ABSTRACT
Starch-based feedstock is fermented but contains some components of feedstock and also helps in yeast cell degradation. All these substances have a high nutritive value, which contains vitamins in large amounts, proteins, and minerals; it is reported that there are particular mineral compounds present in wheat and barley stillage. The starch slurry refinement occurs through washing it in nozzle discharge centrifuges and then batch dewatering in centrifuges with a basket-like shape with about 40% moisture in them. Some equipment such as solid-bowl, scroll-discharge, and decanter centrifuges are utilized for continuous dewatering of it. The supply of a flesh dryer with starch mixed with the other dry products maintains 36% moisture. Starch is dried continuously in hot air to reduce its ability of gelatinization. The minimum moisture content required for wheat starch gelatinization is 31% and at the end of the process it contains about 10–12% moisture and 0.3% protein content. The secondary starch is produced when micro-granules of starch are dried and at the prime starch refining stage, other particulates get separated. Nozzle-type centrifuges play an important role in minimizong the insoluble material in the wastewater stream due to the huge requirement of water to wash the starch. Therefore, the present chapter summarizes the various aerobic methods for the treatment of wheat starch effluents.
