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

Active packaging is a significant advancement in food technology that enhances food quality, safety, and shelf life by interacting with the contents or the surrounding environment. Unlike passive packaging, which only serves as a barrier, active packaging can release or absorb substances into or from the packaged food or headspace. Here are five examples of active packaging used in the food industry:

1. Oxygen Scavengers: These are used to absorb residual oxygen inside the packaging, which helps in preventing oxidation reactions in food. Oxygen scavengers typically contain iron powder or ascorbic acid, which reacts with oxygen to form stable oxides. This is especially useful for packaging oxygen-sensitive foods like meat, nuts, bakery products, and powdered milk, as it helps to delay rancidity and microbial spoilage.

2. Moisture Absorbers: Moisture can lead to microbial growth, spoilage, and textural changes in foods. Moisture-absorbing sachets or pads are often incorporated into packages of dried foods, snacks, and meats. These ___ _________ _________ __________ _________ ___ ____ ________ ____ ____ ________.
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