Molasses, beet utilization

The disposal of sugar beet pulp does not offer any very serious problem, since it can readily be dried and used as a cattle food and it is probable that all the available supplies are absorbed in this way. The utilization of molasses is discussed separately in Section VII. 

Preparation, The sugar is available as a by-product of the barium process for the recovery of sucrose from beet molasses (see under Sucrose) and crystallizes directly from the final molasses (158). Cottonseed meal may also be utilized by extracting the sugar with water, precipitating it as a slightly soluble compound with calcium or barium hydroxide, and removing the metal ion by carbonation (159),... 

Bednarski, W., Leman, J. and Tomasik, J. (1986) Utilization of beet molasses and whey for fat biosynthesis by a yeast. Agric. Wastes 18, 19-26. 

After establishing that valerate was the best 3HV precursor (and that propionate was no precursor). Page and co-workers [266] used the salt in combination with beet molasses to produce PHBV from strain UWD in a 2.5-L fermentor. Thirty-eight to 40 h of fed-batch regime with various valerate-addition strategies yielded 18 to 22 g copolymer L (59 to 71% of the CDM) containing 8.5 to 23 mol% 3HV. In the absence of valerate, the cells produced only PHB to 23 g L (66% of the CDM). The maximum PHA production rate was 1.1 g L h Small amounts of P(3HB-c<9-45-mol% 3HV) were produced when valerate was the only carbon source. 4-Pentenoate was also used as 3HV precursor in fermentor. The authors claim that the utilization of beet molasses as carbon source should reduce by more than half the cost of PHAs formed from glucose. 

Beet pulp represents the residue left after sucrose extraction, including the beet tops it is sold as wet pulp (85-90% water), as pressed pulp (80-85% water), dried pulp (10% moisture, 4.5% from 100 kg flesh beet). Dried pulp may be prepared as molassed pulp if disposal of surplus molasses is useftil. Utilization is mainly for animal nutrition (ruminants), including silage products with 58-60% carbohydrate equivalent and 5-6% digestible protein. 

The beets are transported during a harvest campaign of about 2 months to the sugar factory, slices of the beets are extracted and several cleaning and enrichment steps are carried out on the syrup. Byproducts of sugar manufacture are pulp and molasses (->sucrose, industry by-products) as well as waste lime, which may be used as - fertilizer. The topped leaves may be utilized as silo-feed. Depending on soil and climate about 50-100 mt of beets are produced per ha. Sugar yield is about 16% or 8-16 mt. 

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