首次采用不加水鲜榨甘薯，在压榨阶段得到甘薯汁，避免大量废水的产生，同时可溶性蛋白质及糖保留于薯汁中，降低了其在薯渣中的含量，避免在提取淀粉阶段产生废水中的COD浓度过高，降低了废水处理难度。清洁生产工艺分为甘薯压榨与淀粉提取2个部分。甘薯压榨试验表明，胶体磨间隙为5.0 μm，以1∶0.3(g∶mL)的料水比挤压分离薯渣2次，淀粉游离率达到最高为92.33%，薯渣中蛋白质含量降低54.16%、可溶性糖含量降低98.09%。淀粉提取工艺可分为从薯汁与薯渣中提取2部分，薯渣中淀粉提取试验表明，超声功率300 W、时间5 min预处理薯渣，可提高淀粉提取率，通过单因素与响应面试验优化薯渣浸泡条件后，浸泡料水比1∶4.9(g ∶mL)、浸泡pH值8.0、温度30 ℃、时间1 h，薯渣中淀粉提取率90.91%、产生废水量158 mL/100g甘薯，废水中化学需氧量(chemical oxygen demand，COD)质量浓度3 600 mg/L，悬浮物(suspended solids，SS)质量浓度510 mg/L，色度60倍。

In the clean production process of sweet potato starch, sweet potato juice was obtained from fresh sweet potato extrusion without adding any water to avoid producing a great deal waste water.A large amount of soluble protein and sugar were dissolved in the potato juice and therefore reduced its content in the potato residue.Thus, avoiding the high concentration of COD in the wastewater and reduced wastewater treatment.The clean production was divided into two parts: sweet potato pretreatment and starch extraction.The pretreatment experiment of sweet potato showed that the starch dissociation rate was 92.33%, protein content and sugar content in the potato residue were reduced by 54.16% and 98.09% respectively.The above results were obtained at the conditions of gel grinding interval of 5.0 μm and the ratio of sweet potato and liquid 1∶0.3, with twice residue separation.The extraction process of starch includes two parts- from the potato juice and potato residue.The results of starch extraction test in sweet potato residue showed that the extraction rate of starch could be increased by ultrasonic at power of 300 W and extracting 5 min.Through single factor test and response surface optimization, the best conclusions were: the ratio of water to solid 1∶4.9, pH 8.0, 30 ℃, extracting for 1h.Under the above conditions, the starch extraction rate was as high as 90.91%, starch wastewater is 158 mL/100g, chemical oxygen demand (COD) was 3 600 mg/L, suspended solids (SS) was 510 mg/L, the chroma was as high as 60 times.