“…In detail, based on the national water quality standard (GB 8978–1996), is the following pollutants are investigated: chemical oxygen demand (COD), ammonia nitrogen (NH 3 ‐N), phosphorus (P), petroleum pollutants (PP), volatile phenol (V‐ArOH), cyanide, mercury (Hg), cadmium (Cd), chromium (Cr), lead (Pb), and arsenic (As). The detailed blue/gray water can be calculated as follows:
where
(tonne) and
(tonne) are blue and gray WFs of sector
, respectively;
(tonne/year) is the total amount of pollutant
discharged by sector
;
(tonne/10 3 m 3 ) is the concentrations of pollutant
based on the Grade III Wastewater Discharge Standard (i.e., GB 8978–1,996);
(tonne/10 3 m 3 ) is the natural concentration of pollutant
in the receiving water (Aldaya,
2012; He et al.,
2020).…”