Surge anoxic mix sequencing batch reactor systems

A surge anoxic mix, sequencing batch reaction method for treating wastewater to reduce its solids content, biological oxygen demand (BOD) and nitrogenous content in an overall sequencing batch reaction treatment cycle time of less than 20 hours, comprising a sequencing batch treatment cycle of processing steps of:

• providing an anoxic waste liquid treatment zone and one or more separate aerobic sequencing waste liquid treatment zones wherein the ratio of the volume of the anoxic waste liquid treatment zone to the volume of the one or more aerobic sequencing waste liquid treatment zones is in the range of from about 0.2:
• to about 1:1;
• introducing influent wastewater containing wastewater solids content, BOD and nitrogenous content to be treated into the anoxic waste liquid treatment zone containing waste solids including treatment microorganisms under anoxic conditions;
• introducing wastewater and treatment microorganisms from said anoxic waste liquid treatment zone into the one or more aerobic sequencing waste liquid treatment zones containing waste solids including treatment microorganisms under aerobic conditions;
• mixing and aerating the waste liquid in the one or more aerobic sequencing batch aeration treatment zones for at least half of said overall sequencing batch reaction treatment cycle time to reduce the biological oxygen demand of the wastewater and to convert at least a portion of the nitrogenous wastewater content to inorganic nitrate or nitrite components;
• introducing and mixing waste liquid and treatment microorganisms from the one or more aerobic sequencing waste liquid treatment zones into the anoxic waste liquid treatment zone at a rate of at least about 0.1 of the total volume of anoxic zone per hour during an interaction time period, to provide nitrate or nitrite oxidizing components from the one or more aerobic sequencing batch reaction treatment zones for the anoxic treatment microorganism metabolism and to convert the nitrate or nitrite components to nitrogen for removal from the wastewater in the anoxic mix treatment zone;
• subsequently to said mixing and aeration steps, maintaining the waste liquid in the one or more aerobic sequential batch wastewater treatment zones in a quiescent state without said mixing and aerating, for a settling time period of from about 10 to about 30 percent of said overall total treatment cycle time to form in the respective one or more sequencing batch aeration zones, a clarified upper layer and a stratified lower layer containing waste solids including treatment microorganisms;
• and
• removing a predetermined portion of the clarified upper layer from the respective one or more sequencing aeration treatment zones as a treated effluent stream having reduced solids content, BOD and nitrogenous content with respect to said influent wastewater.