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Treatment method of nitrogen and phosphorus-containing waste water

A treatment method and wastewater technology, which are applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problem that it is difficult for the biological phosphorus removal process to meet the comprehensive sewage discharge standard, and the effluent is difficult to meet the first-level discharge standard. , high operation precision requirements, to achieve the effect of small footprint, stable water output, and reduced load

Inactive Publication Date: 2018-05-08
SHIFANG CHANGFENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biological nitrogen removal process can generally meet the nitrogen discharge standard, but the biological phosphorus removal process is difficult to meet the comprehensive sewage discharge standard of GB 8978-1996
Such as Bardenpho process, A / O system, improved UCT process, SBR process, etc. Although the phosphorus removal rate of these biological phosphorus removal systems has been greatly improved compared with the conventional activated sludge process, the treatment effect is still not stable enough. When the influent TP≥4mg / L, it is difficult for the effluent to meet the first-class discharge standard
Therefore, this treatment method combines physical and chemical treatment and biochemical treatment, but the actual operation process requires high precision and the effluent is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The wastewater used in this example is the wastewater produced by Shifang Changfeng Chemical Co., Ltd., its ammonia nitrogen concentration is 372mg / L, and its P concentration is 602mg / L; the domestic sewage used is Shifang Changfeng Chemical Co., Ltd. domestic wastewater, and its COD concentration 400mg / L, BOD concentration is 150mg / L, NH 4 + The concentration is 30mg / L and the phosphorus content is 3mg / L.

[0025] A treatment method for wastewater containing nitrogen and phosphorus includes the following steps:

[0026] (1) Magnesium ammonium phosphate reaction: Turn on the production wastewater lift pump, and pump the production wastewater into 10m 3 In the stirred reaction tank; n(NH 4 + -N): The molar ratio of n(P) is 1.37:1, add 30% liquid caustic soda by mass to adjust the pH to 9.5, add 100kg of 20% magnesium chloride solution by mass, stir while adding, react for 60min, during the reaction The pH value has decreased, adding liquid caustic soda to stabilize the pH val...

Embodiment 2

[0031] The wastewater used in this example is the wastewater produced by Shifang Changfeng Chemical Co., Ltd., whose ammonia nitrogen concentration is 203 mg / L, and its P concentration is 571 mg / L; the domestic sewage used is Shifang Changfeng Chemical Co., Ltd. domestic wastewater with COD concentration 400mg / L, BOD concentration is 150mg / L, NH 4 + The concentration is 30mg / L and the phosphorus content is 3mg / L.

[0032] A treatment method for wastewater containing nitrogen and phosphorus includes the following steps:

[0033] (1) Magnesium ammonium phosphate reaction: Turn on the production wastewater lift pump, and pump the production wastewater into 10m 3 In the stirred reaction tank; n(NH 4 + -N): the molar ratio of n(P) is 0.75:1.0, add 5.07kg of ammonium sulfate containing 21% nitrogen, adjust (NH 4 + -N): the molar ratio of n(P) to 1.2:1.0, add 30% by mass liquid caustic soda to adjust the pH to 9.5, add 105kg of 20% by mass magnesium chloride solution, stir while adding, re...

Embodiment 3

[0038] The wastewater used in this example is the wastewater produced by Shifang Changfeng Chemical Co., Ltd., which contains NH 4 + The mass concentration of -N is 632mg / L, and the mass concentration of P is 790mg / L; the domestic sewage is Shifang Changfeng Chemical Co., Ltd. domestic wastewater, and the mass concentration of COD is 400mg / L and the mass concentration of BOD is 150mg / L, NH 4 + The mass concentration is 30mg / L and the phosphorus content is 3mg / L.

[0039] A treatment method for wastewater containing nitrogen and phosphorus includes the following steps:

[0040] (1) Magnesium ammonium phosphate reaction: Turn on the production wastewater lift pump, and pump the production wastewater into 10m 3 In the stirred reaction tank; n(NH 4 + -N): The molar ratio of n(P) is 1.77:1.0, 1.5kg of waste phosphoric acid containing 9.5% phosphorus is added, and n(NH 4 + -N) 1.5:1.0n(P) molar ratio, add 30% liquid caustic soda to adjust the pH to 9.5, add 143kg of 20% magnesium chloride...

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Abstract

The invention discloses a treatment method of nitrogen and phosphorus-containing waste water. The three-step treatment including magnesium ammonium phosphate reaction, biochemical treatment and deep treatment is sequentially performed on nitrogen and phosphorus waste water phosphorus containing high-concentration ammonium salt and phosphate; a great number of ammonium salts and phosphate can sequentially react with Mg<2+>; MgNH4PO4.6H2O is recovered to be reused as a slow-release fertilizer; through the biochemical treatment on primary treatment liquid supernatant containing low-content ammonium salt and phosphate, ammonia, nitrogen and partial PO4<3-> ions can be removed; finally, through Ca<2+> ions, a small number of PO4<3-> ions remained after the biochemical treatment can be treated;the outlet water stability can be ensured; the standard reaching discharging is reached.

Description

Technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating nitrogen and phosphorus wastewater containing high-concentration ammonium salts and phosphates. Background technique [0002] Increasing water pollution has posed a major threat to human survival and safety, and has become a major obstacle to human health, economic and social sustainable development. Harm to industrial and agricultural production. After the water quality is polluted, industrial water must invest more in treatment costs, resulting in waste of resources and energy. The main factor of water eutrophication is that the total nitrogen and phosphorus in the water body exceed the standard. If the high-concentration ammonia-containing nitrogen and phosphorus-containing waste industrial wastewater treatment does not meet the standard, it will cause serious environmental pollution, but the existing technology investment and operation cost Very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C05B7/00C02F101/16
CPCC02F1/001C02F1/56C02F1/58C02F1/586C02F1/66C02F3/30C02F9/00C02F2101/105C02F2101/16C02F2209/06C02F2209/08C02F2209/14C02F2301/08C05B7/00
Inventor 杨劲松刘大才杨滨吴雨庭詹强刘泽祥
Owner SHIFANG CHANGFENG CHEM CO LTD
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