In this article we will discuss about the composition of sewage. Sewage is the used and wastewater consisting of human excreta, wash waters, and industrial and agricultural wastes (e.g. wastes from live stock i.e. chicken, cattle, horse, etc.) that enter the sewage system. In general sewage contains about 95.5% water and 0.1 to 0.5% organic and inorganic materials. The solid [...]
Algae, bacteria, actinomycetes, fungi, higher plants, cyanobacteria., are the major microorganisms reported to tolerate heavy metals which universally occur in diverse ecosystems with meaning frequency. 1. Algae: The species of Chlorella, Anabaena inaequalis, Westiellopsis prolifica, Stigeo clonium tenue, Synechococcus species, Selenastrum capricornutum etc. tolerate heavy metals. 2. Bacteria: Bacteria resistant to heavy metals were frequently isolated from environmental sources such [...]
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 [...]