Anaerobic Digester Diagnostic Form

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Company Name:

Industry Type:  
 If several lagoons or tanks in system, identify which one this form is for:

 Lagoon name

(example: "1 of 4 in a row")

Your E-mail:

(person who wants reply)



 Telephone Number:  
 Client contact: (Name & title)
 AM Distributor  

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System Description

Primary Treatment System:


Describe System: waste pit lagoon

If more than one waste pit or lagoon, how many?

1. Total volume: Million Gallons


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

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

3. Daily influent flow: Millions of Gallons per Day

4. Influent pH: typical (range: to)

...............Temperature: typicalF (range:to) F

5. Effluent pH: typical (range: to )

...............Temperature: typical F (range: to ) F

6. Other Parameters:

Identify the units used answering the following questions: lbs/day mg/L


 Influent Average


Effluent Average 

 Oil & Grease        
 Total Solids        
 Volatile Solids        



 C/N Ratio        

7. Is there any pretreatment of this material? If so, please describe:

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Secondary Treatment System

1. Type & Qty:

Is system above ground? Yes No


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

Total Capacity: Million Gallons 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 CSRT, continuously stirred tank reactor)

3. Throughput:: CFM biogas production potential

% methane % carbon

4. Average Temperature:F

Is temperature controlled by heating system? Yes No

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? YesNo

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



Volatile Acids: 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? Yes No

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 rateMillion Gallons A Day

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Tertiary System

1. Tank or lagoon: Shape:

...............Is tank/lagoon covered? Yes No

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

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



Volume of cone:

Is vol. of cone included in capacity? Yes No

Is cone agitated? Yes No

Is discharge port above or in cone?


3. Type and Qty of Aerators:

(Floating or Fixed )

Dimensions measured in feet: (length x width x depth)

Diffused Aeration:

(Qty & Horsepower)

4. Other influent parameters (in ppm):

 COD: ppm

 COD: ppm



DO: ppm


Phenol: ppm



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:

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Chemical/Biological Treatment



 Ammonia addition    
 Phosphate addition    
 Antifoam addition    
 Biological addition    

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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 treatmentft.

 Inside diameter of pipe: in.

Pipe material:

Pump or gravity fed

Volume recirculated: to

How often?:

2. Distance from primary system to digesterft.

 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 is waste recirculated back to digester?:

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 is waste recirculated back to primary?:

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?)



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).

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Current Effluent Limits: (NPDES) or Targets

NPDES -or- Target Process Limits




mg/L lbs./day

mg/L lbs./day
 COD mg/L lbs./day mg/L lbs./day
 TSS mg/L mg/L
 DO mg/L mg/L
 Phosphorus mg/L mg/L

 Fecal coliform -

count/100 ml

 Ammonia-nitrogen mg/L mg/L
 Ammonia-nitrate mg/L mg/L
 Heavy metals (name in the 4 blocks below)
mg/L  mg/L
mg/L mg/L
mg/L mg/L
mg/L mg/L

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Flow Diagram

You may submit a diagram by FAX at 540-636-1770 or give us a word flow chart below

Example: raw waste pump station --> pond 1 (aerated, lined) --> ponds 2, 3 ,4, & 5 (settling and unlined) --> sludge holding pond


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We usually add all people who inquire about our products to our newsletter mailing list, which is kept for in-house use. We do not ever sell or trade names of our clients, and rarely contact by e-mail more than once a month.

Mailing list: YES NO

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