Method for removing sewage ammonia nitrogen by employing active sludge oxidation ditch technique
A technology of activated sludge and oxidation ditch, which is applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc. problem, to achieve the effect of low price, low overall cost and improved removal rate
Active Publication Date: 2009-12-30
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The introduction of nitrifying bacteria from the outside can indeed ensure the smooth progress of the nitrification process in a relatively short period of time, but the operation and management are very inconvenient and the cost is relatively high, and the applicability of this method is not wide, such as for discharge It is not very suitable for large amount of industrial sewage treatment
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1～10
[0022] After the sewage is preliminarily precipitated to remove solid impurities, the water quality is adjusted to: water temperature 10-25°C, pH value 7-9, alkalinity 200-350mg / L, BOD 5 Load less than 0.1kgBOD 5 / (kgMLVSS·d).
[0023] The structure of the oxidation ditch for sewage treatment is a three-ditch oxidation ditch, which are nitrification area, denitrification area and sedimentation area respectively, and are connected in series in the above order, with a total volume of 87000m 3 .
[0024] The process conditions of nitrification, denitrification and precipitation areas are controlled as follows:
[0025] Nitrification zone: sludge concentration 2-4g / L, sludge age 10-25d, dissolved oxygen concentration 2-5mg / L, hydraulic retention time 8-12 hours;
[0026] Denitrification zone: sludge concentration 2-4g / L, sludge age 10-25d, anaerobic state, hydraulic retention time 2-4 hours;
[0027] Sedimentation zone: The hydraulic retention time is 2 to 4 hours.
[0028] S...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an activated sludge oxidation ditch craft to remove ammonia nitrogen of waste water, which comprises the following steps: proceeding preliminary sedimentation; removing solid impurity; entering into oxidation ditch; existing at least one nitrated zone, denitrifying zone and settling zone in the oxidation ditch; making the waste water enter into the nitrated zone; cycling through each zone; discharging with the same quantity supernatant fluid of the settling zone; adding a nitrated bacterium cultural accelerant into the nitrated zone; setting the adding quantity at 5-20 mg / L; allocating the component of the accelerant as 100 wt molasses, 0. 2-2. 5 wt metal salt and 1-8 wt adsorbent; allocating the metal salt as A and B; allocating the A as MnSO4 or MnCl2; allocating the B as MgSO4 or CaCl2 or mixture of two; setting the mole ratio at 10:(0. 5-5); setting the adsorbent as one or two of zeolitic powder, diatom earth, powdered activated charcoal or coal ash.
Description
technical field [0001] The invention relates to a method for removing ammonia nitrogen from sewage through nitrification and denitrification processes by adopting activated sludge oxidation ditch technology. Background technique [0002] Ammonia nitrogen is the most harmful pollution factor in water bodies. It will lead to eutrophication of rivers and lakes and weaken the self-purification ability of water bodies. Ammonia nitrogen in polluted water usually refers to nitrogen existing in the form of ammonia. Compared with other organic pollutants, it is much more difficult to remove ammonia nitrogen in polluted water. In the prior art, the removal methods of ammonia nitrogen in polluted water mainly include physical, chemical and biological methods. Physical or chemical methods include air stripping method, break point chlorination method, ion exchange adsorption method, flocculation precipitation method, electrodialysis method, catalytic wet oxidation method, liquid membran...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 吴敏仓一华祝娟芝杨玉梅
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD