The sewage sludges are the solid materials remaining after the treatment of sewage.The sewage sludges can be used as amendments on crop land.

• 当前，污水处理后的各种淤渣越来越多，如何最终处理这些淤渣已成为当代社会的又一课题，其中一个重要途径是施于农田等农业土壤作肥料。