(2) Calculate the destruction efficiency of the biological treatment unit using Equation 1 to this paragraph (n)(2) in accordance with the procedures described in paragraphs (n)(2)(i) through (viii) of this section. You have demonstrated initial compliance if E is greater than or equal to 90 percent. View Image
Where:
E = destruction efficiency of total PSHAP and SHAP for the biological treatment unit including the equalization unit, neutralization unit, and/or clarifier, percent;
QMWa = mass flow rate of total PSHAP and SHAP compounds entering the equalization unit (or whichever of the three types of units is first), kilograms per hour (kg/hr);
QMGe = mass flow rate of total PSHAP and SHAP compounds emitted from the equalization unit, kg/hr;
QMGn = mass flow rate of total PSHAP and SHAP compounds emitted from the neutralization unit, kg/hr;
QMGc = mass flow rate of total PSHAP and SHAP compounds emitted from the clarifier, kg/hr
Fbio = site-specific fraction of PSHAP and SHAP compounds biodegraded in the biological treatment unit.
(i) Include all PSHAP and SHAP compounds in both Group 1 and Group 2 wastewater streams from all MCPU, except you may exclude any compounds that meet the criteria specified in § 63.145(a)(6)(ii) or (iii) .(ii) Except as specified in paragraph (n)(2)(vii) of this section, conduct the demonstration under representative process unit and treatment unit operating conditions in accordance with § 63.145(a)(3) and (4) .(iii) Determine PSHAP and SHAP concentrations and the total wastewater flow rate at the inlet to the equalization unit in accordance with § 63.145(f)(1) and (2) . References in § 63.145(f)(1) and (2) to required mass removal and actual mass removal do not apply for the purposes of this section.(iv) Determine Fbio for the activated sludge unit as specified in § 63.145(h) , except as specified in paragraph (n)(2)(iv)(A) or paragraph (n)(2)(iv)(B) of this section. (A) If the biological treatment process meets both of the requirements specified in § 63.145(h)(1)(i) and (ii) , you may elect to replace the Fbio term in Equation 1 to paragraph (n)(2) of this section with the numeral "1."(B) You may elect to assume fbio is zero for any compounds on List 2 of table 36 in subpart G.(v) Determine QMGe, QMGn, and QMGc using EPA's WATER9 model or the most recent update to this model, and conduct testing or use other procedures to validate the modeling results.(vi) Submit the data and results of your demonstration, including both a description of and the results of your WATER9 modeling validation procedures, in your notification of compliance status report as specified in § 63.2520(d)(2)(ii) .(vii) Beginning no later than the compliance dates specified in § 63.2445(g) , the requirement of § 63.145(a)(3) no longer applies. Instead, you must comply with the conditions specified in § 63.2450(g)(6) .