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Method for treating nitrophosphate fertilizer wastewater

A technology for nitrophosphate fertilizer and wastewater treatment, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multistage treatment, etc. Low cost, low price effect

Inactive Publication Date: 2019-04-12
ZHONGBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, the technical problem to be solved by the present invention is: in the process of decomposing phosphate rock with nitric acid at present, the ammonium nitrate production wastewater is discharged through pipelines and collected by dripping and leaking. The obtained wastewater is mainly used for acid tail gas cleaning, so it needs to be adjusted with ammonia water The treatment is near-neutral, and a large amount of precipitation is produced during the process. Due to the fine particles, it is easy to produce difficult-to-filter substances to block the production device

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  • Method for treating nitrophosphate fertilizer wastewater
  • Method for treating nitrophosphate fertilizer wastewater

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Experimental program
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Effect test

Embodiment 1

[0044] (1) First analyze the wastewater components, determine the hardness of the wastewater, and measure the content of phosphate ions and fluoride ions in the wastewater;

[0045] (2) Add ammonia water to the wastewater to adjust the pH value to 3;

[0046] (3) Preparation and PO in waste liquid 4 3- Concentration (0.171mol / L) of the same magnesium nitrate (Mg(NO 3 ) 2 ) solution 1000mL, m (Mg 2 + ): m (PO 4 3- ) = 0.4;

[0047] (4) Prepare 100 mL of ferric nitrate solution with a concentration of 0.01 mol / L.

[0048] When the pH value is 3, m (Mg 2+ ): m (PO 4 3- ) ratio is not obvious for the sedimentation velocity and the sedimentation effect, but the maximum sedimentation effect of the sedimentation velocity is also very good when the ratio is 0.4, and the phosphate removal rate is 49.23%. 3+ After adjusting the pH of the wastewater with ammonia water, the pH value of the solution was 5, and the removal rate of phosphate was 73.43%.

Embodiment 2

[0050] (1) First analyze the wastewater components, determine the hardness of the wastewater, and measure the content of phosphate ions and fluoride ions in the wastewater;

[0051] (2) Add ammonia water to the wastewater to adjust the pH value to 4;

[0052] (3) Preparation and PO in waste liquid 4 3- Concentration (0.171mol / L) of the same magnesium nitrate (Mg(NO 3 ) 2 ) solution 1000mL, m (Mg 2 + ): m (PO 4 3- ) =0.6;

[0053] (4) Prepare 100 mL of ferric nitrate solution with a concentration of 0.01 mol / L.

[0054] When the pH value is 4, m (Mg 2+ ): m (PO 4 3- ) =0.6, the phosphate removal rate is 67.55%, adding Fe 3+ After adjusting the pH of the wastewater with ammonia water, the pH value of the solution was 5, and the removal rate of phosphate was 73.43%.

Embodiment 3

[0056] (1) First analyze the wastewater components, determine the hardness of the wastewater, and measure the content of phosphate ions and fluoride ions in the wastewater;

[0057] (2) Add ammonia water to the wastewater to adjust the pH value to 5;

[0058] (3) Preparation and PO in waste liquid 4 3- Concentration (0.171mol / L) of the same magnesium nitrate (Mg(NO 3 ) 2 ) solution 1000mL, m (Mg 2 + ): m (PO 4 3- ) =0.6;

[0059] (4) Prepare 100 mL of ferric nitrate solution with a concentration of 0.01 mol / L.

[0060] When the pH value is 5, m (Mg 2+ ): m (PO 4 3- ) =0.6, the phosphate removal rate is 85.86%, adding Fe 3+ After adjusting the pH of the wastewater with ammonia water, the pH value of the solution was 6, and the removal rate of phosphate was 83.25%.

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Abstract

The invention provides a method for treating nitrophosphate fertilizer wastewater. Firstly a Mg<2+> salt precipitant is prepared in a precipitant compounding tank, a solvent adopts nitrophosphate fertilizer pickling production wastewater, and a Fe<3+> salt coagulant is prepared in a coagulation compounding tank by using the nitrophosphate fertilizer pickling production wastewater. The nitrophosphate fertilizer pickling production wastewater, the Mg<2+> salt precipitant and the Fe3+ salt coagulant are added to a stirring reaction kettle in proportion, mechanical stirring is started, a solutionafter the reaction crystallization is sent to a centrifugal separator by a pump, the separated clear liquid is recycled, and a solid phase material is collected and dried in a desiccator and used as aslow release fertilizer material for struvite. The method has the advantages that after precipitation-coagulation treatment, fine particles of the nitrophosphate fertilizer pickling production wastewater are condensed into large particles, the problem of solid-liquid separation is completely solved, a trace amount of the Mg<2+> salt precipitant and the Fe<3+> salt coagulant are added, all finallyenter the solid phase of a struvite slow-release fertilizer, and do not remain in a liquid phase, the price is low, the running cost is low, after the sedimentation is completed, the wastewater is reused for industrial treatment, and a filter residue can be recycled to some extent.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating nitrophosphate wastewater. Background technique [0002] Excessive phosphorus in water will accelerate the eutrophication of water bodies. This phenomenon is more serious in our country and has brought great harm to industry, aquaculture, agriculture and tourism. The increase in the concentration of nutrients such as nitrogen and phosphorus is the cause of algal blooms, and phosphorus is the key factor. Since the formation of natural phosphate rock requires a long-term geological change process, natural phosphate rock is a non-renewable resource. With the rapid development of our country's economy, the increasing shortage of natural phosphate rock will inevitably seriously affect the production of industry and agriculture. [0003] At present, domestic and foreign wastewater phosphorus removal technologies mainly fall into two categories: bi...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01B25/45C02F101/10C02F101/16
CPCC01B25/451C02F1/5236C02F1/66C02F2101/105C02F2101/16
Inventor 赵本波程原高建峰李裕畅学华丁明公崔慧峰刘金亮魏安根李向远
Owner ZHONGBEI UNIV