Where is the major part of sludge pumped in secondary treatment?

What are biofertilisers? Give two examples. </h2></div>

Who was the first person to discover an antibiotic?

The bacteria nostoc are used as food because they have abundant amount of ________ and _______.</h2></div>

Vitamin <span class="katex"><span class="katex-html" aria-hidden="true"><sp…

What happens when activated sludge is pumped into aerobic digester?</h2></div>

Which is used as biofertilizer?</h2></div>

Which of the following statements is correct with regard to biocontrol agents ?<span><br> </span></…