Bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and method

Abstract

The invention provides a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment method for solving the frequency problems of high sand content in incoming water, low volatile suspended solid (VSS) / mixed liquor suspended solids (MLSS), inadequate carbon source and the like in the conventional denitrification and dephosphorization process. The system consists of a main waste water treatment system having denitrification and dephosphorization functions and a bypass system, wherein the main waste water treatment system comprises a grit chamber and a waste water treatment system having denitrification and dephosphorization functions; and the bypass system consists of a hair separator, a sludge reduction pool, a sludge and silt separator, a silt dewatering system and a chemical dephosphorization system. In the invention, by discharging the sludge and silt and retaining slit organic matters, the silt is prevented from depositing in the waste water treatment system and the VSS / MISS ratio of the sludge in a biochemical reaction pool is improved. By returning the sludge recycled as a carbon source, a carbon source is provided for the main waste water treatment system. By applying chemical dephosphorization in the embedded bypass system, the phosphorus in urban waste water can be removed and recycled chemically at low cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to an integrated sewage treatment system and method for embedded bypass sludge reduction, sludge and silt separation, nitrogen and phosphorus removal, and is suitable for influent with high sediment content, VSS / MLSS Phosphorus and nitrogen removal in sewage treatment plants with low and insufficient carbon sources. Background technique [0002] In recent years, with the growth of urban sewage production and the improvement of treatment rate, the amount of residual sludge, a by-product of sewage treatment, has also increased rapidly. The problem of sludge treatment and disposal is highlighted. Faced with the continuous generation of sludge, the traditional end-of-sludge treatment and disposal methods have been questioned in terms of technology, economy, and environmental safety. Under such circumstances, the development of sewage treatment technology with low sludge yield i...

AI Technical Summary

Problems solved by technology

At present, there are mainly the following problems in terms of sludge reduction technology: (1) As far as the research on sludge reduction technology is concerned, many studies are currently in the exploratory demonstration stage of laboratory experiments. There are few quantitative engineering demonstrations; there are some differences and uncertainties in the research conclusions

(2) There is a contradiction between sludge reduction and traditional biological phosphorus removal

The purpose of sludge reduction is to reduce the amount of excess sludge. The better the effect of sludge reduction, the less excess sludge can be removed by biological phosphorus removal, and the phosphorus removal capacity will decrease or even disappear completely. Therefore, sludge reduction The quantity cannot ensure the good removal of nutrients in sewage, especially phosphorus; this is also the reason why the effluent quality of all sewage treatment processes using sludge reduction technology fluctuates and does not meet the standards

(3) It is not possible to enrich and recover low-concentration phosphorus in sewage in the form of non-excess sludge (4) With the reduction of excess sludge discharge, inert inorganic substances such as sand must accumulate in the sewage treatment system, so that The content of inorganic substances in activated sludge accumulates in the biochemical aeration tank, resulting in a reduction in the reaction efficiency and effective volume of the aeration tank. The serious impact on the normal operation, management and maintenance of the sewage plant has become increasingly prominent, and may even lead to sludge Loss of process reduction function

As far as the current sand removal technology is concerned, its sand removal concept is focused on source removal. Although the effect of removing silt can be achieved, some carbon sources will inevitably be lost, making the problem of insufficient carbon sources more prominent.

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