猪废物处理过程中重金属的发生和转化:一项全面的研究
Wancen Liu1, Dingge Cao1, Yongfang Wang1
1Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
The Science of the total environment
|June 19, 2023
概括
这项研究追踪了猪废物处理中的重金属,发现虽然水溶性金属减少了,但它们转移到生物固体中. 农业肥料使用需要有效的被动化策略.
科学领域:
- 环境科学 环境科学
- 农业工程 农业工程
- 生物技术是生物技术.
背景情况:
- 工业养猪场会产生大量含有重金属的废物.
- 综合废物处理系统旨在减轻环境风险.
- 了解重金属的转化对于可持续的废物管理至关重要.
研究的目的:
- 通过一个集成的猪废物处理系统,追踪九种重金属的命运和转化.
- 评估不同处理单元中水溶性重金属的去除效率.
- 评估生物固体中的重金属的固定和环境风险.
主要方法:
- 追踪九种重金属 (Fe,Zn,Cu,Mn,Ni,Cr等) 的存在. 在一个猪废物处理系统中.
- 在无氧稳定,无氧消化和无氧-氧 (A/O) 单元中分析水溶性重金属的去除.
- 在固体 (生物固体) 阶段量化重金属被动化率.
主要成果:
- 铁,,和是猪原始废物中最为丰富的重金属.
- 在水中溶解的重金属去除效率为30% (无毒稳定),24% (无氧消化) 和42% (A/O).
- 无氧稳定有效地去除了Cu,Mn和Ni; A/O单元在去除Fe,Cr和Zn方面表现出色.
- 重金属优先从液体转移到生物固体,其被动化率为42-70%.
结论:
- 综合处理系统减少了用于灌的液体废水对环境的风险.
- 生物固体中的重金属在用作农业肥料时存在风险,需要改进被动化.
- 需要进行进一步的研究,以制定有效的重金属被动化策略,用于处理猪废物,特别是在堆肥过程中.
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