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.
Discussion and Thinking on Land Use of Sludge Products Based on Nitrogen and Phosphorus Supply and Demand Balance Method
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第8期
Page:
40-46
Column:
Date of publication:
2025-04-17
- Keywords:
- sludge product; land use; supply and demand balance method of nitrogen and phosphorus; maximum safe application amounts
- 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.
Last Update:
2025-04-17