Then, the soil can be fertilized using recycled biological waste.

然后，可以使用回收的生物废物对土壤进行施肥。

It has soaps, oils, chemicals, biological waste and food scraps in it and by law it has to be treated.

它里面有肥皂，油，化学药品，生物废料和食物残渣，而且根据法律它必须被处理。