Characterization of Digestates from Anaerobic Co-Digestion of Manioc Effluent, Human Urine and Cow Dung

Abstract

This study focused on the characterization of digestates resulting from anaerobic digestion of manioc effluents from attiéké factories. Two types of digestate were characterized, one consisting of manioc effluent + urine and another composed of manioc effluent + urine + cow dung. As a result, these residues of bio-digestion rich in nutrients (NPK) can be used as agricultural fertilizer. Moreover, the determination of some microorganisms and heavy metals digestates allowed to better appreciate its fertilizing quality. These parameters remained in accordance with the quality standards of a digestate prescribed. These results show that digestates from anaerobic co-digestion of manioc effluents, urine and cow dung can be used without fear as an agricultural biofertilizer.

Co-Digestion-Based Circular Bio-Economy to Improve Biomethane Generation and Production of Nutrient-Enriched Digestate in Bangladesh

“…This result might be contradictory with Abbas et al [15], who found that co-digestion of cow manure with food waste increased nutrient content after digestion when compared to mono-digestion. This difference in results might be due to the type of co-substrates, as Edith et al [66] also did not find significant difference in P and K contents between digestate of urine with manioc effluent and digestate of mixture of urine and cow dung with manioc effluent. This batch study showed percent increments of total nutrient after the digestion 100:0, 50:50, and 0:100 ratios were 14.39%, 21.12%, and 15.20%, respectively, compared to feedstock (Figure 6).…”

Digestate: The Coproduct of Biofuel Production in a Circular Economy, and New Results for Cassava Peeling Residue Digestate

“…represented in the table. There is a published report on ammonium, potassium, total nitrogen, and total phosphorus contents of digestate generated from co-digestion of human urine, cow dung, and cassava effluent (a mixture of peeled cassava wash water and crushed cassava juice) [92]. CPR is a solid substrate abundantly generated during production of cassava root-based food systems such as gari and starch [93].…”