Anaerobic ammonia oxidation strengthening process based on hydrophobic biomass charcoal

An anaerobic ammonia oxidation and biomass carbon technology, which is applied in anaerobic digestion treatment, water pollutants, biofuels, etc., can solve the problem of slow reactor start-up process, unstable denitrification rate and efficiency, and good water dispersibility, etc. problems, to achieve the effect of improving electron transfer rate and denitrification efficiency, fast start-up and stable operation, and rich surface functional groups

Active Publication Date: 2021-11-23
HANGZHOU DIANZI UNIV
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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

Method used

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  • Anaerobic ammonia oxidation strengthening process based on hydrophobic biomass charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Waste bamboo was used as raw material to prepare biochar, which was broken into small pieces of 0.5-2 cm and then dried at 60°C for 48 hours. A tube furnace was used to prepare biochar in one step. The pyrolysis temperature was 400 °C, the heating rate was 5 °C / min, and the holding time was 10 h. Nitrogen was used for anoxic protection during the pyrolysis process.

[0038] The water contact angle (θ) of the biochar prepared by the above-mentioned one-step method is 62°, and the electron transfer / exchange capacity (EEC) per unit mass of biochar (1g) is 2.46mM e - . After sieving the biochar, biochar particles with a particle size of about 3 mm were obtained, soaked in water for 24 hours, loaded into an upflow anaerobic biofilter, and inoculated with a certain A 2 / O The secondary sedimentation tank of the sewage plant concentrates the sludge, and supplements the anaerobic ammonium oxidation flocculent sludge according to 20% (mass ratio) of the inoculated sludge amoun...

Embodiment 2

[0040] Waste corn stalks are used as raw materials, broken into small pieces of 3 to 5 cm, and then dried at 45 ° C. Biochar is prepared by a two-step method. (1): High-temperature pyrolysis was carried out in a tube furnace, the pyrolysis temperature was 700°C, the heating rate was 10°C / min, and the holding time was 1h. During the pyrolysis process, argon gas was used for anoxic protection. (2): The biochar obtained in step (1) is crushed and sieved to obtain biochar particles with a particle diameter of about 5mm, and the biochar is obtained by H 2 SO 4 +HNO 3 modified, H 2 SO 4 with HNO 3 The mass ratio is 0.5:1, the modification time is 3h, and then put back into the tube furnace, in H 2 / N 2 under protection (H 2 The volume content is 5%) for partial reduction reaction. The reaction conditions are: heating rate 20°C / min, reduction temperature 400°C, holding time 1.0h, so that the surface has proper hydrophobicity and high electron transfer ability.

[0041] The wa...

Embodiment 3

[0043] Waste pine wood was used as raw material to prepare biochar, which was broken into small pieces of 2-4 cm and then dried at 100°C until constant weight. Using a tube furnace, a one-step method was used to prepare woody biomass charcoal. The pyrolysis temperature was 500 °C, the heating rate was 15 °C / min, and the holding time was 8 h. During the pyrolysis process, argon gas was used for anoxic protection.

[0044] The water contact angle (θ) of the biochar prepared by the above one-step method is 87°, and the electron transfer / exchange capacity (EEC) per unit mass of biochar (1g) is 1.52mM e - . The prepared biochar was sieved to obtain granular biochar with a particle size of 4-5 mm. After soaking in clean water for 48 hours, it was loaded into an upflow anaerobic biofilter, and inoculated with concentrated sludge from a secondary sedimentation tank of an oxidation ditch sewage plant. According to 10% (mass ratio) of the amount of inoculated sludge, anaerobic ammonium...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C10B53/02C10B57/08C10B57/10C02F101/16
CPCC02F3/28C02F3/2826C10B53/02C10B57/08C10B57/10C02F2305/06C02F2101/16C02F2209/44Y02E50/10
Inventor 黄进刚刘静雅施彬芳姚志通韩伟
Owner HANGZHOU DIANZI UNIV
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