Study On Method Of Recirculation And Reclamation Of Rice Milk

Methods of rice milk recirculation and reclamation were studied. Three methods of defecating rice milk whose lactic acid was less than 2.3g/L in producing common yellow rice wine and whose lactic acid was about 2.3g/L in producing traditional yellow rice wine were used according to yellow rice wine enterprises in our country. This is very important in developing national yellow rice wine industry, not only because water resource has fully been used and developed, but also because environment has been protected in the hand offish and rice.In the first chapter, the source and pollution to environment and treatment of rice milk had been discussed. Wastewater treatment with flocculation, adsorption and ion exchange in China and foreign countries was reviewed.Rice milk treatment by flocculation with FeSC? was studied in the second chapter. FeSC>4 flocculant with lime-milk condtioning pH was fit to rice milk whose degree of acidity (lactic acid g/L) was less than 2.3g/L. The results showed that the light transmittance of clear liquor was above 90.0% when pH was 8.0, the dosage of FeSC>4 1.4 mg/L, the stir speed 60rpm, and the stir time 5min.In the third chapter, the treatment technology which defecated rice milk by adsorption with celite and activated carbon and mechanisms of activated carbon adsorbing protein had been investigated. This method was fit to rice milk whose degree of acidity was about 6.0g/L.Conclusions showed that light transmittance of clear liquor was above 85.0% , the removal rate of amino acid was 42.6%, the removal rate of protein was 60.0%, and removal rate of total sugars was 71.1%, when pH value was 8.0, dosing amount of celite being 6.0g/L,dosing amount of free activated carbon being 8.0g/L,and adsorption time being 30min.In the forth chapter, the rice milk treatment by ion exchanger and mechanisms of 732 resin adsorbing protein had been studied. The results showed that the optimal technological conditions were that pH was 7.0, absorption rate 2ml/min籧m2, and at this time ,the adsorption capacity of the resin to protein was 186.2mg/g. Resin was regenerated by HaSC^ of 0.7mol/L, and desorption rate of protein was 70.25%(average). Adsorption isothermal of resin to protein met Freundlich isotherm, and rate equation met Banearmu. Total coefficient of mass transfer was 2.2 x 10"3 s'1 ,and effective diffusion parameter was 3.1 x 10"9cm2/s.In the fifth chapter, the feasibility of the methods of rice milk recirculation and reclamation had been discussed. Compared with brewing yellow rice wine with rice soaked by water, the experiments with 7-time circulation method showed that the time needed for soaking the rice could be shortened with degree of acidity of the rice milk reached ahead, amino acid and protein soaked out from the rice in clear liquor being as much as those in tap water. The yellow rice backbone wine met the yellow rice wine standards GB/T13662-2000 and the Shaoxing wine standards GB17946-2000 by soaking rice with rice milk defecated circularly and by brewing yellow rice wine with rice soaked by the clear liquor and organics recovered from rice milk. The water recovery from rice milk was about 70%.