Improved Chaotic Quantum-Behaved Particle Swarm Optimization Algorithm for Fuzzy Neural Network and Its Application

Table 4

Chinese surface water environmental quality index (unit: mg/L).

Items	Rank I	Rank II	Rank III	Rank IV	Rank V
Ammonia nitrogen	0.150	0.500	1.000	1.500	2.000
Dissolved oxygen	7.500	6.000	5.000	3.000	2.000
Chemical oxygen demand	15.000	15.000	20.000	30.000	40.000
Permanganate index	2.000	4.000	6.000	10.000	15.000
Total phosphorus	0.020	0.100	0.200	0.300	0.400
Total nitrogen	0.200	0.500	1.000	1.000	2.000
Applicable places	Source of water, national nature reserve	Life drinking water, surface water source protection area, rare aquatic habitat, fish and shrimp production field, etc	Life drinking water, surface water secondary protected areas, fish and shrimp wintering areas, etc	General industrial water and nondirect contact with the human body recreational water	Agricultural water areas and general landscape water