关键词: 碳回收, 碳捕获, 捕获率, 高负荷活性污泥法, 絮凝, 膜分离

Abstract: Nowadays, the problem of high energy consumption and carbon emission during the organic matter removal in municipal wastewater treatment plant becoming increasingly obvious. Subsequently, the concept of organics recovery, which has both environmental and economic profits, attracted more and more attention. Efficient capture of organic matter from low-intensity municipal wastewater to generate high concentration organics, determines the economic and technical feasibility of organics recovery. Many well-known water treatment processes, such as membrane filtration, high-loaded activated sludge process, flocculation, have been re-recognized and applied to organics capture due to their high organic matter retention characteristics. In this paper, according to the concentration process of organic matter in these technologies, they were divided into two categories: "directional aggregation" and "passive accumulation". Based on understanding their capture mechanism, this paper further discusses the approaches to improve their capture efficiency and short slabs that need to be overcome for the large-scale application. Then, this paper summarizes the recovery methods of the concentrated organics, and pointed out that the key of maximum recovery is to select the appropriate pretreatment according to the characteristics of concentrated organics. Finally, based on the technology maturity, energy consumption and operation cost of organics capture process, the feasibility of wastewater treatment system aiming at resource recovery was prospected.

Key words: organics recovery, organics capture, capture efficiency, high-loaded activated sludge process, flocculation, membrane filtration