Odour Management for Abattoirs and Tanneries
Abattoirs and tanneries are an essential part of the economy but face challenges to minimise their impact on the surrounding community. This becomes more difficult as urban creep places residential areas close to their premises. Regulators place strict conditions on animal processing facilities and impose severe fines for persistent non-compliance.
Animals and animal products generate odours due to the biological action of bacteria that break down organic material. Volatile organic compounds, ammonia and hydrogen sulphide are produced by the bacteria, all which trigger the human sense of smell as a bad odour.
There are several specific sources of odour within an abattoir or tannery.
Primary sources of odours in abattoirs and tanneries
Effluent Treatment Plants
Effluent treatment plants receive liquid waste from abattoir processes. Solids are removed from the liquid stream using screens. These solids are collected for disposal in bins. Liquid waste passes through aerated and settlement ponds. The liquid waste must be managed to minimise odours before and during treatment.
Meat Rendering Plants
Meat rendering plants process animal by-products into high protein meat or bone meal. The nature of processing animal products means that numerous odour sources are present in the plant. Raw material bins, meal storage bins, tallow storage tanks and blood tanks all produce odours that are offensive to the human sense of smell.
Blood Handling and Drying
Another key source of odour in abattoirs is the processing of blood. The longer blood remains unprocessed, the more offensive the smells that it generates.
Animal Pens or Yards
Animals must be kept in pens or yards prior to processing. They produce manure and urine which soils the area and generates odours.
Waste solids like paunch, which is partially digested animal feed generate high concentrations of odorous gases. Composting waste solids on site compounds this situation.
Abattoirs and tanneries have the potential for odour problems and complaints from residential neighbours. Odour control systems are essential to keep compliant with regulators and on good terms with neighbours.
Key odour control solutions for abattoirs and tanneries
Three main odour treatment technologies are used by abattoirs and tanneries:
Waste water treatment is a critical process to manage odours from abattoirs and tanneries. It is important for the decomposition of biological waste to be completed as quickly as possible so that the formation of odour producing compounds is limited.
OdourPro micronutrient additives cultivate facultative bacteria that break down organic material in an odourless process. They reduce Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand. The net effect is an increase in the rate of decomposition and a decrease in odours.
In processing units where it is possible to contain emitted gases and route them to a filtration system, biofilters provide an excellent treatment option. Up to 95% of odours can be removed through biofiltration.
Biofiltration relies on the removal and oxidation of organic gases and VOCs by the activity of microorganisms. The system works by first passing the gases through a humidifier to raise the moisture content. The next step is for the gases to flow through an organic filter medium to remove the harmful components through oxidation. Finally, the odourless gases are released through the vent stack. Filter media can last as long as ten years.
Atmospheric misting systems are designed to control odours in the atmosphere that cannot be prevented in any other way. Animal yards are an example of a large surface area generating odours which are released directly into the atmosphere.
An active ingredient is misted or vaporised into the air at the boundary of the odour source or of the facility itself. Once dispersed, it reacts with the odour particles in the air. In some cases, the product is sprayed directly onto the problem surface area to suppress the release of odours.
The active ingredient is made from organic compounds and oils. They chemically neutralise odours on contact - rather than just mask the smell.
Contact OdourPro for more information about odour control for abattoirs and tanneries
OdourPro understands the abattoir and tannery industry. We have extensive experience in identifying odour sources and providing effective solutions. Our micronutrient additives are a proven solution for waste water treatment. Our biofiltration technology removes up to 95% of odours. And, our atmospheric misting systems do not just mask odours - they neutralise them. Let our technical experts help your business overcome the challenges of odours.
OdourPro on 21 November 2016
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