Abstract: A redox water treatment method comprises first determining the composition of water and whether water treatment requires either oxidation or reduction, or both to optimize nitrogen removal by a bioreactor. Sulfur dioxide (SO2) is injected into the water to be treated to provide H+, SO2, SO3=, HSO3?, dithionous acid (H2S2O4), and other sulfur intermediate reduction products forming a sulfur dioxide treated water, which behaves either as a reducing agent or an oxidizing agent depending on the strength of the acid concentration, which alters sulfurous acid from a reducing agent to a more powerful oxidizing agent.

Abstract: A redox water treatment method comprises first determining the composition of water and whether water treatment requires either oxidation or reduction, or both to optimize nitrogen removal by a bioreactor. Sulfur dioxide (SO2) is injected into the water to be treated to provide H+, SO2, SO3=, HSO3?, dithionous acid (H2S2O4), and other sulfur intermediate reduction products forming a sulfur dioxide treated water, which behaves either as a reducing agent or an oxidizing agent depending on the strength of the acid concentration, which alters sulfurous acid from a reducing agent to a more powerful oxidizing agent.

Abstract: A redox water treatment method comprises first determining the composition of water and whether water treatment requires either oxidation or redaction, or both to optimize nitrogen removal by a bioreactor. Sulfur dioxide (SO2) is injected into the water to he treated to provide H+, SO2, SO3=, HS03?, dithionous acid (H2S2O4), and other sulfur intermediate reduction products forming a sulfur dioxide treated water, which behaves either as a reducing agent or an oxidizing agent depending on the strength of the acid concentration, which alters sulfurous acid from a reducing agent to a more powerful oxidizing agent.

Abstract: A chemical/mechanical sludge dewatering treatment method and apparatus injecting SO2 into wastewater inflow streams and/or conventional process liquid streams containing suspended solids at a pH and dwell time to generate sufficient sulfurous acid with free SO2, sulfites and bisulfites to disinfect and self-agglomerate the suspended solids, acid leach heavy metals contained in and on the suspended solids into solution for subsequent separation, condition the suspended solids for subsequent chemical dewatering shedding water upon separation and drying, and mechanically separating and disposing of any solids from its chemically treated liquid fraction to create a Class A biosolid drying to less than 10% by weight water content.