Environmental Engineering Reference
In-Depth Information
Table 9.5
Summary of the results of scenario analysis
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According to the model estimates, the amount of phosphorus recovered from
21.2 kt of phosphorus in poultry manure was 14.7 kt; the cost of electric power
required for the recovery was 3688 million yen; the cost of chemicals was
323 million yen; the cost of fuel was 2436 million yen; and the cost of other
raw materials was 158 million yen. Further, by reusing 14.7 kt of phosphorus
from poultry manure as fertilizer, the phosphorus in poultry manure, which accu-
mulates in the soil, such as in ranches, and is used for growing feed, such as
pasturage, decreased by 14.7 kt, and the phosphorus originating from imported
ammonium phosphate and wet phosphoric acid, which is used in fertilizer pro-
duction, decreased by 14.7 kt.
2. Phosphorus recovery from wastewater using the HAP method
The amount of phosphorus contained in wastewater discharged from human
activity is 57.4 kt. Of this amount, 38.8 kt of phosphorus is dispersed into the
water after treatment and 18.5 kt is concentrated in sewage sludge. In this sce-
nario, 10 kt of phosphorus is recovered by the HAP method from the wastewater
that was previously discharged into watercourses.
In order to recover 10 kt of phosphorus from wastewater, it is necessary to treat
12.5 kt of wastewater containing phosphorus using the HAP method, and 580 mil-
lion yen of electric power and 2190 million yen of chemicals are required for the
recovery. However, by reusing 10 kt of phosphorus recovered from wastewater
as sewage sludge fertilizer, the demand for phosphorus in compound fertilizers,
which had been produced in the industrial sector, decreases by 10 kt.
3. In recent years, technologies have been developed for the recovery of high con-
centrations of phosphorus as bio-phosphorus ore and yellow phosphorus from
sewage sludge, and their reuse in industrial fields as phosphorus products with
high added value is expected. As a result of analysis of the scenario, it was found
that by recovering bio-phosphorus from sewage sludge using the Heatphos
