US 9,255,022 B2Granted

Biological-chemical treatment of liquid organic wastewater

AssigneeInfilco Degremont Inc.

InventorsSunil Mehta, Nabin Chowdhury, Richard Ubaldi, Barbara Schilling, Antonio Lau, Bruno Heiniger

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Abstract

The invention is directed to systems and methods of biological and chemical treatment of wastewater comprising organic nitrogen compounds. Systems may include: an aerobic reactor, a first separation module for separating liquid and solid components of the wastewater; an oxidation module for removing organic materials from the wastewater; and a post-anoxic reactor for denitrifying at least a portion of the wastewater. Systems may include a second separation module and various feedback recycle lines between the components. Methods may include: degrading by the aerobic reactor more than 95% of organic compounds to ammonia, oxidizing by the oxidation module at least a portion of the ammonia to nitrates, and degrading by the post-anoxic reactor at least a portion of the nitrates to nitrogen gas and water. Systems and methods may reduce total organic carbon of the wastewater by more than 90%, and total nitrogen of the wastewater by more than 90%.

Claims25

Dependent claims

A biological and chemical treatment system for treating wastewater comprising liquid organic wastes and toxic chemicals generated from the production of thin film transistor liquid crystal displays, the wastewater comprising tetra-methyl ammonium hydroxide ((CH3)4NOH, “TMAH”), the system comprising:

an aerobic reactor, receiving an influent comprising wastewater to be treated, configured to cause the degradation of at least 90% of the TMAH in the influent to NH4—N (“ammonia”);
a first separation module in series with the aerobic reactor, the first separation module receiving the output of the aerobic reactor as an input, the first separation module separating liquid and solid components of the wastewater;
an oxidation module in series with the first separation module, the oxidation module receiving the output of the first separation module as an input, the oxidation module nitrifying any free ammonia and removing organic materials from the wastewater using an advanced oxidation process system that utilizes inputs of ozone (O3) and hydrogen peroxide (H2O2) to oxidize the wastewater received from the first separation module;
and
a post-anoxic reactor in series with the oxidation module, the post-anoxic reactor receiving the output of the oxidation module as an input, the post-anoxic reactor denitrifying at least a portion of the wastewater, and outputting an effluent;
wherein the effluent has a reduction of total organic carbon (“TOC”) and total nitrogen (“TN”) of more of more than 90% compared with the influent.

3 more elements

A biological and chemical treatment method for treating wastewater comprising liquid organic wastes and toxic chemicals generated from the production of thin film transistor liquid crystal displays, the wastewater comprising tetra-methyl ammonium hydroxide ((CH3)4NOH, “TMAH”), comprising:

receiving an influent comprising wastewater to be treated in an aerobic reactor;
biologically treating the influent to convert and degrade the any nitrogen compounds in the organic wastes, and causing more than 99% of the TMAH to degrade ammonia;
receiving at a first separation module from the aerobic reactor an output of the aerobic reactor, the first separation module comprising a membrane bioreactor that separates the liquid and solid components of the wastewater by microfiltration or ultrafiltration;
separating any solid components of the wastewater by the first separation module;
receiving at an advanced oxidation process system from the first separation module an output of the first separation module, the advanced oxidation process system removing organic materials by treating the output of the first separation module with ozone (O3), and hydrogen peroxide (H2O2), the advanced oxidation process system causes a substantially complete oxidation of ammonia to NO3—N (“nitrates”);
removing organic materials from the wastewater by the oxidation module;
receiving at a post-anoxic reactor from the oxidation module an output of the oxidation module;
and
denitrifying at least a portion of the wastewater by the post-anoxic reactor, and outputting an effluent,
wherein the effluent has a reduction of total organic carbon (“TOC”) and total nitrogen (“TN”) of more of more than 90% compared with the influent.

7 more elements

Dependencies are inferred from the claim text.