Combined efficient dephosphorization treatment method of waste water

A treatment method and a combined technology are applied in the field of high-efficiency phosphorus removal of combined wastewater, which can solve the problems of inability to discharge wastewater up to the standard and continue to effectively remove it, so as to reduce the risk of eutrophication, simple design and operation, and realize recycling. The effect of using

Inactive Publication Date: 2019-06-21
江西中江环保集团股份有限公司
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Problems solved by technology

Although this invention solves the problem of continuous removal of low-concentration ammonia nitrogen after the wastewater is passed through the struvite precipitation method, it ca

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  • Combined efficient dephosphorization treatment method of waste water
  • Combined efficient dephosphorization treatment method of waste water
  • Combined efficient dephosphorization treatment method of waste water

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Embodiment 1

[0031] Example 1: Combined treatment of wastewater with high efficiency phosphorus removal

[0032] Experimental wastewater: The initial concentration of phosphate in the wastewater was detected to be 190.28 mg / L, the initial concentration of ammonia nitrogen was 173.91 mg / L, and the initial pH value was 6.83.

[0033] Struvite precipitation reaction: 10m of the above-mentioned nitrogen and phosphorus-containing experimental wastewater 3 , the loading volume is 15m 3 In the left and right reaction sedimentation tanks, under mechanical stirring at a speed of 200-300r / min, magnesium chloride (228.3L of 1.0wt% magnesium chloride solution) was added in a ratio of Mg:P molar ratio of 1.2:1, and 2M (2mol / L ) sodium hydroxide solution, adjust the pH value to 9.0, the nitrogen and phosphorus contained in the struvite precipitate, continue to stir for 30 minutes until the precipitation is complete, the measured residual phosphate is 4.06mg / L, and the residual ammonia nitrogen concentr...

Embodiment 2

[0040] Embodiment 2: Magnesium source addition gradient experiment in the struvite precipitation reaction

[0041] Experimental wastewater: The initial concentration of phosphate in the wastewater was detected to be 190.28 mg / L, the initial concentration of ammonia nitrogen was 173.91 mg / L, and the initial pH value was 6.83.

[0042]Struvite precipitation reaction: In 10 20L plastic buckets, respectively fill 10L of the above-mentioned nitrogen and phosphorus-containing experimental wastewater, under mechanical stirring at a speed of 200-300r / min, according to the Mg:P molar ratio of 0.5:1, 0.6: 1. Add magnesium chloride (1.0wt% magnesium chloride solution) in the ratio of 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.5:1, and add 2M hydrogen dropwise Sodium oxide solution, adjust the pH value to 9.0, the contained nitrogen and phosphorus form struvite precipitation, continue to stir for 30 minutes until the precipitation is complete, and measure the residual phosphate conc...

Embodiment 3

[0045] Embodiment 3: pH value gradient experiment in the struvite precipitation reaction

[0046] Experimental wastewater: The initial concentration of phosphate in the wastewater was detected to be 190.28 mg / L, the initial concentration of ammonia nitrogen was 173.91 mg / L, and the initial pH value was 6.83.

[0047] Struvite precipitation reaction: In seven 20L plastic barrels, put 10L of the above-mentioned nitrogen and phosphorus-containing experimental wastewater into each of them, and add them at a ratio of Mg:P molar ratio of 1.2:1 under mechanical stirring at a speed of 200-300r / min. Magnesium chloride (1.0wt% magnesium chloride solution 228.3mL), add dropwise 2M sodium hydroxide solution, adjust the pH value to 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, the nitrogen and phosphorus contained in it form struvite precipitation, continue to stir 30 minutes to precipitation completely, record residual phosphate concentration and ammonia nitrogen concentration as follows:

[0048]...

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Abstract

The invention relates to the technical field of sewage treatment and particularly discloses a combined efficient dephosphorization treatment method of waste water. The treatment method comprises the following steps: feeding a magnesium source into the waste water containing nitrogen and phosphorus to form a struvite sediment, performing primary separation to form low-concentration phosphorus-containing waste water, continuing to feed an iron source and a flocculant into the separated waste water to form a polyferric sediment, performing secondary separation to form waste water containing a little residual phosphorus, and continuing to feed steel slag into the separated waste water to form a phosphorus attached steel slag sediment, wherein the waste water after the secondary separation canreach a secondary phosphorus-containing emission standard; and the waste water after the tertiary separation can reach a primary phosphorus-containing emission standard. The method employs an organiccombination of a struvite sedimentation method, a polyferric sulfate dephosphorization method, a flocculation sedimentation method and a steel slag absorption dephosphorization method, achieves the purpose of efficient dephosphorization of the waste water, and ensures that the treated waste water can discharged to reach the standard; at the same time, the struvite sediment and the polyferric sediment are collected, dried and crushed and become an agricultural slow-release fertilizer; and resource utilization of phosphorus in the waste water is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment method for high-efficiency dephosphorization of combined waste water. Background technique [0002] The entry of phosphorus-containing substances into water bodies can lead to eutrophication, and phosphorus is an essential nutrient element for animals and plants. In addition, phosphorus is a non-renewable valuable mineral resource that is becoming increasingly scarce. Therefore, recovering phosphorus from high-concentration phosphorus-containing wastewater is an effective way to solve water phosphorus pollution and resource shortage. [0003] At present, the chemical coagulation precipitation method is the earliest and most widely used phosphorus removal method. The basic principle is to form insoluble phosphate precipitates by adding chemicals, and then remove them from wastewater by solid-liquid separation. Commonly used precipitants mainly i...

Claims

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Application Information

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IPC IPC(8): C02F9/04C05F3/02C05B17/00C02F101/10C02F101/16
CPCY02A40/20
Inventor 黎慧娟孙丽萍万春
Owner 江西中江环保集团股份有限公司
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