Take each table (8 people) as an example: each table discharges 1.4 tons of sewage every day, and the concentration of chemical oxygen consumption in sewage is 1.521mg/L, the concentration of animal and vegetable oil is 1.33mg/L, and the concentration of suspended sewage is 671mg/L.. By calculating the pollution equivalent number as 31.24, according to the national regulations, the charging standard for each pollution equivalent number is 1.7 yuan, and then implementing the policy of double charging and multiplying it by the regional adjustment coefficient (1.2 in urban area, 1.1 in suburban area and 1.1 in rural area), it is calculated that each table in urban catering industry should be charged 51.8 yuan per month, 46.6 yuan per table in suburban catering industry and 42.4 yuan per table in rural catering industry.