Dedicated flocculant for separating micromolecular organic matters from potato starch wastewater

• Main Authors: LI HONGZHOU, YUAN JING, SHAO JIXIN, FENG QIBIAO, LI WENBIN, WANG YINXUAN, ZHANG XINYU, SI SHUANGLONG, TIAN BINSHOU, YANG LEIJUN, MENG YUAN
• Format: Patent
• Language: Chinese; English
• Published: 09.03.2016
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention provides a dedicated flocculant for separating micromolecular organic matters from potato starch wastewater. The dedicated flocculant is composed of the following components in percentage by weight: 25 to 30% of chitosan, 10 to 15% of aluminum sulfate, 10 to 15% of iron chloride, 18 to 22% of polyacrylamide, 8 to 12% of acetic acid, 8 to 12% of poly(aluminum chloride), and 8 to 12% of alum, wherein the total mass percentage is 100%. The organic substances and inorganic substances are compounded together, the components generate a synergetic effect, and the flocculating effect is prominently improved. Through only one flocculent precipitation, the COD (chemical oxygen demand) concentration of potato starch wastewater is reduced from 1000 to 2000 mg/L to 200 to 300 mg/L, and the COD elimination rate can reach 80% or more. The processed wastewater is clear and transparent, and does not have odor. The COD index reaches the national standard. The processed wastewater can be used to wash the potatoes