Compositions and method for wastewater treatment
AssigneeInland Environmental Resources, Inc.
InventorsDouglas George Kellely, Peter Nelson Svebakken, Andrew Rossetti
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Abstract
A method of treating wastewater in sewer lines prevents or inhibits the formation and release of hydrogen sulfide from the wastewater. The method includes the step of injecting a water treatment chemical that reacts with sulfur in the sewer line only when the instant flow rate of wastewater is below a threshold flow rate at which hydrogen sulfide is most likely to form and release.
Claims28
A method of regulating the feed of wastewater treatment chemical in a section of sewer pipeline having a first and a second end, comprising the steps of:
- obtaining a wastewater flow rate profile for the section of sewer pipeline;
- initiating a feed of wastewater treatment chemical at the first end of the section of sewer pipeline when the wastewater flow rate falls below a first threshold;
- and
- discontinuing the feed of wastewater treatment chemical at the first end of the section of sewer pipeline when the wastewater flow rate rises above a second threshold.
A method of regulating the feed of wastewater treatment chemical in a section of sewer pipeline having a first and a second end, comprising the steps of:
- obtaining a wastewater flow rate profile for the section of sewer pipeline;
- obtaining a hydrogen sulfide profile for the section of sewer pipeline by monitoring hydrogen sulfide detection at the second end of the section of sewer pipeline;
- using the wastewater flow rate profile and the hydrogen sulfide profile, obtaining a first instant flow rate below which hydrogen sulfide is detected at the second end, a second instant flow rate above which hydrogen sulfide is no longer detected at the second end, and a low flow rate period having a start time corresponding to the first instant flow rate and an end time corresponding to the second instant flow rate;
- determining a wastewater detention time in the section of sewer pipeline during the low flow rate period;
- initiating a feed of wastewater treatment chemical at the first end of the section of sewer pipeline at a time equal to the start time minus the detention time;
- and
- discontinuing the feed of wastewater treatment chemical at the first end of the section of sewer pipeline at a time equal to the end time minus the detention time.
A method of regulating the feed of wastewater treatment chemical in a section of sewer pipeline having a first and a second end, comprising the steps of:
- obtaining a wastewater flow rate profile for the section of sewer pipeline;
- obtaining a dissolved oxygen profile for the section of sewer pipeline by monitoring dissolved oxygen detection at the second end of the section of sewer pipeline;
- using the wastewater flow rate profile and the dissolved oxygen profile, obtaining a first instant flow rate below which dissolved oxygen is not detected at the second end, a second instant flow rate above which dissolved oxygen is detected at the second end, and a low flow rate period having a start time corresponding to the first instant flow rate and an end time corresponding to the second instant flow rate;
- determining a wastewater detention time in the section of sewer pipeline during the low flow rate period;
- initiating a feed of wastewater treatment chemical at the first end of the section of sewer pipeline at a time equal to the start time minus the detention time;
- and
- discontinuing the feed of wastewater treatment chemical at the first end of the section of sewer pipeline at a time equal to the end time minus the detention time.
Dependencies are inferred from the claim text.