Anaerobic Digester System Evaluation


Date Contacted: _____________



Client: ___________________________ Phone:________________________

Address: _______________________ FAX: ___________________________

___________________________________ E-mail:______________________

___________________________________ Website: ____________________

Contacts: _______________________________________________________

_______________________________________________________

(Name) (Title)

_______________________________________________________

(Name) (Title)


Industry type (Products manufactured): _______________________________________________________ 


System Description


Primary System:

source of digester influent, (waste pit, lagoon, etc.)

1. Total volume __________ MGals.


2. Dimensions: ________ ft. x ________ ft. x ________ ft. (length x width x depth)


-or- ________ ft. x ________ ft. (diameter x depth)


3. Daily influent flow:__________ MGals./Day


4. Influent pH: typical _____ (range: ____ to ____)

...............Temperature: typical____F (range:___to____)F


5. Effluent pH: typical _____ (range: ____ to ____)

...............Temperature: typical ____F (range:____ to____)


6. Other Influent Parameters (measured in ppm)

Oil/Grease/Fat:_______

H2S:_________

BOD:_______ppm (____x COD) Dissolved Sulfide:________

COD:_______ppm ( x V.S.) NH3N:________

TS (total solids)___%Vol. ______ppm

o-PO4:_______

VS (volatile solids):___%TS _______ppm

DO*:_______

SO4:__________ NaCl:________

Nitrate:____________ Copper:_______

Chromium:_________ Nickel:________

Sodium:_______ Potassium:________

Calcium:________ Magnesium:_______

Manganese:_________ Alkalinity:________

C/N Ratio:_________

*DO for pre-treatment of anaerobic waste should be as low as possible

 

7. Is there any pre-treatment of this material? If so, please describe:___________________________________________________

___________________________________________________________

___________________________________________________________


Alken® prescription for primary system: __________________________________________________________

__________________________________________________________

__________________________________________________________


Secondary System

1. Type & Quantity:__________________________________________

...............Material: _________________

Above ground or in:_______________________________________


2. Volume/Dimensions/Shape of Digester(s):

Total Capacity:______________________MGal Actual

Number of Digester Units:______

Digester Dimensions:________ ft. x ________ ft. x ________ ft.

(length x width x depth)

Slope of digesters:____________

How stirred or mixed:_____________________________________________

(example CSTR, continuously stirred tank reactor)


3. Throughput:____CFM biogas production potential

...............______% methane ______% carbon


4. Average Temperature:_____F ±_______F

...............Is temperature controlled by heating system?______

Insulation type:___________________________________________


5. Functioning System pH:________ to _________


6. Is system batch or continuous feed:____________Feed Stock: ___________________

...............Organic loading rate:________________

How often is batch fed: _______________


7. Is there an attached film anaerobic filter in the reactor?____________________________


8. Hydraulic Retention Time:______ days


9. Mean Cell Retention Time:______ days


10. Food to Mass Ratio:______ ppm (Food ÷ Mass)


11. Monitoring Criteria - Averages:

 COD:______ ppm

H2S:______ ppm

NH3N:______ ppm

Volatile Acids:_____ ppm

Alkalinity:____ ppm


12. Effluent port type:

Inside diameter of pipe:_____ inches Pipe material:__________

Gravity or Motorized:_____________


13. If treatment requested is for plant start-up:

Is initial reactor volume introduced from the primary waste source________

If not, source of initial loading?_________________________________________

Number of gallons placed in the reactor for initial load?____________

How long is digester being heated before treatment, operation?__________

Number of gallons of influent per batch at start-up________

What parameters will be used to determine influent increase?____________

______________________________________________________________________

______________________________________________________________________

Rate of influent increase_____________ Target influent rate___________MGD  

Tertiary System


1. Tank or lagoon:______________ Shape:_________________

...............Is tank/lagoon covered?_____________


2. Dimensions: ________ ft. x ________ ft. x ________ ft. (length x width x depth)

-or- ________ ft. x ________ ft. (diameter x depth)

Capacity:_____________________

Materials:___________________________________

Volume of cone: ______________ Is vol. of cone included in capacity?___________

Is cone agitated?______________ Is discharge port above or in cone?____________ 

 


3. Type and Qty of Aerators:_____________________________________________________________

(Floating or Fixed)

 

Diffused Aeration:______________________________________________________________

(Qty & HP)


4. Other influent parameters (in ppm):

 BOD:_________ppm DO:_________ppm

COD:_________ppm Phenol:______ppm

o-PO4:________ppm NH3N:_______ppm

Detergents/surfactants:__________________________________________

Other sanitizers:________________Chemical formula__________________

 


5. Desired Reductions in Tertiary System:

 Phosphorus removal: (Chemical precip.)_____________________mg/L

Ammonia removal: (nitrification)__________________________mg/L

Nitrate removal: (denitrification)___________________________mg/L

Other outcomes: ____________________________________________________

Chemical/Biological Treatment

Product Dosage Application Point

Ammonia addition ______________ ______________ _______________

Phosphate addition ______________ ______________ _______________

Antifoam addition ______________ ______________ _______________

Biological treatments:

_________________ ______________ ______________ _______________

_________________ ______________ ______________ _______________

_________________ ______________ ______________ _______________


 Alken® prescription for digester(s):____________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

____________________________________________________________

Alken® prescription for tertiary lagoon/tank (s):____________________________________________________

______________________________________________________

______________________________________________________


 System Communication and Material Handling

Note: waste source is waste collection; digester is secondary system,unless otherwise specified


1. Distance from waste source to primary treatment__________ ft.

 Inside diameter of pipe:_____ in. Pipe material:___________ Pump or gravity fed:________

Volume recirculated:__________ to _______________ How often?:_________________________

2. Distance from primary system to digester___________ ft.

 Inside diameter of pipe:_____ in. Pipe material:___________ Pump or gravity fed:__________

Volume recirculated:__________ to _______________ How often?:_________________________

3. Distance from digester to tertiary treatment___________ ft.

 Inside diameter of pipe:_____ in. Pipe material:___________ Pump or gravity fed:__________

Volume recirculated:__________ to _______________ How often?:_________________________

4. Distance from tertiary treatment to waste source (if applicable) _______ ft.

Inside diameter of pipe:_____ in. Pipe material:___________ Pump or gravity fed:__________

Volume recirculated:__________ to _______________ How often?:_________________________


Other considerations: (ie use of trenches instead of pipes: ____________________________________________

Describe any other chemicals used including sanitizers and cleaners:

(herbicides used around lagoons; odor masking agents; pesticides used in animal confinement areas; antibioticsin feed or water)

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________


Describe other process inputs or circumstances that may affect this process:

(sources of water, ie. ponds, lakes, wells; on-site treatment of water)

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________



Objectives and General Questions



What is the objective of an Alken Clear-Flo® program?

(improved recovery, system stability, nitrification, improved startup, sulfide control, improved organic removal, etc.)


__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________


What criteria would determine the success of the program? Time frame?


__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________


What are the justifications for an Alken Clear-Flo® program? (reduced operating costs, reducing environmentally related complaints, compliance, avoiding fines, etc.)



__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________


If necessary, can system improvements be effected? (such as waste dilution, process control changes, nutrient amendment.


__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________


What alternative treatment options are being considered? Have bacterial treatment

products been used in the

past or presently? (Brand, formula designation and dosage?)


___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

Remember:

1) Maintain ratio of BOD/Ammonia/Orthophosphate in digester influent equal to 100/6/3.
2) Maintain C/N ratio of digester influent at around 20.
3) Maintain digester temperature between 25 to 35C (77 to 95F). Within range, higher equals faster. Clear-Flo® 7020 works between 40 and 100F.
4) When degrading hydrogen sulfide, maintain 100 ppm of sodium nitrate, to prevent formation of sulfuric acid.
5) Add aeration to tertiary lagoon for nitrification to be effective. Do NOT add aeration to either the primary lagoon or the reactor, under any circumstances !
6) Monitor system elements carefully. Adjust dosages based upon performance!
Monitor volatile acids: alkalinity. If this ratio rises above 0.1, implement process controls to increase alkalinity (temperature, wasting level, etc. to reduce it).

 Current Effluent Limits: (NPDES) or Targets

Please state whether using NPDES limits -OR- target process limits ___________________

pH __________

BOD ___________mg/L lbs./day

COD ___________mg/L lbs./day

TSS ___________mg/L

D. O. ___________mg/L

Heavy metals ___________mg/L

__________ ___________mg/L

__________ ___________mg/L

Fecal coliform ___________count/100ml

Ammonia-nitrogen ___________mg/L

Ammonia-nitrate ___________mg/L

Phosphorus ___________mg/L

OTHER ___________ units________



System Flow Diagram

Draw a diagram of the system flow below: