Liquid treatment system with air emission control

A method for operating a complete water treatment and gas emission control system comprising the following continuous process steps:

• (a) pumping and discharging a contaminated water into a water treatment means,
• (b) adjusting the hydraulic residence time of said water treatment means to conform to different flow rates of incoming said contaminated water and providing sufficient gas head space above a water level inside said water treatment means,
• (c) feeding a gas, microorganisms, a chemical, or combinations thereof, into said water treatment means for removing contaminants from said contaminated water inside said water treatment means,
• (d) bubbling gas bubbles through a water phase comprising the contaminated water inside said water treatment means,
• (e) physically stripping residual volatile contaminants from the water phase into a gas phase inside said water treatment means by said gas bubbles,
• (f) collecting, transporting, dehumidifying, bypassing, purifying, recycling, and reusing an emitted gas stream from said water treatment means using the following steps of a gas emission control process:
• collecting said emitted gas stream from said water treatment means,
• moving said emitted gas stream from said water treatment means, and removing humidity from said emitted gas stream, thereby producing a dehumidified emitted gas stream,
• monitoring said dehumidified emitted gas stream for a condition selected from the group consisting of gas flow, vacuum, pressure, humidity, or combinations thereof,
• sampling and determining the gas quality of said dehumidified emitted gas stream,
• bypassing and diluting a portion of said dehumidified emitted gas stream with air;
• producing an air-diluted emitted gas stream;
• and discharging said air-diluted emitted gas stream,
• diluting the remaining non-bypassed portion of said dehumidified emitted gas stream with at least one inert gas, thereby producing an inert gas diluted gas stream,
• purifying said inert gas diluted gas stream with a purifying agent, thereby producing a contactor effluent;
• sampling for determining the gas quality of said contactor effluent, and the efficiency of said gas emission control process in removing volatile contaminants,
• bypassing and diluting a portion of said contactor effluent with air, producing an air-diluted contactor effluent, and discharging said air-diluted contactor effluent to an ambient air environment,
• recycling the remaining non-bypassed portion of said contactor effluent to said water treatment means for further treating said contaminated water, and generating additional emitted gas stream, and
• providing a make-up gas to said water treatment means for further treating said contaminated water,
• (g) repeating step (d) for a plurality of times,
• (h) treating the water phase inside said water treatment means for a specific residence time using said gas bubbles, chemical, microorganisms, or combinations thereof, thereby producing a water effluent,
• (i) clarifying the water effluent of said water treatment means for separating the insoluble microorganisms, chemical, contaminants, or combinations thereof from the water effluent, thereby producing a clarified effluent and a separated sludge stream;
• recycling a portion of the separated sludge stream to said water treatment means upon demand, and discharging the remaining separated sludge stream, and
• (j) filtering, disinfecting, or both filtering and disinfecting the clarified effluent before the clarified effluent is discharged.