Sewage sludge, the solid that remains after aerobic decomposition, makes a useful fertilizer because

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Sewage sludge contains high levels of nitrogen, phosphorus, and potassium, making it a valuable fertilizer for plants. These nutrients are essential for plant growth and development, and sewage sludge can help to replenish soil nutrients that have been depleted over time. Additionally, sewage sludge can improve soil texture, water retention, and overall soil health, making it an effective and sustainable alternative to traditional fertilizers.

Sewage Sludge, the Solid That Remains After Aerobic Decomposition, Makes