Abstract

MUNANTE CARRILLO, Keila Abigail et al. Use of cow manure and dry grass in the vermi- stabilization of residual sludge from WWTP (wastewater treatment plant) Magollo. Rev. Cien. Tec. In. [online]. 2022, vol.20, n.26, pp.161-178. ISSN 2225-8787.  https://doi.org/10.56469/rcti.vol20n26.712.

The wastewater treatment at the Magollo Treatment Plant generates considerable amounts of residual sludge, which lack efficient treatment and adequate final disposal. In fact, this means a serious environmental problem for Tacna region, Peru. With all this in mind, there is the need of seeking sustainable and economic alternatives that can cope with it. Vermistabilization consists of using Californian earthworms (Eisenia foetida) for residual sludge treatment, aided by other organic materials. This paper aims at taking advantage of cattle manure and dry grass to vermistabilize the residual sludge from the Magollo Wastewater Treatment Plant, Tacna - Peru. This study applied a 4 x 2 multilevel factorial design with three repetitions, and established several amounts of manure and grass, while the amount of sewage sludge and E. foetida remained constant in all treatments. This study also involves an analysis on the pH and electrical conductivity (EC) of substrates. The results showed that the more amount of organic material, the more increase obtained in pH and electrical conductivity. It was determined that treatment 8 (1 kg of manure and 0.5 kg of dry grass) had a higher germination rate at 5% of mud extracts equal to 89.90%, showing that vermistabilization is an effective technique for residual sludge treatment and reduction in its toxicity.

Keywords : California earthworms; sewage sludge pH; electrical conductivity; germination rate.

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