Working Of Septic Tank

In the grit chamber, sand, grit, settleable inorganic matter, etc. settle before sewage enters the anaerobic chamber. In the anaerobic chamber, organic solids settle at the bottom of the tank where anaerobic bacteria act on it and convert complex unstable compounds into simple stable compounds.

Nitrogen is converted into ammonia and the mixture becomes alkaline. The colloidal matter is flocculated and then liquefied and finally digested. Discharged organic matters are also digested.

Due to these processes, there is a considerable reduction in the volume of sludge and it settles at the bottom of the tank. The clarified sewage discharges through the outlet.

Cases are liberated due to sludge digestion which rises to the surface constantly in the form of bubbles. These bubbles carry small particles of decomposed sludge and a floating layer of scum (black in color) is formed on the surface.

The scum contains anaerobic bacteria that attacks the undissolved components of the incoming sewage sludge particles freed from gas bubbles at the surface lose their buoyancy and settle back at the bottom of the tank.

Sludge in a septic tank maybe 25% to 30% less in weight and 75% to 80% less in volume than the sludge from a sedimentation tank.

Sludge removed is disposed of in a safe manner after drying before the tank is put to use. Effluent should be properly disposed of. A septic tank may be constructed in series to act like two-stage sludge digestion tanks. But single-stage septic tanks are very common.

The accumulation of sludge at the bottom of the tank decreases its storage capacity and hence septic tanks should be cleaned every 6 to 12 months. In rare situations, it should be cleaned at least once in two years.

RS Aggarwal Aptitude Book PDF Free Download

RS Aggarwal Aptitude Book PDF Free Download RS Agarwal Aptitude Book PDF Free Download: Quantitative Aptitude by R.S Aggarwal is a standout amongst the most inclining books among the hopefuls getting ready for Bank PO, PO, MBA, RBI, IBPS, CAT, SSC, IAS, PSC, Hotel Management, Railway Recruitment Exams, and other aggressive and placement tests. This book is suggested by different specialists in this field. This book covers relatively every theme which is being requested for the focused exams. On the off chance that you are looking to Download RS Aggarwal Quantitative Aptitude PDF's most recent version with the expectation of complimentary then you appear to be at the correct place. Download PDF RS Agarwal Aptitude Book PDF Free Download This book covers Problems on Surds and Indices, Simplification, Numbers and Ages, Pipes and Cisterns, Boats and Streams, Problems on Trains, Simple and Compound Interests, Time and Work, Permutations and Combination, Clocks, Odd Man Out, Heights

Limitations of Terzaghi Theory

Limitations of Terzaghi Theory The value of the coefficient of consolidation has been assumed to be constant. The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated. There is sometimes difficulty 1n locating the drainage face, and sometimes thin previous seams that can act as good drainage faces are missed in the boring operations. The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation. The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation. In actual practice, the pressure distribution may be far from linear or uniform.

Types Of Current Collector

Current Collector A current collector is a device used to collect electrical current from a moving conductor, such as a train or a trolley. It is typically used in electric vehicles, such as trains and trams, to transfer power from an overhead power source to the vehicle's electric motor. The current collector consists of a sliding contact, which is often made of carbon or copper, that makes contact with an overhead power source, such as an overhead catenary wire or a third rail. The sliding contact is mounted on the vehicle and is typically in the form of a pantograph or a trolley pole. The pantograph is a device with a metal frame and a spring-loaded arm that presses against the overhead power source. It is raised and lowered by the operator of the vehicle, and as it moves along the overhead power source it maintains contact and collects the electrical current. The trolley pole is a vertical pole that is mounted on the roof of the vehicle and has a horizontal arm that extends out

Self Study World

Search This Blog