Effect of Adding De-Oiled Kitchen Water on the Bioconversion of Kitchen Waste Treatment Residue by Black Soldier Fly Larvae

Zhuojun He, Cheng Yang (), Yan Peng, Taoze Liu, Zhanghong Wang and Chengcai Xiong
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Zhuojun He: College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Cheng Yang: College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Yan Peng: College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Taoze Liu: College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Zhanghong Wang: College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Chengcai Xiong: Zunyi Meijing Technology Co., Ltd., Zunyi 563000, China

IJERPH, 2023, vol. 20, issue 3, 1-14

Abstract: With the continuous development of society, the output of kitchen waste (KW) is fast increasing. De-oiled kitchen water (DKW) and kitchen waste treatment residue (KWTR), two main by-products of the KW treatment industry, are produced accordingly on a large scale. The need to develop an effective technique for the utilization of DKW and KWTR is attracting wide attention. In the present study, black soldier fly larvae (BSFL) were employed as a biological treatment method to treat KWTR with the addition of DKW. The influence of DKW (0–140 mL) on the efficiency of BSFL treatment evaluated by the growth and development of BSFL, the body composition of BSFL, the nutrient content of bioconversion residue (BR), and the bioconversion efficiency of KWTR, was investigated. The results showed that the growth and development of BSFL, the body composition of BSFL, and the conversion rate of KWTR were initially promoted and then inhibited with the addition of DKW. Notably, the amount of DKW added in the T110 group was the most suitable for the growth of BSFL and the accumulation of body composition. Compared with the blank comparison group, the content of crude protein (CP), crude ash (CA), salinity, total phosphorus (TP), and dry matter (DM) of BSFL in the T110 group increased by 3.54%, 6.85%, 0.98%, 0.07% and 2.98%, respectively. However, the addition of DKW could steadily increase the nutrient content of BR, with the highest amount at 140 mL DKW. Following DKW addition, the contents of CP, ether extract (EE), crude fiber (CF), organic matter (OM), total nitrogen (TN), TP, and total potassium (TK) were increased by 4.56%, 3.63%, 10.53%, 5.14%, 0.73%, 0.75%, and 0.52%, respectively, compared with those of the blank comparison group. The study showed that DKW could be used as a nutrient additive in the bioconversion process of KWTR by BSFL, which provided a new method for the resource utilization of DKW.

Keywords: black soldier fly larvae; de-oiled kitchen water; sorghum straw; bioconversion; kitchen waste treatment residues (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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