用固定剂减少污泥中重金属污染土壤的研究

该研究将加有重金属固定剂的污泥装入废弃塑料容器制成施肥器，利用人工淋水或自然降水，使污泥中的养分从施肥器中流入土壤，而重金属被固定在污泥中，减少重金属土壤污染，再收集处理残渣，防止二次污染。通过淋滤试验和种植油麦菜、蕹菜的盆栽试验得出以下结论：硫酸钾作为固定剂和污泥混合，不仅肥效好，作物产量高，而且污泥重金属被水淋出量少，植物体内重金属的含量低。该文为污泥合理农用提供了新方法，同时充分利用了废弃塑料容器等废弃物，成本低而收效显著。

Fixing heavy metals in sludge and reducing pollution to soil using heavy metal stabilizers

The heavy metal stabilizers were added to sludge contained in used plastic containers, through artificially watering or naturally rain falling, the fertilizer components flowed out with leaching water and fertilized plants but the heavy metals retained in the sludge within container. The leaching experiments and the pot experiments with Laetuca satiuali and Ipomoea aquatic showed that the positive effects of the mixture of the sludge and K₂SO₄ on plant production and reduction of heavy metal contents in plants were significant. Metals-bound sludge could be collected easily after treatment to prevent the secondary pollution, provided that the heavy metals were fixed within the container and reduced obviously the leaching of heavy metals to soil. This equipment meets requirements of safe agricultural utilization of the sludge. Besides, this method permits the plastic waste recycled and realized with a low cost.