Nitrogen and phosphorus removal system and process for sewage treatment
A technology for denitrification and phosphorus removal and sewage treatment, which is applied in the field of denitrification and phosphorus removal systems and processes, can solve the problems of high biochemical treatment load, different sludges cannot be treated separately, and occupies a large area, so as to reduce construction costs and improve biological efficiency. The effect of processing power
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Embodiment 1
[0042] A kind of denitrification and dephosphorization system for sewage treatment in this embodiment, such as figure 1 as shown,
[0043] It includes a hydrolytic acidification tank, a pretreatment tank, an anaerobic tank, an anoxic tank, an aerobic tank and a magnetic separation device arranged in sequence, and the magnetic separation device is a magnetic microfiltration device or a magnetic precipitation device.
[0044] An anoxic liquid return line is provided between the anoxic pool and the anaerobic pool, and the anoxic liquid return line connects the rear section of the anoxic pool and the front section of the anaerobic pool; A sludge return pipeline is provided between the oxygen tank and the magnetic separation device.
[0045] An activated sludge separation device is arranged in the aerobic tank, an activated sludge mixed liquid return pipeline is arranged between the aerobic tank and the pretreatment tank, and a Aerobic liquid return line;
[0046] The hydrolyti...
Embodiment 2
[0048] A nitrogen and phosphorus removal process for sewage treatment in this embodiment uses the nitrogen and phosphorus removal system for sewage treatment in Example 1. In this embodiment, the type of sewage to be treated is river black and odorous water body, and the influent water quality parameters mainly include total nitrogen, ammonia nitrogen, COD, and total phosphorus.
[0049] The sewage inflow of the river is 2000m 3 / d, the designed influent water quality standard is total nitrogen ≤ 40mg / L, ammonia nitrogen ≤ 30mg / L, COD ≤ 300mg / L, and total phosphorus ≤ 4mg / L. Sewage is treated sequentially through the pretreatment pond, anaerobic pond, anoxic pond, aerobic pond and magnetic separation device.
[0050] Introduce the flocculated sludge in the pretreatment tank into the hydrolysis acidification tank, add coagulant and activated sludge for adsorption, obtain supernatant after hydrolysis and acidification, pass the supernatant through the supernatant The liquid re...
Embodiment 3
[0056] This embodiment is basically the same as Embodiment 2, and this embodiment also includes the step of collecting the pretreatment sludge generated in the pretreatment tank, the biochemical sludge generated in the aerobic tank, and the physicochemical sludge generated by the magnetic separation device. The pretreated sludge is applied to building materials. Apply the biochemical sludge to organic fertilizer. The physicochemical sludge is applied to the filter material.
[0057] The biochemical treatment system mainly includes a biochemical reaction system and a high-efficiency filtration system. The biochemical reaction system receives the small molecule organic matter produced by the pretreatment system, which improves the biodegradability of sewage at this stage and provides carbon sources for biochemical reactions. In addition, since the pretreatment system removes a large amount of inorganic substances, the content of inorganic substances entering the biochemical tre...
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