LAC 33:IX.5905. Secondary Treatment

The following paragraphs describe the minimum level of effluent quality attainable by secondary treatment in terms of the parameters BOD5, TSS, and pH. All requirements for each parameter shall be achieved except as provided in LAC 33:IX.5907 and 5911. A. BOD5 1. The 30-day average shall not exceed 30 mg/L. 2. The 7-day average shall not exceed 45 mg/L. 3. The 30-day average percent removal shall not be less than 85 percent. 4. At the option of the LPDES permitting authority, in lieu of the parameter BOD5 and the levels of the effluent quality specified in LAC 33:IX.5905.A.1-3, the parameter CBOD5 may be substituted with the following levels of the CBOD5 effluent quality provided: a. the 30-day average shall not exceed 25 mg/L; b. the 7-day average shall not exceed 40 mg/L; c. the 30-day average percent removal shall not be less than 85 percent. B. TSS 1. The 30-day average shall not exceed 30 mg/L. 2. The 7-day average shall not exceed 45 mg/L. 3. The 30-day average percent removal shall not be less than 85 percent. C. pH. The effluent values for pH shall be maintained within the limits of 6.0 to 9.0 unless the publicly owned treatment works demonstrates that: 1. inorganic chemicals are not added to the waste stream as part of the treatment process; and 2. contributions from industrial sources do not cause the pH of the effluent to be less than 6.0 or greater than 9.0.