Give five examples of active packaging used in food. Explain secondary treatment of liquid wastes in a food processing plant.

Active packaging is an innovative approach in food packaging that interacts with the food or its environment to extend shelf life, maintain quality, and enhance safety. It involves materials or components that actively release or absorb substances, thus influencing the condition of the packaged food. Here are five examples of active packaging used in food:

1. Oxygen Absorbers: These are small sachets or films containing iron powder that reacts with oxygen to remove it from the package atmosphere. Oxygen absorbers prevent oxidation of food, which can cause spoilage, discoloration, and rancidity, especially in products like dried fruits, nuts, and meat.

2. Moisture Absorbers: Silica gel or clay-based packets are used inside packaging to absorb excess moisture. Controlling humidity ________ __________ __________ __________ _______.
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