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Smell Abatement

becker systems for smell abatement
Already small quantities of becker /Kemira Anaerite 263 L and the intelligent electric becker control system can prevent the forming of smell. Smell emanating from wastewater can have quite different causes. Freshly drained water has an intensive inherent smell that can increase massively if anaerobic conditions arise in the drains, as under septic conditions bacteria can produce different fatty acids and sulphur compounds. The most unpleasant and dangerous one of these odour species is hydrogen sulphide (H2S). H2S does not just smell of rotten eggs, it also has a toxic effect even in small quantities and its decay products can lead to corrosion of the drains.

Effect of nitrates in smell abatement
Aerobic bacteria decompose organic material in wastewater by using oxygen. In the drainage system, the dissolved oxygen content in the wastewater can soon be reduced to almost zero. Furthermore, when there is a lack of dissolved oxygen, nitrate is inhaled by denitrifiers, since oxidised nitrogen compounds can replace oxygen in the system. As long as there are nitrates in the system, no significant putrefaction can arise in the wastewater. The 'natural' amount of nitrate existing in the wastewater is low and is on its own not enough to break down sulphates into sulphide with an ensuing formation of nitrogen. Therefore, products containing nitrate can be added in order to retard putrefaction of the wastewater.

Effects of ferrous salt in smell abatement
When the oxygen reserves in the form of nitrate have been used up, the wastewater becomes septic. Under these conditions, certain bacteria break down sulphates and hydrogen sulphide is produced as a by-product of energy generation. If iron is present in the wastewater, iron sulphide of a very low solvability will form. The sulphide will thus be a combined salt of low solvability and cannot escape in the open channels as toxic hydrogen sulphide gas. Trivalent iron is reduced in the channels to bivalent iron. This process can produce energy that counteracts putrefaction processes.

Disadvantages of ferrous salt products
Ferrous salts products do not prevent wastewater from becoming septic. The addition of ferrous salts only eliminates one group of substances. It is possible to eliminate sulphurous materials such as hydrogen sulphide and mercaptans, whilst all other smells arising from the putrefaction of the wastewater remain unaffected. Furthermore, the lowering of the pH-value by means of acid ferrous salts is problematic because most ferrous salt solutions are classified as being caustic under the law on dangerous substances and therefore require special precautions for storage.

Anaerite 263 L (iron III nitrate solution)
Anaerite 263 L can be dosed in small quantities without reducing the quality of the application. It does not have to be overdosed, as iron is added to the system at the same time in order to bind the hydrogen sulphide that forms during peak times. Furthermore, studies carried out in England showed that other synergetic effects lead to lower quantities required, up to 50% lower than with calcium nitrate.

A lower dosage means:
  • lower production cost
  • less loss of easily degradable carbon
  • less impact on the pH-value
  • lower quantity of iron sulphide solids colouring the water black
Low quantities of Anaerite 263 L can already prevent the formation of smells. Any hydrogen sulphide still forming will be intercepted by ferrous salts.

Anearite 263 L has been classified as irritating under the law on dangerous materials. Since it has been classified as a grade 1 low water hazard, there is no problem in storing the product even outside the premises.

The becker / Kemira-Anaerite concept for easy smell control
Apart from the products themselves, a controlled proportional feed and the measurement of results are of decisive importance for smell abatement in the drainage system. becker Elektromaschinenbau GmbH and Kemira provide a comprehensive concept.

On the basis of a control of the initial situation, our technicians enter a proportional feed programme into the control unit of the feeding device. The control unit regulates the required quantities of Anaerite 263 L, dependent on different initial parameters. In this way, the quantity used can be minimised. The proportional feed and the wastewater values as well as H2S concentrations are automatically stored on the becker Anaerite server. Using his Internet access and a password, the customer has direct access to these data. At the same time, the becker / Kemira service team can check the values and if necessary adjust the quantity required. If necessary, a telemetric device can be installed in the tank and thus the quantity of the product in the tank controlled. This service reduces the burden on the operator of the sewer lines by of taking care of maintenance and operation of the Anaerite plant.

becker Elektromaschinenbau GmbH / Kemira will relieve you of the smell control in your sewage lines and take care of the products and the quantity required as well as the control and measurement of results.

Please contact us if you have smell control problems.

becker Elektromaschinenbau GmbH · Phone: +49 (0) 2262-69900 · Fax: +49 (0) 2262-6230 · E-mail: · ^top^