Method of integration of concentration-dehydration and aerobic air-drying of sewage sludge

US8808419B2 · kind B2 · utility

Assignee

• Guangzhou New Extend Rising Environmental Protection Technologies Machinery Equipment Co., Ltd. · CN

Inventors

• Huansheng Zhong · 流花街道, CN
• Xuewei Wu · Beijing, CN
• Jiacong Wu · 流花街道, CN
• Zhimin Sun · 流花街道, CN
• Haiying Yang · Beijing, CN

Key dates

• Filing date: Nov 18, 2009
• Grant date: Aug 19, 2014
• Expiry date: Aug 11, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E50/30
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method of integration of concentration-dehydration and aerobic air-drying of sewage sludge comprises the following steps: (a) conditioning by an organic agent (3); (b) gravitationally concentrating (5) the residual sludge conditioned by the organic agent; (c) conditioning by inorganic agents (7); (d) mechanically dehydrating (8); (e) crushing and dispersing (10); and (t) aerobically air-drying (11). The method has the following advantages: (i) to improve the sedimentation performance of the residual sludge, thus improving the concentration efficiency of sludge, reducing the concentrating time and reducing the volume of the concentrating pool; (ii) to reduce the volume of the dehydrated sludge correspondingly, thus reducing the subsequent heat treatment load; (iii) to have low energy consumption for drying; (iv) the sludge granules moving at low speed during the drying process, thus being produced stably and securely without powder; (v) the dried exhaust air can reach environmental-friendly standard discharge after being washed by water; (vi) the output sludge granules are not compact, which is good for reclamation.