Question

The primary treatment methods in meat industry effluent treatments reduce _______

• A. Fat upto 70%, susepended solids upto 25% and BOD upto 10%
• B. Fat upto 50%, susepended solids upto 95% and BOD upto 65%
• C. Fat upto 90%, susepended solids upto 65% and BOD upto 35%
• D. Fat upto 80%, susepended solids upto 45% and BOD upto 55%

Hint:

Primary treatment is essential to protect downstream biological treatment systems (like activated sludge) from being coated with fat, which would inhibit oxygen transfer.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Effluent treatment in the meat processing industry involves physical, chemical, and biological processes to clean wastewater before discharge.
Primary treatment focuses on the physical removal of floating solids, grease, and suspended materials.

Step 2: Detailed Explanation:
Wastewater from slaughterhouses and meat processing plants contains high concentrations of fats, oil, grease (FOG), and suspended solids.
Primary treatment methods (such as screening, grit chambers, fat traps, and dissolved air flotation) physically separate these insoluble materials.
A well-designed primary treatment system can remove up to \(90\%\) of free fats, about \(65\%\) of suspended solids, and reduce the biochemical oxygen demand (BOD) by approximately \(35\%\) due to the removal of organic solids.

Step 3: Final Answer:
Therefore, primary treatment reduces fat up to \(90\%\), suspended solids up to \(65\%\), and BOD up to \(35\%\).