" urban sewage treatment plant pollutant discharge standard ":
Carried out " comprehensive emission standard of sewage " (GB8978-96) to the management of the municipal sewage plant before 2002 . Because most indicators of this standard are for industry to abolish aqueously, the construction of the municipal sewage plant was still at the starting stage at that time, treatment technology is still during the course of developing, so, the pertinence to the municipal sewage is not strong. Quite a few of reference value is partial and wide, and the specific indicator has certain difficulty in technology up to standard in economy. For instance: As to effluent of urban sewage treatment plant, heavy metal, pollute organic matter, petroleum, it moves vegetable oil, LAS indicator to be reference value partial and wide a little; And total phosphorus is partial and tight, regular secondary treatment and treatment process of the ruggedization second are difficult to reach the current comprehensive standards of 0.5 mg/L and 1 mg/L, for this reason State Environmental Protection Head Bureau science and technology standard department proposed " urban sewage treatment plant pollutant emission standard " in 2001, and State Environmental Protection Head Bureau and national technical supervision examined the general bureau and sanctioned releasing on December 27, 2002, implemented formally on July 1, 2003.
Applicable scope of " urban the intersection of sewage treatment plant and the intersection of pollutant and emission standard " define the regulation is: Specially to sewage, waste gas, national professional pollutant emission standard that mud disposal of pollutants is made of urban sewage treatment plant, suitable for sewage discharge, discharge and discharge and control and management of sludge disposal of waste gas of urban sewage treatment plant. According to national comprehensive emission standard and principle that the national professional emission standard does not carry out alternately, after this Standard is implemented, the discharge of urban sewage treatment plant sewage, waste gas and mud does not carry out the comprehensive emission standard again. The noise control of sewage treatment plant still carries out the country or local noise control standard.
Table 1 " standard " basically controls the special project to be highest and allows to discharge the thickness (the mean value of day)
Special project Basically control the special project Primary standard Grade two Grade three
A standard B standard
A chemical oxygen demand (COD) (mg/L) 50/60 60/60 100/120 120
2 biochemical oxygen demand (BOD) (mg/L) 10/20 20/20 30/30 60
3 suspended matters (SS) (mg/L) 10/20 20/20 30/30 50
4 moves the vegetable oil (mg/L) 1/20 3/20 5/20 20
5 petroleum (mg/L) 1/10 3/10 5/10 15
6 anion surface active agents (mg/L) 0.5/5 1/5 2/5 5
7 total nitrogen (by N) (mg/L) 15/- 20/- --
8 ammonia nitrogen (by N) (mg/L) 5(8) /15 8(15) /15 25(30) /25 -
9 total phosphorus (by P) (mg/L) 1/0.5 1.5/0.5 3/1 5
10 chroma / dilution ratio 30/50 30/50 40/80 50
11 pH 6- 9/6- 9 6- 9/6- 9 6- 9/6- 9 6- 9
12 Fecal coliform and E. Coli counts (one / L) 103/- 104/- 104/- -
Note: > control indicator at 12 ¡æ that outside the bracket is a water temperature, is in the bracket a water temperature? Control indicator at 12 ¡æ. /The front and back number value represents reference value now separately, carries out the standard originally.