High-efficiency dense-medium coagulating sedimentation water treatment process

A technology of coagulation, sedimentation and heavy media, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of long residence time and occupying land, and achieve the effect of improving recovery rate, saving civil construction cost and shortening construction period.

Inactive Publication Date: 2014-04-09
PACIFIC WATER TREATMENT ENG
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  • Abstract
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Problems solved by technology

[0003] The coagulation and sedimentation process is an indispensable part of water treatment in the current water supply, but the traditional sedimentation process has a long residence time, such as the upward flow velocity of the advection sedimentation tank is 0.5-1.5m / h, and the faster inclined plate sedimentation The pool is only 10-15m / h, which makes this process section occupy a large proportion of land in the waterworks

Method used

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  • High-efficiency dense-medium coagulating sedimentation water treatment process

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Effect test

Embodiment 1

[0021] The raw water samples are taken from the sampling port of a waterworks in the lower reaches of the Yangtze River. The dense medium coagulation process used is as follows: first, polyaluminum chloride (PAC) is added to the raw water to a concentration of 8mg / L (based on a density of 1.24g / ml liquid Polymerized AlCl 3 After mixing evenly, add polyacrylamide (PAM) to a concentration of 0.1mg / L, the amount of heavy medium added during coagulation is 100mg / L, the entire reaction time is 4min, and the water is discharged after 2min of precipitation. In order to investigate the stability of the process, the above process was run for 2 months, and the result of the operation is shown in the figure: During the operation period, the raw water turbidity range is 71-107NTU, COD Mn The range of change is 3.4-4mg / L ( figure 2 with image 3 The effluent turbidity during the whole operation period can be stabilized at <2NTU, the COD can be stabilized at about 2.4mg / L, and the remova...

Embodiment 2

[0025] Table 2: Comparison of turbidity removal performance of different raw water by dense medium coagulation sedimentation process

[0026]

[0027] Remarks: PAC dosage is 8mg / L, PAM dosage is 0.1mg / L, ①-test temperature is 1-2℃, ②-test temperature is 30℃

[0028] In order to investigate the treatment effect of the dense medium coagulation sedimentation process on different water sources: the raw water NTU ranges from 15.9 to 423, and the temperature range is 1°C-30°C (except for the notes, the rest of the treatment temperature is 15-25°C ambient temperature) . As shown in Table 2, the dense-medium coagulation-sedimentation process has a very high impact resistance. In the case of constant dosage, the turbidity of the effluent can be maintained stably no matter in the face of low-temperature low-turbidity or high-turbidity source water. under 2. In addition, the process has no effect on COD MnThe removal rate is kept stable at about 35%, within the range of this experi...

Embodiment 3

[0030] Table 3: Treatment performance comparison of dense medium coagulation sedimentation process / sand flocculation sedimentation process / conventional flocculation sedimentation process

[0031]

[0032] Remarks: PAC dosage is 8mg / L, PAM dosage is 0.1mg / L

[0033] The treatment effects of the density medium separation process, sand addition and conventional flocculation process on the raw water of the Yangtze River are shown in Table 3: under the same operating parameters, the deturbidity and COD removal effect of the dense medium coagulation sedimentation process is significantly better than that of Sand addition and conventional process, which fully demonstrates the advantages of fast and efficient dense medium separation process. Compared with adding sand, the effect of the dense medium powder used in the process of the present invention is better, this is mainly because the density of the dense medium (~4.5g / cm 3 ) than the density of sand (~2.2g / cm 3 ) is larger, an...

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Abstract

The invention discloses a high-efficiency dense-medium coagulating sedimentation water treatment process. The high-efficiency dense-medium coagulating sedimentation water treatment process mainly comprises a water tank, a submersible pump, a coagulating tank, a sludge tank, a stirrer, a dense medium automatic feeding device, a primary separator, a secondary separator, a dense medium mixing reaction tank, a dosing pump, a dosing tank, a curing tank, a deflocculating machine, a sludge pump, a rapid sedimentation tank, a sludge pipe, a pipeline mixer and the like, wherein the raw water tank is connected to a flocculating reactor through a pipeline of the submersible pump; the flocculating reactor comprises the coagulating tank, the dense medium mixing reaction tank and the curing tank which are sequentially communicated with one another; the flocculating reactor and the rapid sedimentation tank are connected with each other through a pipeline; the excess sludge at bottoms of the flocculating reactor and the rapid sedimentation tank is connected to a dense medium recovery system through pipelines; a dense medium enters the flocculating reactor through the pipeline after the recovery is completed so as to form circulation. The process disclosed by the invention has the characteristics of land using area and civil engineering cost saving, relatively high stability of water treatment effect, cyclic utilization of the dense medium and the like.

Description

technical field [0001] The invention relates to the technical field of water treatment technology, in particular to a high-efficiency dense medium coagulation sedimentation water treatment technology. Background technique [0002] In recent years, with the continuous improvement of my country's urbanization level and the aggravation of water environment pollution, urban water supply is facing the double challenge of ensuring quality and quantity, followed by the expansion of urban water supply facilities and technological transformation. Expansion and transformation mean more land use and more efficient water treatment processes. For my country, where cultivated land resources are becoming more and more precious, the development of new compact and efficient water treatment processes is obviously imminent. [0003] The coagulation and sedimentation process is an indispensable part of water treatment in the current water supply, but the traditional sedimentation process has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
Inventor 范青如杨志宏梅从明冯金荣秦爱冬贾伯林薛开泉乔春光陈莉周圆圆徐尔东达云祥殷亚东
Owner PACIFIC WATER TREATMENT ENG
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