The antonyms for the phrase "placed disposal" can be numerous, depending on the context. In general, the opposite of placing something in disposal would be to retrieve or remove it. Instead of throwing something away, one might want to store or save it. Other antonyms might include keeping, holding, or preserving. In a more specific sense, the antonyms would depend on the type of disposal in question. For example, for hazardous waste disposal, the opposite might be to recycle or reuse the material. For food waste, composting or donating to food banks might be the opposite of placing it in disposal.