It is generated during production and processing in industrial and commercial plants. For the most part, it consists of flushing water that is generated during cleaning work. Sometimes, it also consists of domestic wastewater from sanitary facilities or residential houses. In general, such waste waters can have varied compositions depending upon the branch of industry. The inflow volumes, loads and concentrations as well as the pH-values are mostly subject to strong fluctuations. The presence of cleaning agents and disinfectants also has a disturbing effect.
The commercial wastewater of dairy plants stems from cleaning of production plants. Mostly, this is “white” water from milk production or “white” water with whey from cheese production.
|In order to prevent inhibition of biodegradation due to the
presence of too many lipophilic compounds, a KLARO grease
separator should be installed upstream of the treatment plant.
This is additionally used for pH-neutralisation.
Further preliminary clarification steps fulfil the following functions:
|• equalisation of fluctuating inflow values|
|• storage of inflow water|
|• sludge storage|
|Example of plant|
|For up to 2,7 m3 /d, thereof 1,8 m3 /d from a dairy farm with a milk output of 1,000 l/day or 1.8 m3 /day “white” water (dairy wastewater) and a domestic wastewater connection of 0,9 m3 /d.|
The commercial wastewater from breweries mostly stems from cleaning of production plants and can contain large debris, such as shards, labels, brewer grains and crown caps. Over the week, strong fluctuations in wastewater volumes and loads as well as pH-values can occur. Basically, the water is considered to be easily biodegradable if the COD/BOD ratio is advantageous, with higher inflow concentrations than in domestic wastewater (BOD5 – values up to 4,000 mg/l)