Which of the following is a characteristic of wastes produced by a cannery?

Wastes produced by a cannery typically contain a high concentration of dissolved organic matter. This is primarily due to the nature of the food processing industry, which generates significant amounts of organic materials such as fruit and vegetable residues, natural juices, and other biological components during the canning process. The breakdown of these materials releases organic compounds into the wastewater, resulting in higher levels of dissolved organic matter.

This characteristic can have implications for wastewater treatment, as high levels of organic matter can lead to increased biochemical oxygen demand (BOD), which can impact aquatic ecosystems if not managed properly. The presence of such organic waste is a significant concern for environmental compliance and necessitates proper treatment methods to minimize the environmental impact.

In contrast, the characteristics such as low dissolved organic matter, high solid waste content, and low water usage do not accurately reflect the nature of cannery waste, as the focus is on the liquid waste which is rich in dissolved organic molecules, making the correct choice clear.