ONSITE TREATMENT. Amphidrome

Transcription

1 ONSITE TREATMENT Amphidrome

2 Agenda System Description Installation Locations Performance Questions

3 Definition in Oceanography Amphidrome The position in the ocean where the tide vanishes to zero

4 Definition in Wastewater Amphidrome A submerged attached-growth bioreactor (SAGB) in which the nitrogen vanishes to nearly zero

5 Amphidrome Process Description Biological Nutrient Removal (BNR) Process TSS BOD 5 Total Nitrogen Oil and Grease One Reactor A submerged attached growth bioreactor (SAGB) operating in sequencing batch mode SAGB is also commonly referred to as a BAF (biological aerated filter).

6 System Consists Of 2 Tanks And 1 Reactor Anoxic / Equalization Tank Amphidrome tm Reactor Clear Well Tank Waste Water Anoxic / Equalization Tank Reactor Clear Well Treated Water

7 Anoxic/Equalization Tank Solids settling Sludge storage Secondary functions Buffers the dissolved oxygen in the recycled flow Mixes recycle with influent organic carbon to promote de-nitrification

8 Main Reactor Function Media provides the surface area for biofilm growth Provides solids separation, eliminating the need for downstream clarification Intermittent aeration Typically 3 minutes on 15 minutes off

9 Clearwell Function Stores batch volume Stores some fraction of backwash volume Contains backwash and effluent pumps (or Plus feed pumps)

10 Controls Control Panel Touch Screen Remote Access Operator Can tune the system

11 Amphidrome System Benefits Highest Level of Nitrogen Removal of any system available Low Visual Impact Not affected by air temperature as are trickling filters All effluent filtered through deep sand bed to protect SAS

12 Installation

13 Reactor Clear Well Three-tank system Anoxic

14 NANTUCKET, MASSACUSETTS SINGLE FAMILY HOME REACTOR COVERS

15 MEADOWS AT MAINSTONE BELOW GRADE SYSTEM

16 OCEAN EDGE CONFERENCE CENTER REACTOR COVERS

17 OCEAN EDGE CONFERENCE CENTER BELOW GRADE SYSTEM

18 HEALTH CARE FACILITY REACTOR COVERS

19 Where can you find us? New England Pennsylvania North Carolina Maryland Minnesota Internationally

20 Performance Plant: Location: Design Flow: Pleasant Bay Nursing Home Brewster, MA 26,500 gpd BOD5 TSS Total N Permit Limit 30 mg/l 30 mg/l 10 mg/l Average 5.07 mg/l 6.3 mg/l 4.79 mg/l

21 Performance Plant: Location: Design Flow: Daniel Hand High School Madison, CT 25,000 gpd BIOCHEMICAL OXYGEN DEMAND TOTAL SUSPENDED SOLIDS TOTAL NITROGEN INFLUENT 174 mg./l. 137 mg./l. 90 mg./l. EFFLUENT 9.5 mg./l. 8.2 mg./l. 6.8 mg./l. PERMIT LIMIT 30 mg./l. 30 mg./l. 10 mg./l.

22 Performance Plant: Location: Design Flow: Chili s Resturant Hingham, MA 7,670 gpd BOD5 TSS Total N Permit Limit 30 mg/l 30 mg/l 25 mg/l Average 4.9 mg/l 8.2 mg/l 5.4 mg/l

23 Performance Plant: Location: Design Flow: Traditions Condos Wayland, MA 10,320 gpd Traditions (Condominium) DEP Permit # Effluent Total N (mg/l) Total N (mg/l) Discharge Limit 0 Nov-01 May-02 Dec-02 Jun-03 Jan-04 Aug-04 Feb-05 Sep-05 Mar-06 Date of Sample BIOCHEMICAL OXYGEN DEMAND TOTAL SUSPENDED SOLIDS TOTAL NITROGEN PERMIT LIMIT 30 mg./l. 30 mg./l. 19 mg./l. EFFLUENT mg./l mg./l mg./l.

24 Questions

25 Amphidrome

26 Process Chemistry Biochemical Transformations CH 2 O O NH HCO C 5 H 7 O 2 N CO H 2 O (aerobic) NH O HCO C 5 H 7 O 2 N NO H 2 O H 2 CO 3 (aerobic) NO C 10 H 19 O 3 N N CO H 2 O NH OH - (anoxic)

27 BNR - Process Chemistry Oxidation of Carbonaceous BOD: Oxidation: COH + O 2 + Bacteria CO 2 + other end products + energy organic matter Cell Synthesis: COHNS + O 2 + Bacteria + energy C 5 H 7 NO 2 organic matter new bacterial cells Endogenous Respiration C 5 H 7 NO O 2 5 CO 2 + NH H 2 O + energy -

28 Process Chemistry Oxidation of Nitrogen Based Compounds NH /2 O 2 NO H + + H 2 O Nitrosomonas Bacteria ammonium nitrite NO /2 O 2 NO - 3 Nitrobacter nitrite nitrate Overall Energy Reaction: NH O 2 NO H + + H 2 O ammonium nitrate

29 Process Chemistry - Continued Reduction of Nitrite & Nitrate: The nitrate reducing bacteria are facultative anaerobic heterotophs. Therefore, an organic carbon source is required. For the following equations methanol has been used as the carbon source. First Energy Reaction: 6 NO CH 3 OH 6 NO CO H 2 O nitrate methanol nitrite Second Energy Reaction: 6 NO CH 3 OH 3 N CO H 2 O + 6 OH - nitrite methanol nitrogen gas

30 Process Chemistry - Continued Heterotrophic Cell Synthesis: 3 NO CH 3 OH + CO H + 3 C 5 H 7 O 2 N + H 2 O nitrate methanol Biomass Overall Nitrate Removal NO CH 3 OH + 3 H C 5 H 7 O 2 N N CO 2 + H 2 O nitrate methanol Biomass