Enhanced denitrification system and method suitable for high sludge concentration
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A sludge concentration and denitrification technology, applied in chemical instruments and methods, adjustment methods for biological treatment, water/sludge/sewage treatment, etc. Try to slow down, reduce the amount of sludge, and improve the effect of denitrification capacity
Active Publication Date: 2021-04-30
CHENGDU DRAINAGE CO LTD
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[0004] In view of this, in order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide an enhanced denitrification system and method suitable for high sludge concentration to achieve The AAO / AO+MBR system with a small area can meet the denitrification requirement of effluent total nitrogen less than 10mg / L
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Embodiment 1
[0067] In this embodiment, an enhanced denitrification system suitable for high sludge concentration is specifically provided. The enhanced denitrification system includes: anaerobic zone, anoxic zone, aerobic zone I, micro-anoxic zone, and aerobic zone II area and membrane pool area, such as figure 1 As shown, its specific design is as follows:
[0068] In the anaerobic zone and the anoxic zone, water inlet points are respectively provided to realize the effective utilization of carbon sources, which can increase the utilization rate of carbon sources by denitrifying bacteria.
[0069] The influent water at the inlet point passes through the anaerobic zone, the anoxic zone, the aerobic zone I, the micro-anoxic zone, the aerobic zone II and the membrane pool area, which are connected in sequence, and then denitrifies the effluent; among them, the membrane pool area is passed through The primary return flow returns the sludge to the aerobic zone I, so as to realize the return ...
Embodiment 2
[0075] On the basis of the enhanced denitrification system provided in Example 1, this example also provides an enhanced denitrification method suitable for high sludge concentration, aiming at low load of influent and unbalanced carbon-nitrogen ratio and accounting for The AAO / AO+MBR system with a small area can meet the requirement that the effluent total nitrogen is less than 10mg / L. This enhanced denitrification method includes:
[0076] The anaerobic zone, the anoxic zone, the aerobic zone I, the micro-anoxic zone, the aerobic zone II and the membrane pool area are connected in sequence, and the anaerobic zone and the anoxic zone are respectively used as water inlet points, and the membrane pool area is used as the outlet water. point and discharge point of excess sludge. During operation, the automatic control in its technological process is divided into the following parts (sorting does not represent the order of steps):
[0077] ① PAC dosing dynamic control
[0078]...
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Abstract
The invention discloses an enhanced denitrification system and method suitable for high sludge concentration, and belongs to the technical field of sewage treatment. An anaerobic zone, an anoxic zone, an aerobic zone I, a micro-anoxic zone, an aerobic zone II and a membrane pool zone sequentially communicate with one another; the dissolved oxygen concentrations of the aerobic zone I, the micro-anoxic zone and the aerobic zone II are respectively controlled through a DO self-control method; the sludge concentrations of the aerobic zone I, the micro-anoxic zone and the aerobic zone II are detected in real time so as to control the discharge amount of residual sludge in the membrane pool zone; the orp values of the anaerobic zone, the anoxic zone and the micro-anoxic zone are detected in real time so as to adjust the adding amount of a carbon source and the backflow ratio of second-stage backflow to third-stage backflow; and PID control operation is carried out through the total phosphorus target value and the total phosphorus actual value of a water outlet point so as to dynamically control PAC addition, so that the purpose of meeting the denitrification requirement that the total nitrogen content of outlet water is smaller than 10 mg/L can be achieved for an AAO/AO+MBR system which is low in water inlet load, unbalanced in carbon-nitrogen ratio and small in occupied area.
Description
technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an enhanced denitrification system and method suitable for high sludge concentration. Background technique [0002] At present, the influent water quality and water temperature of urban sewage treatment plants vary greatly. Due to the influence of seasons and residents' lifestyles, the concentration changes of influent total nitrogen (TN) and chemical oxygen demand (CODcr) are particularly significant. When the influent total nitrogen (TN) is high, the carbon-to-nitrogen ratio (C / N) is low, and the total nitrogen effluent standard is increased, it is difficult to meet the denitrification demand in the traditional anaerobic / anoxic / aerobic (AAO) process , and the consumption of carbon source is higher. [0003] In the face of changes in influent water quality concentration and water temperature, the combination of biochemical pools in a fixed mode is already d...
Claims
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