Hey, This is my first post as part of our new education blog which will be focusing on all areas of package wastewater and surface water treament. The aim of the blog will be to explain different elements of the waste/surface water treatment process/terminology in easy to understand bite size chunks. Our initial focus
Sewage Parameters 1: BOD Before discussing package sewage treatment it is best to explain the parameters used to define sewage both when it comes into a treatment plant (influent) and when it leaves a sewage treatment plant (effluent) One of the main parameters to consider is BOD or BOD5 which means Biochemical Oxygen Demand (the ’5′ refers
Sewage Parameters 2: Suspended Solids (SS) The next topic in our Sewage Treatment Parameters Education Series is Suspended Solids (SS) which is usually stated in conjunction with Biochemical Oxygen Demand (BOD). The normal European discharge standard for SS is 35 mg/l and is usually quoted in short as ’25/35′ effluent (BOD of 25 mg/l &
Next up in our Education Blog series is Population Equivalent or PE. It is the term most used to describe the size of package sewage treatment plants. It can be defined as; ‘The equivalent, in terms of a fixed population, of a varying or transient population (e.g. Restaurant or Airport) based upon a figure
Continuing on from the last blog on Population Equivalent (PE) here are some further illustrative PE calculations: A. Housing Development with: 10 No. 2 Bedroom Old Persons Dwellings, 25 No. 3 Bedroom Houses 10 No. 4 Bedroom Houses. Relavent Figures: 1 PE = 200 l of flow & 60 g of BOD per day.
Hey again, Continuing on from Population Equivalent (PE) the next parameter is Phosphorus (P) The reason that Phosphorus is often a focused on in wastewater effluent is that it is an essential mineral in the growth of algae and other biological organisms along with Nitrogen. Therefore releasing high Phosphorus levels into a water course
Hey again, Last time we discussed Phosphorus (P) in its different forms and why it is important as regards package wastewater treatment. It is frequently being specified as an effluent parameter at levels from 0.5 – 5 mg/l. The easiest way to decrease P in sewage effluent is to investigate if a specific cause
Hi, The last topic that was discussed on this blog was Phosphorus (P). Next we are going to move on to the complex topic of Ammonia (NH4) and how to remove it from sewage. The presence of nutrients in wastewater, such as nitrogen (N) has long been recognised as a source of over enrichment
Hi, continuing on from the last entry in our education blog, we will now go through a simple example of how to calculate the extra package effluent treatment plant capacity required in term of Population Equivalents (PE) to achieve the correct level of Ammonia removal (NH4) from wastewater effluent. More on the theory can be found
Hi, we are back to discuss how to lower the total level of Nitrogen from inlet to outlet of a sewage treatment plant. Total Nitrogen is often abbreviated to TN or N. The reduction of TN is a two stage process involving the conversion of Ammonia (NH4) to Nitrates (NO3) termed Nitrification, followed by the conversion
