A sewerage drain field and a septic tank make up a small scale sewage treatment system. A septic tank is basically a rectangular shaped underground receptacle for wastewater. It is watertight, made of concrete, and consists of tanks that are divided into chambers. The first chamber has twice the volume as the second and the majority of the organic solid matter, referred to as sludge, gets settled here. The second chamber further purifies the wastewater.
Properly digested sludge can be used as a natural fertilizer; this is possible only if no fresh wastewater is added to the tank for at least one week.Your best bet is to speak to a few different septic tank installation companies, then choose the one whose price you are okay with and who you feel will do the finest work based on your conversations. These septic tank installation companies will know how to get the right information, and the proper permits, once they have done the necessary testing on your prospective property. Then they will plan the right system for your house based on where they should do the septic tank installation, how many people will be living in your home, how big your home will be etc. It will cost you a few hundred dollars to have them design this system and potentially save you thousands. You should have this done before you buy the land just in case there is any reason that you will be unable to put a septic system in.* D Smith, sun lounge extension to rear (conservation area), 11 Sike Close,Totties, Holmfir th.The septic tank collects wastewater from toilets, showers, sinks, etc. Due to the absence of a current the sludge quickly settles down to the tank floor. Anaerobic bacterial digestive activity on the sludge leads to the generation of methane and carbon dioxide; the sludge is stabilized and does not rot anymore. Particles of stabilized sludge stay settled, some may float to the top as scum.The semi-purified water moves to the second chamber via the overflows that are constructed such that the upward motion of water prevents larger particles from flowing into the second chamber. The feeding, digestion, and settlement of organic matter continues in the second chamber. The retention time in the second chamber is half that of the first chamber because of its size and the fact that the amount of organic matter to treat is less. The outlet is constructed in the diagonal corner to the overflow.* Dr Michael O'Grady, decking to rear, 71 Woodhead Road, Honley.The septic tank may be emptied every 5-7 years depending upon the amount of wastewater it processes. The tank is emptied using an exhauster truck manned by trained personnel. The sludge that is sucked into the exhauster truck is released into public waste water treatment plants, sanitary landfills, or sludge drying beds.
The design of the septic tank should be such that the wastewater always flows in its designated path and no short circuits in the water flow occur. T-pipe-connectors with inflow and outflow openings under the water level should be used for inlet, overflow, and outlet pipes. This prevents the floating scum from clogging the pipes. A grease trap should be provided for the wastewater inflow pipe.
Author: Scott Leahy
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