Efficient, energy-saving and consumption-reducing sewage treatment method for resource recovery

Abstract

The invention relates to an efficient, energy-saving and consumption-reducing sewage treatment method for resource recovery. Inflow sewage and return sludge are sufficiently mixed in an activated sludge adsorption tank, most carbon and a small part of nitrogen in the sewage are transferred to the return sludge, effluent enters a settling pond for solid-liquid separation, clear water and residual sludge are drained, the residual sludge enters an efficient anaerobic digestion reactor, hydrogen or biogas and digested sludge are obtained, biogas slurry produced after dewatering of the digested sludge is conveyed into a fluidized bed reactor provided with a settling zone through MAP (magnesium ammonium phosphate), and part of residual biogas slurry obtained with an MAP method and clear water drained from the settling pond enter an anaerobic ammonium oxidation, denitrification and oxidation system respectively for denitrification; or, the clear water drained from the settling pond and the biogas slurry are merged, and denitrification treatment is performed through dominant algae and nitrogen-fixing bacteria; dominant algae adopt chlorella; finally, water is discharged. Carbon, nitrogen and phosphorus elements in sewage can be comprehensively utilized, and the method has the advantages of energy outward transportation, phosphorus recovery, low nitrogen transformation energy consumption or nitrogen recovery, greatly shortening of the reaction time and the like.

Description

technical field [0001] The invention relates to the field of denitrification and dephosphorization of sewage, and is a method mainly based on microbial enrichment, advanced anaerobic digestion (mainly referring to high-solid anaerobic digestion, TS>10%), magnesium ammonium phosphate (MAP) precipitation and anaerobic ammonium A sewage treatment method with high efficiency, energy saving, consumption reduction and resource recovery combined with oxidation or nitrogen fixation. Background technique [0002] The water resource crisis has become one of the greatest challenges faced by human beings in the 21st century. The existing sewage treatment plants in my country are mainly aimed at organic carbon pollutants, and the removal effect of nitrogen and phosphorus elements is poor, and nitrogen and phosphorus are the main causes of water pollution. The main nutrient for eutrophication. [0003] The existing biological denitrification and phosphorus removal processes all adopt t...

AI Technical Summary

Problems solved by technology

The optimal conditions of each microbial population are different, so it is impossible to maximize the simultaneous removal of nitrogen and phosphorus

In particular, nitrifying bacteria have the characteristics of no need for organic carbon sources, low growth rate, long generation period, and difficu

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