Application of biosolids (sewage sludge) in agricultural soils: a case study for corn seed LVN10

Abstract

Reuse of biosolids aiming to take advantage of its nutrients and micronutrients for arable crops is an economical approach, in which wastes are considered potential resources and bring a variety of benefits. However, heavy metal residuals in sewage sludge have been gaining attention due to accumulation risk and adverse effects on the environment. This study experimented with sludges from Binh Hung municipal wastewater treatment plants treated by anaerobic co-digestion process on corn seed LVN10 to assess corn growth and heavy metals accumulation contents in various components of the corn and the soil. Consequently, within 90 days of using biosolids as treatments 1% and 3%, i.e., the corresponding amount of biosolids over the soil weight, there was no inhibition but growth stimulation for corn growth surveyed. Accumulations of Cu, Cd, Pb, Zn, Ni in roots, stalk, leaves, and mature corn and cultivated soil complied with the national regulations. The effectiveness of biosolids application for corn production in this study will benefit the depreciation of sludge production from municipal wastewater treatment plants and other applications for agricultural plants in the future.