Ferti-irrigation

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Any distillery desirous of utilizing the effluent for ferti-irrigation should have completed construction and commissioning of primary biomethanation plant followed by a secondary two stage aerobic biological treatment plant. The BOD of the secondary treated effluent shall not exceed 500 mg/l..

The treated effluent, as in 2.1 shall be temporarily stored in the lagoons described in 1.4 and 1.5 from where it will be withdrawn for application.

The stored effluent will be diluted prior to irrigation such that the concentrations of any of the following critical constituents in the diluted effluent does not exceed the given maximum limits.

There are around 400 distillery units in India, with a total production capacity of about 3800 million litres of alcohol. Average generation of spent wash is around 8-12 litres / litre of alcohol produced, depending on continuous or batch process and quality of molasses used etc.

EC TDS Adj SAR Sodium Chloride BOD
3mmhos/cm 2.100 9.0 1.000m/gL 6oomg/L 100mg/L

The application rate of the diluted effluent shall be decided on the basis of the nitrogen content of the diluted effluent, the nitrogen requirement of the crop and the type of soil of the field. The nitrogen requirement of the crop may be met in one or more irrigations. Once the nitrogen requirement is met and if further irrigations are required, these will be done using fresh water.

In case more than one crop is grown in one year, the dilution and the application rates for each crop shall be calculated according to 2.3 and 2.4.

Effluent shall not be applied during germination and seedling growth.

Any concurrent use of fertilizers shall be done judiciously.

After one year of irrigation the land will be given rest for one year when only fresh water and fertilizers may be used as in normal practice.