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Sewage treatment system and application thereof

A technology of sewage treatment system and strains, which is applied in the field of systems using activated sludge method to treat wastewater, can solve the problems of dissolved oxygen consumption, complicated operation and maintenance, increased operation energy consumption, etc., to reduce the impact of temperature and other factors, reduce Investment and operating costs, the effect of improving ammonia nitrogen processing capacity

Active Publication Date: 2014-05-14
启迪浦华(开封)水业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two deficiencies in the above method: first, increasing the sludge concentration in the biochemical tank not only increases the number of nitrifying bacteria, but also increases the number of heterooxygen bacteria such as decarburizing bacteria, but the ratio of nitrifying bacteria does not increase
The competitive utilization of dissolved oxygen by heterotrophic bacteria such as decarburizing bacteria is greater than that of nitrifying bacteria, and a large amount of dissolved oxygen is consumed by heterotrophic bacteria such as decarburizing bacteria, resulting in energy waste
Second, high investment and operating costs
Membrane bioreactor construction investment is high, and due to the need to turn on vacuum pumps and other equipment, the operating energy consumption is much higher than that of conventional treatment processes, and operation and maintenance are more complicated; to increase the sludge return ratio, it is necessary to increase the return sludge pump power, which will also increase Operating energy consumption

Method used

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  • Sewage treatment system and application thereof
  • Sewage treatment system and application thereof
  • Sewage treatment system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: sewage treatment system

[0035] see figure 1 with figure 2 . The biochemical pool (CASS pool) is divided into two parts along the water inlet direction, the anoxic zone 7 at the front end and the aerobic zone 8 at the rear end. Anoxic zone 7 is 20m wide, 5m deep, and has a volume of 750m 3 , with two submersible mixers 1; the aerobic zone 8 is 20m wide, 5m deep, and has a volume of 4250m 3 , there is a return sludge pump 2, a residual sludge pump 4 and a decanter 5, and the decanter 5 has a decanting capacity of 1700m 3 / h, with aerator 3 at the bottom ( figure 1 The multiple circles in the figure indicate the aeration head). The aerator 3 is blown by a blower 9 .

[0036] The main body of the strain activation device 10 is a plastic barrel (container) with a volume of 1m 3 (1m*1m*1m), each time can handle 1m of water 3 . Discharge 0.5m into the aerobic zone 8 of the biochemical pool each time 3 muddy water mixture. The strain activation device...

Embodiment 2

[0039] Embodiment 2: the treatment of sewage

[0040] Taking the urban domestic sewage treatment project in a certain county as an example, the effect of this scheme on treating ammonia nitrogen in low-temperature domestic sewage was tested. In order to compare the technical effects of the present invention, a comparative test is carried out simultaneously. The comparison test site is selected in the county's urban sewage treatment plant. The main body of the plant adopts the CASS process, and the raw water is mainly domestic sewage in the county. During the comparative test, the concentration of raw water pollutants is shown in Table 1.

[0041] Table 1: Raw water quality indicators (unit: mg / L)

[0042]

[0043] Table item, COD Cr is the chemical oxygen demand measured by using potassium dichromate as the oxidant; SS is the content of suspended solids; TN is the total nitrogen; TP is the total phosphorus.

[0044] The operating parameters of the CASS tank are as foll...

Embodiment 3

[0058] Embodiment 3: the treatment of sewage

[0059] The activated strains added daily in the post-processing stage are per 0.35 liters of ammonia-nitrogen strains, adding raw water to make 0.5m 3 muddy water mixture. The jet aeration device was turned on for 26 hours, and the dissolved oxygen in the mud-water mixture in the container was controlled to 4mg / L.

[0060] During the operation period, maintain the ammonia nitrogen bacteria species in the biochemical pool at 3ml / m 3 . Other processing methods and equipment are the same as in Embodiment 2. Reach and embodiment 2 same processing effect.

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Abstract

The invention provides a sewage treatment system comprising a biochemical pool, wherein the biochemical pool is divided into an anoxic region and an aerobic region; the anoxic region is provided with a raw water inlet and at least one stirrer; the aerobic region is provided with an aerator, a water decanter, an activated strain inlet, a residual sludge outlet and a water outlet; the lower part of the biochemical pool is provided with a returned sludge pipeline. According to the invention, a CASS (Commanded Active Sonobuoy System) pool is used as the biochemical pool, so that the sludge is effectively intercepted, and the sludge loss is reduced. By using the device and method provided by the invention, the ammonia nitrogen treatment capacity of the biochemical pool can be rapidly improved, the impact caused by factors such as temperature and the like can be reduced, and the effluent quality can be stabilized. Due to the adoption of a way of adding enough strains to the required concentration once and replenishing a small amount of strains many times to maintain the concentration of the strains, the proportion of nitrobacteria in activated sludge can be increased within short time. Under a low temperature condition, the concentration of ammonia nitrogen in effluent of the sewage treatment system provided by the invention is lower than that of a traditional treatment system.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to a system for treating wastewater using an activated sludge method and an application thereof. Background technique [0002] Biological denitrification process is widely used in urban domestic sewage treatment. Under aerobic conditions, nitrifying bacteria oxidize ammonia nitrogen in water to nitrate to achieve the removal of ammonia nitrogen. Under normal temperature conditions, the biological denitrification process has the advantages of high ammonia nitrogen treatment efficiency and stable process operation. Among them, CASS method is the abbreviation of circulating activated sludge method. The CASS reaction tank is designed into two parts along the length of the tank, the front part is anoxic zone, and the rear part is an aerobic zone. A liftable automatic water skimming device (decanter) is installed at the rear of the aerobic zone. The processes of water intake, aerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34C02F101/16
Inventor 李星文孙晓虎王英彪赵光吉李子言
Owner 启迪浦华(开封)水业有限公司