LIVESTOCK AND FARMING INDUSTRY
Waste water generated by this sector, is in direction relation with animal excrement, as well as surface cleaning of facilities. The generated effluent has a high level of organic load, high contents of ammonia, nitrogen and phosphorus. Other compounds derived from cleaning and disinfecting premises, such as ammonium, acids, phenols and alcohols can also be found.
Effluents from livestock farms, can also show contamination levels from microbiological sources.
Common treatments for this type of effluent comprises of two distinct stages:
1. Separating solid and liquid fractions, by filtration or centrifugation. The solid fraction is a recoverable waste, following different techniques, such as anaerobic digestion.
2. Liquid filtration must be processed with a biological treatment, endowed with nutrient removal. Ultrafiltration MBR devices, show an appropriate behavior for this purpose. The liquid digestion of the effluent source (UASB ), is also a valid alternative for the treatment of such waters.
The main feature of this industry, is the high consumption of water in its production processes, which generate an effluent with a high organic load, as well as suspended solids and surfactants. Byproducts from this productive activity(blood, viscera, skin, fat, etc..), are very diverse and with a high contamination potential.
Treatments consists of two stages.
1. This is based on Electrocoagulation systems, which make it possible to significantly improve the purification performance of further biological treatment.
2. A biological treatment. The biological process must include an efficient pre-treatment system, focused on separating oils, fats and suspended settleable solids, in order to yield good depuration performances
The dairy industry uses water for cleansing and purging of different tanks and processing facilities. Water has a high organic load content, suspended solids, phosphorus, oils and fats. This water shows pH, temperature and conductivity variations, which are a limiting factor for effluent treatment.
Treatments: A conventional treatment for this type of water, must include the separation of fats and oils, removal of suspended solids by flotation and a biological treatment with nutrient removal.
Generally, the food industry sector consumes a high volume of water in production processes, as well as having variable water quality. It is therefore desirable, to provide the installation with homogenisation tanks. The tanks are intended to laminate the water flow and load water into the treatment plant, following which investment and operating steps can be reduced.
The most suitable complete treatment for waste water in this sector, consists of a two-stage biological process:
1. An anaerobic treatment
2. An anerobic treatment, enabling nutrient removal.