城市污水深度处理与氮磷回收新工艺中试研究

Pilot-scale Study on Advanced Municipal Wastewater Treatment and Nutrient Recovery Process

研发出一种城市污水再生与氮磷回收新工艺,其以低成本有机吸附材料作为载体、以固定床吸附法为核心单元,可同时高效去除有机物、氮和磷,并可回收氮磷资源制备农用化肥。通过中试(2.2 m3/d)考察了该工艺长期运行的稳定性、再生水水质和运行成本。结果表明,该工艺能够稳定、高效地去除二级出水中的有机物、氮、磷等污染物;再生水水质基本达到了地表水Ⅱ类水体标准和工业用水、景观用水、地下水回灌、城市杂用水、农田灌溉等城市污水再生利用标准;失效再生液结晶产品可达到农业化肥合格品国家标准,实现了污染控制、资源回收的双重目的。初步估算该工艺的中试运行成本约为1.2元/m3。

A new municipal wastewater reclamation and nutrient recovery process was developed, which used low-cost organic adsorbent material as the medium and fixed-bed adsorption process as the main treatment unit. The new process could effectively remove organic matter, nitrogen and phosphorus and recycle nitrogen and phosphorus to produce agricultural fertilizer. The long-term operation stability, reclaimed water quality and operation cost of the process were investigated in a pilot-scale experiment with capacity of 2.2 m^3/d. The results showed that organic matter, nitrogen and phosphorus in the secondary effluent were steadily and effectively removed, and the reclaimed water quality met the II criteria for sur- face water. It also satisfied the requirements for industrial use, scenic environment use, groundwater re- charge, urban miscellaneous water consumption and farmland irrigation. The failed recycled liquid crystal product could meet the national standard for the qualified agricultural fertilizer. Both pollution control and resource recovery were achieved. The operational cost of the process was approximately 1.2 yuan/m^3.