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The leaching solution composition of added carbon sources was analyzed. Identical amounts of maize stalks and MSSH (5 g, dry weight) were placed in two airtight flasks with 500 mL deionized water and soaked at 20 °C for 3 days. In addition, the liquid used to pretreat the maize stalks was also analyzed (hereafter referred to as PMSSH). The mixed liquor was then filtered and analyzed to determine the leaching solution composition (Table 2).

Table 2

Concentration of elements in the leaching solutions of the carbon sources

Composition/(mg/L)Leaching solution
Maize stalksMSSHPMSSH
Mg 330 170 210 
Al 0.26 0.02 0.2 
Mn 0.007 0.002 0.004 
Ca 35 15 27 
Fe 0.32 0.03 0.08 
Ni 1.85 0.7 0.8 
41 12 1.5 
Cu 1.35 0.34 1.2 
Cr6+ 0.33 0.18 0.04 
NO3-N 4.63 3.95 1.5 
NO2-N 0.8 0.012 38.2 
NH4+-N 104.75 13.6 0.012 
Composition/(mg/L)Leaching solution
Maize stalksMSSHPMSSH
Mg 330 170 210 
Al 0.26 0.02 0.2 
Mn 0.007 0.002 0.004 
Ca 35 15 27 
Fe 0.32 0.03 0.08 
Ni 1.85 0.7 0.8 
41 12 1.5 
Cu 1.35 0.34 1.2 
Cr6+ 0.33 0.18 0.04 
NO3-N 4.63 3.95 1.5 
NO2-N 0.8 0.012 38.2 
NH4+-N 104.75 13.6 0.012 

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