CUIChao,XIONG Jian-jun,ZHANG Rong-bing,et al.Discussion and Thinking on Land Use of Sludge Products Based on Nitrogen and Phosphorus Supply and Demand Balance Method[J].China Water & Wastewater,2025,41(8):40-46.
基于氮磷供需平衡法的污泥产品土地利用探讨及思考
- Title:
- Discussion and Thinking on Land Use of Sludge Products Based on Nitrogen and Phosphorus Supply and Demand Balance Method
- Keywords:
- sludge product; land use; supply and demand balance method of nitrogen and phosphorus; maximum safe application amounts
- 摘要:
- 对标分析了北京中心城区污泥产品土地利用的适用性，探讨了基于实测和经验值两种氮磷供需平衡法的适用性及最大安全施用量，以期为国内污泥土地利用相关规范性文件的修订或出台提供借鉴。研究结果显示：①污泥产品质量满足现行林地、园林绿化等国际及行业标准要求，标准推荐用量均在环境容量范围内，但现行标准只有最大推荐用量，均未提出推荐用量内最大安全施用量的核算方法。②实测氮磷供需平衡法较经验值法能更客观地从目标植物氮磷需求、土壤氮磷养分供给、污泥产品氮磷释放能力三方面科学核算污泥产品最大安全施用量，其结果准确性和合理性更高。③应结合现行污泥产品土地利用标准，根据目标场景中常见植物种类的氮磷需肥规律，总结以产量追求和以景观效应追求为目的两类目标导向下不同植物年氮磷需求量参数表，研究污泥产品氮磷释放速率及利用率，结合土壤肥力质量条件，依据氮磷供需平衡方法学，确定目标利用场景下标准推荐用量范围内的最大安全施用量。
- Abstract:
- This paper analyzed the land utilization of sludge products in the central city of Beijing by standard comparison，discussed the applicability and maximum safe application amounts of two methods of nitrogen and phosphorus supply and demand balance based on measured and empirical values, in order to provide reference for the revision or promulgation of relevant normative documents on sludge land use in China. The results showed that: ① The quality of sludge products met the requirements of current international and industrial standards such as forest land and landscaping, and the recommended dosage of the standard was within the environmental capacity, but the current standard only indicated the maximum recommended dosage, and no accounting method for the maximum safe dosage within the recommended dosage was proposed. ② Compared with the empirical value method, the actual measurement method of supply and demand balance of nitrogen and phosphorus could scientifically calculate the maximum safe application amount of sludge products from three aspects: nitrogen and phosphorus demand of target plants, soil nitrogen and phosphorus nutrient supply, and nitrogen and phosphorus release capacity of sludge products, the calculation results of the actual measurement method were more accurate and reasonable. ③ Based on the current application direction and content of sludge land use standards, future research should focus on the nitrogen and phosphorus requirements of common plant species suitable for target application scenarios. A parameter table of annual nitrogen and phosphorus requirements for plants should be summarized under the two goal orientations: yield pursuit and landscape effect pursuit. Additionally, the nitrogen and phosphorus release and utilization rates of sludge products should be studied to determine their annual availability. By combining this with the soil fertility quality of the application site and using the nitrogen and phosphorus supply-demand balance methodology, the maximum safe application amount within the standard?recommended dosage range can be determined for specific application scenarios.
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