Anaerobic ammonia oxidation strengthening process based on hydrophobic biomass charcoal

Abstract

The invention discloses an anaerobic ammonia oxidation strengthening process based on hydrophobic biomass charcoal. The required biomass charcoal is prepared from agricultural and forestry biomass wastes by a one-step method or a two-step method, the water contact angle of the biomass charcoal is 60-90 degrees, and the electron transfer / exchange capacity of the biomass charcoal per unit mass (1g) reaches 1.5-2.5 mMe <->; the biomass charcoal is crushed and screened, and is then used as an up-flow biofilter filler, secondary sedimentation tank sludge is used as seed sludge, a proper amount of anaerobic ammonia oxidation sludge is supplemented, and anaerobic ammonia oxidation biofilm culturing domestication and reactor starting are carried out; and in the stable operation period, the domestication period operation condition is adopted, if the water inlet temperature is lower than 15 DEG C, the hydraulic retention time is properly prolonged, and stable operation of anaerobic ammonia oxidation under the low-temperature condition can be ensured. The anaerobic ammonia oxidation has the advantages of strong impact load resistance, low temperature resistance, high TN removal rate and the like, and breaks through the key core problem of anaerobic ammonia oxidation engineering application.

Description

technical field [0001] The invention belongs to the field of biological treatment of environmental protection sewage, and relates to a process for strengthening anaerobic ammonium oxidation based on hydrophobic biomass charcoal, in particular to a biofilter with biomass charcoal as filler to accelerate the start-up of anaerobic ammonium oxidation Its stable operation technology under adverse low temperature conditions. Background technique [0002] Anammox (Anammox) is the use of NH under anaerobic conditions 4 + -N as NO 2 - -N denitrification of inorganic electron donors to HCO 3 - or CO 3 2- An autotrophic metabolic process for an inorganic carbon source. This process does not need to consume dissolved oxygen and organic carbon sources, and the amount of residual sludge is low. It is the most energy-saving new biological denitrification method so far, and has broad application prospects. In recent years, many new discoveries have been made in the field of theoret...

AI Technical Summary

Problems solved by technology

However, there are still the following problems: (1) Anammox bacteria are chemoautotrophic microorganisms with low production capacity, long generation time (about 11 days), and slow start-up process of the reactor

(2) The metabolic process is significantly affected by environmental factors such as temperature, and the denitrification rate and efficiency are unstable under unfavorable conditions such as low temperature (below 15°C), and large-scale engineering applications are limited

However, the preparation process of reduced graphene oxide usually requires dangerous chemicals such as strong acids and strong oxidants. The product has low density and good water dispersibility. It is easy to be washed away by water flow in continuous flow reactors, and it is difficult to maintain it in the reactor for a long time. In addition, the preparation process of reduced graphene oxide is complex, the reaction conditions are harsh, the price is expensive, and the cost of use is high, so it is difficult to achieve large-scale application in water treatment

Images