochar
A technology of livestock and poultry manure and sodium bicarbonate, which is applied in the field of resource utilization of solid waste, can solve the problems of low efficiency and achieve the effects of abundant resources, improved operation and low price
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Embodiment 1
[0022] The laboratory selected pig manure from a farm in Zhejiang Province, and processed it according to the following steps:
[0023] Pig manure (PM) samples were dried in an oven at 85°C for 5 hours to reduce the moisture content to below 0.1wt%, and after cooling, they were ground and sieved to obtain a finely ground sample with a particle size of ≤100 mesh; %: The ratio of 20wt% is uniformly mixed, and then the resulting mixture and the finely ground sample are respectively placed in a fixed-bed pyrolysis reactor, and the mixture is mixed with N 2 As a protective gas with a flow rate of 80mL min -1 , the heating rate of the reactor was 15°C·min -1 , the final pyrolysis temperature was set at 600°C, and the pyrolysis was carried out at a constant temperature for 45 minutes, and then cooled to room temperature with the furnace to obtain livestock and poultry manure biochar PMB (100% pig manure pyrolysis biochar) and PC20 (20% rice bran + 80% pig manure mixed pyrolyzed bio...
Embodiment 2
[0032] Bamboo chips, rice husks and wood chips were selected as additives for comparison, and compared with that of rice bran in Example 1, the addition ratio was 20%. The biochar preparation and phosphorus detection were consistent with those in Example 1, and the results are shown in Table 2. Among them, PM is pig manure, and the obtained biochar is sequentially recorded as PMB (100% pig manure pyrolysis biochar), PB20 (20% bamboo chips + 80% pig manure mixed pyrolysis biochar), PC20 (20% rice bran + 80% % pig manure mixed pyrolysis biochar), PR20 (20% chaff + 80% pig manure mixed pyrolysis biochar), PW20 (20% sawdust + 80% pig manure mixed pyrolysis biochar).
[0033] Table 2 Comparison of the impact of different additives on phosphorus form (g / kg)
[0034]
[0035]
[0036] It can be seen from the above table that, compared with the original pig manure and pig manure biochar, the mixed pyrolysis of pig manure with wood chips, bamboo chips, and rice husks as additive...
Embodiment 3
[0037] Example 3: Biochar Characteristics
[0038] The main performance indicators of 100% pig manure pyrolysis biochar (PM100) and biochar PC10, PC20 and PC30 obtained by adding 10%, 20%, 30% rice bran and pig manure mixed pyrolysis are shown in Table 4. It can be seen from Table 4 that the ash and volatile content of biochar obtained by adding rice bran and pig manure mixed pyrolysis decreased, and the fixed carbon content increased. The content of Cu, the main heavy metal pollutant in livestock and poultry manure is reduced, and the leaching property of TCLP is reduced to 0. Therefore, the ecological risk of heavy metals is lower than that of pig manure alone. The above results indicated that, compared with the pyrolysis of pig manure alone, the mixed pyrolysis of rice bran and pig manure significantly increased the NaHCO content in biochar. 3 -P content, on the other hand has better environmental safety.
[0039] Table 4 The main technical indicators of biochar
[0040]...
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