![]() ![]() Mixing systems can also reduce the impact of toxic materials (i.e. (This is buffered somewhat by an increase in alkalinity through formation of carbon dioxide.) Feeding large quantities of fresh substrates into the AD reactor can also depress pH, which can be mitigated by good mixing inside the reactor. Production of organic acids in the second stage of AD lowers the pH, which can inhibit the formation rate of methane. The anaerobic bacteria that produce the methane (which forms the basis of biogas) are sensitive to the pH of the substrate they live in. Temperature determines the rate of hydrolysis and methane formation, so uniformity in temperature is an important consideration. HRT/SRT and the rate waste is fed influence the size of the AD reactor. The main factors that influence the rates (and, therefore, the success) of these biological transformations in the AD reactor are hydraulic and solids residence time (HRT/SRT), temperature, pH and the presence of toxic materials. ![]() These conversion processes consume the volatile solids in the substrates (feedstocks) being digested, which stabilize the substrate through reduction in its putrescibility, and is important to formation of a high quality digestate. Regardless of reactor type, all AD plants operate on the same sequential biological principles of anaerobic decomposition: hydrolysis of proteins, cellulose, lipids and other complex organics into more soluble forms conversion of those solutes into organic acids and conversion of those acids into biogas, resulting in the residual digestate. Learn more about velocity gradients and non-Newtonian behavior in a Q&A with Gene Smith of SUMA ![]()
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