Study on the fermentation effect of utilizing tofu whey wastewater and the influence of on laying hens.

BACKGROUND

Tofu whey wastewater (TWW) is the wastewater of tofu processing, which is rich in a variety of nutrients. can make full use of TWW to ferment and reproduce yeast cells, produce carotenoids and other nutrients, improve the utilization value of TWW, and reduce environmental pollution and resource waste.

METHODS

In this study, the nutrient composition changes of TWW treated by were analyzed to reformulate TWW medium, and the optimal composition and proportion of TWW medium that can improve the biomass and carotenoids production of were explored. Meanwhile, the liquid obtained under these conditions was used to prepare biological feed for laying hens, and the effect of growing on TWW as substrate on laying performance and egg quality of laying hens were verified.

RESULTS

The results showed that the zinc content of TWW after fermentation increased by 62.30%, the phosphorus content decreased by 42.31%, and the contents of vitamin B1, B2 and B6 increased to varying degrees. The optimal fermentation conditions of in the TWW medium were as follow: the initial pH was 6.40, the amount of soybean oil, glucose and zinc ions was 0.80 ml/L, 16.32 g/L, and 20.52 mg/L, respectively. Under this condition, the biomass of reached 2.23 g/L, the carotenoids production was 832.86 μg/g, and the number of effective viable yeast count was 7.08 × 10 cfu/ml. In addition, the laying performance and egg quality of laying hens fed biological feed were improved.

DISCUSSION

In this study, we analyzed the composition changes of TWW, optimized the fermentation conditions of in TWW medium, explored the influence of utilizing TWW on laying layers, and provided a new idea for the efficient utilization of TWW.