Impact of composting factors on the biodegradation of lignin in Eichhornia crassipes (water hyacinth): A response surface methodological (RSM) investigation

Biostimulation of Petroleum-Contaminated Soil Using Organic and Inorganic Amendments

“…The organic geochemical analysis revealed the following order of biostimulatory effect for TPH biodegradation: Sterilized soil + WH (93%) > SMC + WH (89%) > NPK fertilizer (86%) > WH (82%) > SMC (75%) > Control (4%) ( Figure 2 ). A similar observation was made for polycyclic aromatic hydrocarbons ( Figure 3 ), indicating that the water hyacinth composting optimization process [ 37 ] was beneficial for the enhanced remediation of crude oil-contaminated soils. The fact that non-sterilized treatments experienced less hydrocarbon degradation than the sterilized soil + WH treatment indicates that the microbes used for composting might have a hydrocarbon-degrading ability but might not have effectively thrived against potentially less-efficient indigenous microbes in the non-sterilized soil.…”

“…Based on the cellulase-producing and hydrocarbon-degrading properties of the microbes, isolate B1 was selected for the composting of water hyacinth biomass, following a series of composting optimization processes. The results of the optimization process were published in Udume, Abu [ 37 ].…”

“…Lignocellulose-degrading organisms were taken from the rumen content of cows slaughtered at an abattoir in Choba community market, Obio-Akpor LGA, Rivers State, Nigeria, and enriched using mineral salt medium (MSM). One gram of sterile powder of water hyacinth biomass, acting as the source of carbon, was aseptically transferred into a 100 mL capacity Erlenmeyer flask containing 98 mL of MSM composed of 3 g/L of NaNO 3 , 0.5 g/L of KCl, 1 g/L of KH 2 PO 4 , and 10 g/L and 0.5 g/L of 7M anhydrous FeSO 4 and MgSO 4 , respectively, adjusted to pH 6.3 [ 37 ]. The MSM was sterilized for 15 min at 120 °C, cooled, and seeded with 1 mL of rumen juice.…”

“…Based on the OD 600 values, the relative growth rates of the isolates were determined. 16S rRNA gene sequencing led to the identification of the most effective lignocellulose-degrading bacteria isolate (B1) as Chitinophaga terrae [ 37 ]. This isolate was then used for composting water hyacinth.…”

“…In view of the different circumstances requiring biostimulation and, in some cases, a combination of biostimulation and bioaugmentation, coupled with the rising need for ecofriendly and cost-effective biostimulants, the goal of this study was to examine the effectiveness of an optimized water hyacinth compost and/or spent mushroom compost to stimulate the biodegradation of crude oil-polluted soils. A lignocellulose-degrading bacteria isolate identified in Udume, Abu [ 37 ] as Chitinophaga terrae was used for the composting of water hyacinth. The resulting compost was then employed for the biostimulation of crude oil degradation.…”