Skip to main content

Working Of Septic Tank

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.
Working Of Septic 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.

Popular posts from this blog

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, sometimes thin previous seams that can act as good drainage face 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. Read More Muller-Breslau principle

Price Guard Wire Method

Price Guard Wire Method Some form of  Price Guard Wire Method  is generally used to eliminate the errors caused by leakage currents over insulation. Fig. 3.14 illustrates the operation of This Method. In fig 3.14(a), a high resistance mounted on a piece of insulating material is measured by the ammeter voltmeter method. The micro-ammeter measures the sum of the current through the resistor (IR) and the current through the leakage path around the resistor. The measured value of resistance computed from the readings indicated on the voltmeter and the microammeter, will not be a true value but will be in error.   Figure 3.14 Application of  guard  circuit for measurement of high resistance In fig, 3.14 (b), the  guard  terminal has been added to the resistance terminal block. The  guard  terminal surrounds the resistance terminal entirely and is connected to the battery side of the micro-ammeter. The leakage current IL now

Negative Booster

Negative booster A negative booster is employed to conform to the regulation that the potential difference between any two points of the rail return shall not exceed 7 V. Two boosters, positive and negative, are used which are mechanically coupled together and driven by a DC motor. The positive booster is connected to the trolley wire (near the generating station) and the negative booster (separately excited) is connected to the track rail.  The 'positive booster' adds voltage to the line while the 'negative booster lowers the potential of the point it is connected to. As we go along the trolley wire away from the generating station/sub-station, the potential drop increases, and the voltage of the trolley wire falls. Since the current returns via the track rail points away from the generating station acquire high potentials. This potential is brought down by the negative boost provided by the negative booster. When the load is sufficiently far aw