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Testing biogas efficiency

Q What is your product?

The Hach Lange TIM 840 titrator is a dedicated titration station for use in biogas generation facilities.

It monitors the organic acids and total inorganic carbon buffering capacity (FOS/TAC) ratio, a key indicator of efficiency.

Q How does it work?

Using a pH electrode the FOS/TAC ratio is calculated using a two-step end-point potentiometric titration. The sample is first titrated with 0.1N sulphuric acid to pH 5.0, which measures the carbon buffering capacity as CaCO3, and then continues to pH 4.4, where the total buffering capacity takes into account all organic acids in the sample. Pre-programmed equations then convert the result into the FOS/TAC ratio.

Q What benefits does it offer?

All you need is 5ml of coarsely filtered sample, press ‘Run’ and the result is displayed in five to seven minutes.

Q Where has it been used?

Biffa Waste, Energen Biogas, Farmgen, Barfoots, SAICA paper.

Q Cost?

Several thousand pounds depending on the electrodes/reagents/accessories ordered.

Q Any savings?

Reliable on-site analysis is needed in combination with continuously operating process instruments. Loading excessive levels of biomass into a digester could potentially lead to biomass inactivation and require a costly restart. Under-loading a digester means that less electricity is produced and potential revenue is lost.

Q What about maintenance?

Routine maintenance of the titrator is not necessary, though an annual service is available to have the functionality evaluated.

Q What is its life span?

There is no finite lifetime for the product or electrode. With good electrode maintenance and cleaning, it is possible to have no problems for several years.

Q How is it future-proofed?

The modular concept allows future expansion such as connection to an auto-sampler for increased throughput and virtually unlimited data storage capacity.

Q Anything else?

Hach Lange is able to provide plant operators with all the monitoring equipment necessary for testing the feed, the digesters and the effluent.

Katie Coyne

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