Denitrification flocculating agent as well as preparation method and application thereof

• Main Authors: WANG LEI, ZHAO HUAZHANG, LI ZHENSHAN
• Format: Patent
• Language: Chinese; English
• Published: 08.10.2014
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a denitrification flocculating agent as well as a preparation method and application thereof. The denitrification flocculating agent is prepared from polysilicic acid, polyaluminum chloride and a quaternary ammonium group-containing silane coupling agent (R)3-N-Cn-Si-(R')a(OR'')(3-a)Cl, wherein R, R' and R'' are respectively alkyl groups with carbon numbers of 1-20, n is equal to 1-10, and a is equal to 0-2; the total aluminum concentration of the denitrification flocculating agent is 0.05-2mol/L, the Si/Al molar ratio is 2-5, the quaternary ammonium/aluminum molar ratio is 0.1-1, the degree of alkalization (B value ) is 0-2.5, and the pH value is 3.0-6.0. According to the invention, the flocculating agent is adopted to treat water source water containing nitrate nitrogen or sewage, so that nitrate nitrogen which is difficult to remove by virtue of the solubility and a common method can be effectively removed, the nitrate nitrogen removal cost is greatly lowered, and a sewage treatmen