CUIChao,XIONGJian-jun,MAFu-liang,et al.Land Safe Application Amount of Sludge Products Based on Environmental Capacity[J].China Water & Wastewater,2023,39(1):58-64.
Land Safe Application Amount of Sludge Products Based on Environmental Capacity
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
58-64
Column:
Date of publication:
2023-01-01
- Keywords:
- sludge product; land use; benchmarking method; environmental capacity method; safe application amount
- Abstract:
- Based on the soil background value of heavy metals in Beijing and the average quality of sludge products in central urban area in 2021, this paper analyzed the maximum safe application amount of sludge product, advantages and disadvantages of different calculation methods and the requirements of land use prevention and control by benchmarking method, static environmental capacity method and dynamic environmental capacity method from the perspective of environmental management. According to the benchmarking method, sludge products were suitable for forest land, landscaping, land improvement and agricultural level B purposes. The specific application amount should be implemented according to the corresponding standards. The static environmental capacity method did not consider the attenuation of heavy metals, the maximum safe application amount for one time was 830.9 t/(hm2·a), and those for 10 years, 30 years and 50 years were 83.1 t/(hm2·a), 27.7 t/(hm2·a) and 16.6 t/(hm2·a), respectively. The dynamic environmental capacity method considerd the attenuation of heavy metals, the maximum safe application amount for 5 years, 10 years, 30 years and 50 years were 247.3 t/(hm2·a), 163.6 t/(hm2·a), 118.3 t/(hm2·a) and 114.7 t/(hm2·a), respectively. According to the environmental capacity method, the heavy metal pollution risk of sludge products applied to soil in Beijing area was low and the land use potential was large, and the heavy metal risk in descending order was zinc, mercury, copper, cadmium, arsenic, chromium, nickel and lead. Mercury was the key element for safety risk prevention and control, and zinc was the element for ecological risk prevention and control. The dynamic safety calculation algorithm of “taking the standard limit as the bottom line and the environmental capacity as the baseline” was proposed to guide the application of sludge products in different land use directions.
Last Update:
2023-01-01