Common problems of sludge treatment- Abnormal dissolved oxygen
Source：Jiangsu Envset Time:28 October 2020
The dissolved oxygen value is a basis for studying the self-purification ability of water. The dissolved oxygen in the water is consumed, and it takes a short time to return to the initial state, which indicates that the water body has strong self-purification ability, or that the water body pollution is not serious. Otherwise, it means that the water body is seriously polluted, the self-purification ability is weak, or even the self-purification ability is lost. In wastewater treatment and sludge treatment, what methods should we take to deal with when the dissolved oxygen is abnormal? The following will briefly introduce the cause analysis of the abnormal dissolved oxygen.
Dissolved oxygen monitoring in operation mainly relies on online monitoring instruments, portable dissolved oxygen meters and experimental determinations. There are three methods of monitoring. The instrument needs to frequently compare the experimental measurement results to ensure that the instrument is accurate. When abnormal dissolved oxygen occurs, multi-point sampling should be adopted in the aeration tank to analyze the cause of the failure by measuring the dissolved oxygen concentration in different areas of the aeration tank.
(1) Relationship with raw water composition. The influence of raw water on dissolved oxygen is mainly reflected in the fact that large water volume and high organic concentration will increase the oxygen consumption of the system. Therefore, after the aerator is fully opened in operation, it is necessary to increase the water intake according to the dissolved oxygen situation. In addition, if there are more detergents in the raw water, the liquid surface of the aeration tank has an isolation layer to isolate the atmosphere, which will also reduce the oxygen flushing efficiency.
(2) Relationship with sludge concentration. The higher the sludge concentration, the greater the oxygen consumption. Therefore, it is necessary to control the appropriate sludge concentration during operation to avoid unnecessary excessive oxygen consumption. At the same time, it should be noted that when the sludge concentration is low, the aeration rate should be adjusted to avoid excessive oxygen flushing and cause sludge decomposition.
(3) The relationship with the settlement ratio. What to avoid during operation is over-aeration. Excessive aeration will cause small air bubbles of the sludge to adhere to the sludge, causing the sludge to float up, increase the sedimentation ratio, and a large amount of scum on the surface of the sedimentation tank.
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