In the work [103] the mechanism of the organic substances anaerobic decomposition is presented, As it is seen from the presented mechanism, the process of organic substances anaerobic decomposition proceeds with peroxide mechanism, where the role of performic acid HCO₃H is important. 26 reactions of 41 presented proceed with HCO₃H participation. Those are the following reactions:

Some reactions of fermentative bacteria

CH₃COCOO^- + CH₃COO^- + NADH + H⁺ = CH₃CH₂CH₂COO^- + NAD+ + HCO₃^-

NA- not applicable

2CH₃COCOO^- + 2H₂O = CH₃CH₂CH₂COO^- + 2HCO^- + H⁺

CH₃COCOO^- + HCO₃^- + 2NADH + 2H⁺ = ^-OOCCH₂CH₂COO^- + 2H₂O +2 NAD⁺

CH₃COCOO^- + H₂O + NADH + H⁺ = CH₃CH₂OH + HCO₃^- + NAD⁺

CH₃CHOHCOO^- = 2CH₃CH₂COO^- + CH₃COO^- + HCO₃^- + H⁺

CH₃COCOO^- + 2H₂O = CH₃COO^- + HCO₃^- + H⁺ + H₂

Some reactions of methanogenic bacteria

4H₂ + HCO₃^- + H⁺ = CH₄ + 3H₂O

4HCO₂^- + H₂O + H⁺ = CH₄ + 3HCO₃^-

4CH₃OH = 3CH₄ + HCO₃^- + H⁺ + H₂O

CH₃COO^- + H₂O = CH₄ + HCO₃^-

4CH₃NH₃⁺ + 3H₂O = 3CH₄ + 4NH₄⁺ + HCO₃^- +H⁺

Reaction of sufate - reducing bacteria

2CH₃CHOHCOO^- + SO₄^-2 = 2CH₃COO^- + HS^- + H⁺ +2HCO₃^-

Some idealized reactions of fermentative bacteria ( without H₂ - utilizing methanogenic bacteria )

C₆H₁₂O₆ + 2CH₃COO^- = 2CH₃CH₂COO^- + 2HCO₃^- +2H⁺

C₆H₁₂O₆ + H₂O = CH₃CH₂COO^- + CH₃COO^- + HCO₃^- + H₂ + 3H⁺

C₆H₁₂O₆ + 2H₂O = 2CH₃CH₂OH + 2HCO₃^- + 2H⁺

( with H₂ - utillizing methanogenic bacteria )

C₆H₁₂O₆ + H₂O = 2CH₃COO^- + CH₄ + HCO₃^- +3H⁺

Some reactions of proton - reducing acetogenic bacteria

( without H₂ - utilizing methanogenic bacteria )

CH₃CHOHCOO^- + 2H₂O = CH₃COO^- + HCO₃^- + H⁺ +2H₂

C₇H₆O₂ + 7H₂O = 3CH₃COO^- + HCO₃^- +3H₂

( with H₂- utilizing methanogenic bacteria )

2CH₃CHOHCOO^- + H₂ = 2CH₃COO^- + HCO₃^- + CH₄ + H⁺

2CH₃CH₂OH + HCO₃^- = 2CH₃COO^- + CH₄ + H₂O + H⁺

2CH₃CH₂CH₂COO^- + HCO₃^- + H₂O = 4CH₃COO^- + CH₄ + H⁺

2CH₃CH₂CH₂CH₂COO^- + HCO₃^- + H₂O = 2CH₃CH₂COO^- + 2CH₃COO^- + CH₄ + H⁺

2CH₃(CH₂)₁₄COO^- + 7HCO₃^- + 7H₂O = 16CH₃COO^- + 7CH₄ + 7H⁺

4C7H₆O₂ + 19H₂O = 12CH₃COO^- + 3CH₄ + HCO₃^- + 9H⁺

Complete degradation to CO₂ and CH₄

C₆H₁₂O₆ + 3H₂O = 3CH₄ + 3HCO₃^- + 3H⁺

2CH₃CHOHCOO^- + 3H₂O = 3CH₄ + 3HCO₃^- +H⁺

There is the following relation between the free energy change of the chemical reaction and the reaction speed stability [22]:

-D GO` = 4,575 . T ( lnK - 10,3 - lnT ).

This expression gives the opportunity to calculate the speed stability of the reactions proceeding with HCO₃H participation for each reaction. The calculations are based on the thing, that H₂ and CH₄ are in gas phase and the substance concentration which are in solution are 1 mol.

lnK = lnT + D GO` : ( 4,575 . T ) + 10,3.