Commercial wastewater

Commercial wastewater

What is commercial wastewater?

 

Commercial wastewater 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.

A biological treatment plant process is considered primarily in the case of wastewaters generated in the food production industry.

Generally, the KLARO SBR technology is very well suited to such applications thanks to its flexibility and sturdy design. However, each project must be considered individually.

Breweries

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)

Breweries

Process concept

Since diverse large debris and grit could be present in the wastewater, breweries must include a preliminary treatment tank in their wastewater treatment plant. This fulfils the following functions:

  • retention of large debris and equalisation of fluctuating inflow values
  • storage of inflow water
  • sludge storage


This is followed by clarification using the KLARO SBR process.

 

Example of plant

Example of a plant for up to 9 m³/d for a brewery with a beer output of 1,000 hl (hecto liter)/beer per year:

Example of plant

Dairy plants

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.

Many production areas demonstrate equally high proportions of lipophilic compounds (grease) and P-loads. Basically, the inflow concentrations are higher than in domestic wastewater (BOD5 values up to 3,000 mg/l).

A good COD/BOD ratio is advantageous for biodegradability.

Dairy plants

Process concept

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

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.

Milchverarbeitungsbetrieb Anlagenbeispiel

Wineries

The commercial wastewater from wineries stems from cleaning of production plants and can contain large debris, such as pomace, labels and cork residues, tartar and filtration residues.

Due to seasonal peak load, the pH-values, wastewater volumes and loads vary considerably.

Due to the advantageous COD/BOD ratio, the wastewater is considered as easily biodegradable and demonstrates low P and N contents.

The inflow values can rise up to BOD5 4,000 mg/l. Often, there is a combined inflow of domestic and commercial wastewater.

Wineries

Process concept

Due to seasonal peak load during grape harvesting, a two-line SBR process is recommended. Large debris such as pomace must be retained even before the waste water enters the treatment stage.

A preliminary treatment plant prior to bio-degradation fulfils the following functions:

    • retention of large debris: equalisation of fluctuating inflow values
    • storage of inflow water
    • sludge storage

     

    Example of plant

    Example of a plant for up to 13,5 m³/d for a winery with a wine output of 100,000 l/wine per year.

    Example of plant