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Prepositive denitrification bio-filter processing method for municipal sewage

A pre-denitrification and urban sewage technology, applied in the field of sewage treatment, can solve the problems of high sewage treatment cost, long treatment process, and large floor area, so as to improve water treatment efficiency, reduce operating costs, and reduce floor space Effect

Inactive Publication Date: 2009-07-08
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of long treatment process, poor treatment effect, large floor area and high sewage treatment cost in the existing water treatment method, the present invention provides a treatment method for urban sewage pre-denitrification biological filter

Method used

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specific Embodiment approach 1

[0011] Specific Embodiment 1: In this embodiment, a treatment method of a pre-denitrification biological filter for urban sewage is carried out in accordance with the following steps: 1. Urban sewage passes through the coarse grid, the middle grid, the drum type fine grid, and the swirling flow in sequence. The grit chamber and the hydrolytic acidification sedimentation tank are pretreated; 2. The effluent after pretreatment and the nitrification liquid returned from the clear water tank enter the anoxic biofilter together, and the TN volume load of the anoxic biofilter is controlled to be 1 to 2.5kg / m 3 d, the ascending flow rate is 10-12m / h, the hydraulic retention time is 0.2-0.8h, the reflux ratio of the nitrifying liquid is 100-150%, the filter material in the anoxic biological filter is biological ceramsite, and the particle size of the filter material is The diameter is 6-8mm, and the thickness of the filter material layer is 2-2.5m; 3. The effluent of the anoxic biolo...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the gap of the coarse grid in step 1 is 10cm; the water depth in front of the grid of the middle grid is 0.8m, the gap is 5cm, and the flow rate through the grid is 0.57m / s ; The volume of the swirl sedimentation tank is 118m 3 , the surface load is 116.38m 3 / m 2 h, the hydraulic retention time is 40s. Other steps and processes are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step one, the maximum hydraulic load of the hydrolytic acidification sedimentation tank is controlled to be 4.7-5.8m 3 / m 2 h, the sludge concentration is 12-23g / L, and the hydraulic retention time is 2.6-2.9h. Other steps and processes are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a treatment method for a preposed municipal sewage denitrification biological filter, relates to a water treatment method, and solves the problems that the prior water treatment method has long process, poor treatment effect, large occupied area and high sewage treatment cost. The method comprises the following steps: firstly, pretreatment of municipal sewage; secondly, feeding outlet water after pretreatment and nitrified backflow liquid into a denitrification filter pool together to carry out denitrification treatment; thirdly, back feeding iron trichloride solution to carry out chemical phosphorus removal; fourthly, feeding the outlet water after denitrification into an aeration biological filter to carry out nitration treatment; and fifthly, sterilizing by ultraviolet, namely, realizing the treatment of the sewage. The method has simple process, shortens process flow, and has little occupied area, good water treatment effect and stable outlet water quality under the conditions of lower energy consumption and capital expenditure; and the water quality reaches the requirement of grade A standard of Municipal Wastewater Treatment Plant Discharge Standard prescribed by China.

Description

technical field [0001] The invention relates to a sewage treatment method. Background technique [0002] Most of the existing sewage treatment plants that have been built and operated in my country, especially urban sewage plants, use the traditional activated sludge method and its deformation process, but the traditional activated sludge treatment process is not ideal for the removal of ammonia nitrogen, and the water treatment effect Poor problem, and in the process of activated sludge treatment, a large amount of excess sludge needs to be discharged regularly. These excess sludge is full of various pollutants, and the excess sludge needs to be treated before it can be discharged, which increases the cost of sewage treatment. Cost, because the activated sludge method should not use too high organic load, so the tank volume needs to be larger, and the activated sludge method occupies a larger area. [0003] The biological aerated filter method is based on the design ideas of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F1/58C02F1/32
Inventor 韩洪军李雨霏王煨冬丛惠琴王英伟马文成胡宏博张凌瀚林杉
Owner HARBIN INST OF TECH
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