Nevertheless, I can discuss a general approach to estimating these quantities
based on known factors:

1. Quantity of palm nut: Determine the known weight or volume of palm nut
   available for processing in tons.
2. Palm Oil Mill Effluent (POME) production: Typically, for every ton of fresh palm
   fruit processed, about 50% weight (yield ratio) ends up as POME after oil and
   kernel extraction from the nuts. Calculate the quantity of POME by multiplying
   the weight of palm nut with the yield ratio (50% or 0.5).
3. Biogas production: The generation of biogas from POME can vary based on
   biogas production efficiency in the CSTR system. Without efficiency data, it is
   difficult to determine the precise biogas yield. Generally, biogas estimates range
   from 0.2 to 0.4 cubic meters per kilogram (m³/kg) of COD (Chemical Oxygen
   Demand) reduction in the anaerobic digestion process.
   To calculate the potential biogas production given POME composition
   concentrations:
   a. Determine COD levels: Obtain relevant POME samples and measure the COD
   in kilograms.
   b. Estimate biogas production: Assume an average yield (e.g., 0.3 m³/kg COD).
   c. Calculate total biogas: Multiply estimated biogas production per kg of COD by the total COD content in POME (in kg).
4. Quantity of fertilizer: POME contains valuable nutrients like nitrogen,
   phosphorus, and potassium, which makes it beneficial for land application as
   fertilizers. However, the specific fertilizer quantity obtained depends on the
   effluent's concentration and fertilization rate decided based on soil analysis,
   target crop requirements, and local regulations. Determine/conduct POME analysis to know the elemental composition (e.g., %N, %P, and %K), conduct a soil test to obtain nutrient availability data, and determine target concentrations or application rates designated by agriculture experts or regulatory bodies. Then, using these values, calculate the precise quantity of fertilizer obtainable. Although this explanation outlines the general methodology, you'll need definite values for various factors including input/output composition, process efficiency/makeup, operational details, and other relevant information to arrive at specific calculations.