1. Does your company have a wastewater flowmeter? Can directly find out the cumulative wastewater discharge. 2. If there is no flowmeter, the total amount of general wastewater discharge is calculated according to 80%~90% of the company's total water consumption; The annual wastewater discharge of restaurants and shopping malls can be calculated according to 80% of the annual fresh water consumption; The annual wastewater discharge of beauty salons, barbershops and bathrooms can be calculated according to 85% of the annual fresh water consumption. 3. The total emission is 3. COD/BOD: Wi=Ci×Qi× 10W—— annual discharge of pollutants I from a sewage outlet (kg/ year) Q—— annual discharge of wastewater from this sewage outlet (10,000 tons/year).