Integrating recycle stream ammonia treatment with biological nutrient removal
First Claim
1. A method of removing ammonia from a stream, comprising:
- separating a nitrogen containing stream into a first solids-depleted stream and a first solids-rich stream;
treating the first solids-rich stream with anaerobic digestion to produce an ammonium containing treated solids-rich stream;
separating the treated solids-rich stream into a second solids-rich stream and an ammonium containing second solids-depleted stream;
using an ammonia recovery process for removing the ammonia from the second solids-depleted stream, comprising;
adding a sufficient amount of one or more bases to the second solids-depleted stream to convert the ammonium to ammonia and the bicarbonate to carbonate, andtransforming the ammonia into the vapor phase and subsequently collecting the ammonia in a liquid stream using one or more vapor removal devices, thereby separating the liquid ammonia stream from a return stream;
conducting a biological process to remove ammonia from the first solids-depleted stream, the biological process comprising a nitrification process; and
flowing the return stream into the biological process.
0 Assignments
0 Petitions
Accused Products
Abstract
Embodiments include a method and apparatus for recovering ammonia and nitrogen from a waste stream. Embodiments further include recovering ammonia using an ammonia recovery process and a biological nitrogen recovery process. In some embodiments, a return stream from the ammonia recovery process may be used to provide alkalinity, carbon substrate, and/or biological oxygen demand to the biological nitrogen recovery process. In some embodiments, a hydrothermal sludge process may be used to further treat the waste stream and provide additional return to the ammonia recovery system. Other embodiments include an ammonia recovery system for conducting the ammonia recovery process, a biological nitrification and/or denitrification system for conducting the biological nitrogen recovery process, and an optional hydrothermal sludge processing system.
111 Citations
27 Claims
-
1. A method of removing ammonia from a stream, comprising:
-
separating a nitrogen containing stream into a first solids-depleted stream and a first solids-rich stream; treating the first solids-rich stream with anaerobic digestion to produce an ammonium containing treated solids-rich stream; separating the treated solids-rich stream into a second solids-rich stream and an ammonium containing second solids-depleted stream; using an ammonia recovery process for removing the ammonia from the second solids-depleted stream, comprising; adding a sufficient amount of one or more bases to the second solids-depleted stream to convert the ammonium to ammonia and the bicarbonate to carbonate, and transforming the ammonia into the vapor phase and subsequently collecting the ammonia in a liquid stream using one or more vapor removal devices, thereby separating the liquid ammonia stream from a return stream; conducting a biological process to remove ammonia from the first solids-depleted stream, the biological process comprising a nitrification process; and flowing the return stream into the biological process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. An apparatus for removing ammonia from a waste stream, comprising:
-
one or more separating devices for separating an anaerobically digested waste stream into a solids-rich stream and a solids-depleted stream; an ammonia recovery system for recovering ammonia from the solids-depleted stream, comprising; a base source for adding one or more bases to the solids-depleted stream, and one or more vapor removal devices for transforming ammonia in the solids-depleted stream into the vapor phase and subsequently collecting the ammonia in a liquid stream, thereby forming the ammonia liquid stream and a return stream; and a biological ammonia removal system to remove ammonia from the solids-depleted stream, the biological ammonia removal system comprising a nitrification system, wherein the return stream is flowable through a return pathway from the ammonia recovery system to the biological ammonia removal system. - View Dependent Claims (21, 22, 23, 24, 25, 26)
-
-
27. A method of removing ammonia from a stream, comprising:
-
separating a nitrogen containing stream into a first solids-depleted stream and a first solids-rich stream; treating the first solids-rich stream with a hydrothermal process to produce an ammonium containing treated solids-rich stream; separating the treated solids-rich stream into a second solids-rich stream and an ammonium containing second solids-depleted stream; using an ammonia recovery process for removing the ammonia from the second solids-depleted stream, comprising; adding a sufficient amount of one or more bases to the second solids-depleted stream to convert the ammonium to ammonia and the bicarbonate to carbonate, and transforming the ammonia into the vapor phase and subsequently collecting the ammonia in a liquid stream using one or more vapor removal devices, thereby separating the liquid ammonia stream from a return stream; conducting a biological process to remove ammonia from the first solids-depleted stream, the biological process comprising a nitrification process; and flowing the return stream into the biological process.
-
Specification