SLUDGE

Mach column I with column II and select the correct answer from the given codes. {:(Column I,Column II),(A. "The stage in which of physical treatment of sewage is done",(i)"Anaerobic digestion activated sludge and production of biogas"),(B."The stage in which biological treatment of sewage is done",(ii)"Activated sludge"),(C."Name of the sediment in primary treatment",(iii)"Aeration tanks"),(D."It is carried to aeration tanks from primary",(iv)"Primary effluent"),(E."Name of the sediment in secondary treatment",(v)"Primary sludge"),(F."site of flocs growth",(vi)"Secondary treatment"),(G."Function of sludge digester",(vii)"Primary treatment"):}

Identify the True or False statements about the sewage treatment plants. I. The water is less polluted if BOD is high. II. Flocs are formed by anaerobic bacteria with fungal filaments in mesh-like structures. III. Activated sludge acts like an inoculum in activated sludge digesters. IV. In activated sludge digesters, gases like methane, hydrogen sulphide and carbon dioxide are formed.

Study the following statements and select the incorrect ones (i) Physical removeal of large and small particles through filtration and sedimentation is called primary sewage treamtent. (ii) Secondry sewage treatment is mainly a mechanical process (iii) Activated sludge sediment is a sewage treatement plant is a rich soruce of aerobic bactria.

Read the following statements. A. A few rivers in India are like sewers. B. Some cattle may die by feeding on plastic bags. C. Installation of wastewater treatment plants have cleaned up most of the rivers in India. D. Sludge is effectively utilised in the production of biogas.

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence. (a) Sludge is scraped out and skimmer removes the floating grease. (b) Water is made to settle in a large tank with a slope in the middle. (c) Large objects like plastic bags are removed by passing wastewater through bar screens. (d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater. (e) Wastewater enters a grit and sand removal tank.

Study the following statements and select the incorrect ones. (i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. (ii) Secondary sewage treatment is mainly a mechanical process. (iii) Activated sludge sediment in a sewage treatment plant is a rich source of aeroic bacteria. (iv) Biogas, commonly called as gobar gas, is pure methane.

Select the correct sequence of events in a sewage treatment process. A. Passages of primary effluent into large aeration tanks for mechanical agitation and pumping or air . B. Passage of effluent into the settings tank and formation of activated sludge. C. Physical removal of particles thought filtration and sedimentation . D. Release of effluent from the secondary temperature plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option. A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air. B. Passage of secondary effluent and formation of activated sludge. C. Physical removal of particles through filtration and sedimentation D. Release of effluent from the secondary treatment plant into natural water bodies. E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

"The activated sludge pumped into large tanks. Here, other kinds of bacteria, which grow anaerobically, digest the bacteria and the fungi in the sludge". This process of sewage treatment performed in which tank ?

Read the following statements about activated sludge. Br a. It is the effluent passed from anaerobic digester to the settling tank. Br b. A small part of activated sludge is pumped into large tanks called anaerobic sludge digesters. Br C. A small part of activated sludge is pumped back Into the aeration tank to serve as inoculum. Which of the above statements are incorrect?