In this article we will discuss about the microbes that are involved in leaching. Algae and oligotrophous nonspore forming bacteria belonging to the genera Pseudomonas, Corynebacterium and Arthrobacter predominate in the rocks. Many of them are capable of fixing atmospheric nitrogen. Rocks disintegrate mainly along cracks and at the surface. Accumulation of organic substances, leaching of elements and formation of [...]
Basically, there are two levels of sewage treatment on the basis of amount of sewage generated by humans: small scale treatment and large scale treatment. Small scale treatment of sewage is done in small homes and rural areas, whereas large scale treatment is done in towns and cities by municipal bodies. 1. Small Scale Sewage Treatment: There are several methods [...]
Anaerobic digestion is accomplished in three stages, solubilisation, acidogenesis and methanogenesis. Stage # 1. Solubilisation: It is the initial stage when feed stock is solubilized by water and enzyme. The feed stock is dissolved in water to make slurry. The complex polymers are hydrolysed into organic acids alcohols by hydrolytic fermentative methanogenic bacteria which are mostly anaerobes (Fig. 33.3A). Stage [...]