बाथरूम, रसोई, धोने के स्थानों और वॉशबेसिन से निकलने वाला अपशिष्ट जल, जिसमें मानव मल शामिल नहीं होता है, क्या कहलाता है?

Activated sludge process is an example of a/an:

Which of the following statements is/are correct regarding the activated sludge process? I. The activated sludge process provides a method of treating either raw sewage or settled sewage. II. The sewage effluent from the primary sedimentation tank is utilised in the activated sludge process.