关键词:

结晶, 反硝化除磷, 脱氮除磷, 双污泥

Abstract:

A combined process of two-sludge and induced crystallization was proposed to solve some problems which exist in the traditional processes, such as lack of carbon source, SRT contradictions and low efficiencies for recovery and reuse of phosphorus.Its performance for the removal of organic substrates, phosphorus and nitrogen was investigated.The results showed that the average removal efficiencies of COD, TN, TP were 93.2%, 71.2% and 95.7%, when the concentrations of COD, TN, TP and C/N were 152—237 mg·L^-1, 3.92—7.68 mg·L^-1, 31.3—50.5 mg·L^-1 and 3.91—5.21, respectively.Among those, about 85.9% of the total COD removal was in anaerobic reactor.The share of TN removal in the anaerobic, aerobic, anoxic and post-aeration reactors was 31.7%, 11.4%, 54.9% and 2.0%, respectively, and the anoxic reactor took the most.The induced crystallization played a major role in removing phosphorus and took about 81.5% of the total removal.The main roles played by two-sludge process were denitrification and assist- chemical removal of phosphorus.Sidestream ratio was a key factor for the stable operation of two-sludge process.An important task of post-aeration reactor was to remove COD and ammonia nitrogen in bypass sludge.

Key words:

结晶, 反硝化除磷, 脱氮除磷, 双污泥