Leachate containing primarily low molecular weight organic compounds are best treated by which method?

The best treatment method for leachate primarily containing low molecular weight organic compounds is through biological methods. This is because biological treatment processes utilize microorganisms to break down organic matter into simpler, less harmful substances. These microorganisms can effectively metabolize low molecular weight organic compounds, making biological methods particularly suitable in this scenario.

Typically, conventional biological treatment methods include aerobic and anaerobic processes, which are efficient in degrading organic pollutants. This method not only reduces the concentration of harmful constituents but can also transform them into non-toxic forms, allowing for safer disposal or further treatment.

In contrast, while physical and chemical methods can treat leachate, they may not be as efficient or cost-effective for specifically low molecular weight organic compounds. Chemical methods might involve oxidation or coagulation processes, which can be effective but may lead to the formation of by-products that require further treatment. Physical methods, such as adsorption or filtration, can also reduce the concentration of pollutants, but they do not degrade the compound chemically or biologically.

Combining biological methods with physical or chemical methods may enhance treatment effectiveness for certain leachates, but in the case of low molecular weight organic compounds, biological methods stand out as the best choice.