Research on Danjiang Water Quality Prediction Based on Improved Artificial Bee Colony Algorithm and Optimized BP Neural Network

Table 2

Water quality content grades and classification standards.

Taxon description	Class 1	Class 2	Class 3	Class 4	Class 5
NH3–N/mg • L^−1	0–0.15	0.15–0.50	0.5–1.0	1.0–1.5	1.5–2.0
DO/mg • L^−1	7.5–6.0	6.0–5.0	5.0–4.0	4.0–2.0	2.0–0
COD/mg • L^−1	0–10	10–15	15–20	20–30	30–40
IMn/mg • L^−1	0–2.0	2.0–4.0	4.0–6.0	6.0–10	10–15
Total phosphorus/mg • L^−1	0–0.02	0.02–0.10	0.10–0.20	0.20–0.30	0.30–0.40
Total nitrogen/mg • L^−1	0–0.20	0.20–0.50	0.50–1.0	1.0–1.5	1.5–2.0