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Treating method for phosphoric waste water and sludge generated in production process of phosphatic compound fertilizer

A technology of production process and treatment method, applied in neutralization water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. question

Inactive Publication Date: 2010-12-08
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime has the advantages of wide sources of raw materials and low price, but the processing system is more complicated, and the amount of slag produced is large; the investment of aluminum salt process is relatively low, and the operation is simple, but the price of raw materials is relatively high, and the waste slag generated is difficult to recycle.

Method used

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  • Treating method for phosphoric waste water and sludge generated in production process of phosphatic compound fertilizer
  • Treating method for phosphoric waste water and sludge generated in production process of phosphatic compound fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) After the phosphorus-containing wastewater is measured, it is pumped into the first-stage neutralization reaction tank, and the wastewater is sampled to measure the molar amount of fluorine and phosphorus ions, and then calculate the amount of lime milk input. Add neutralizing agent lime milk, control the pH value in the tank to 5, control the stirring speed of the airflow to 5L / min, make the wastewater appear milky, and fully react for 30 minutes; (2) Add PAM flocculant to the first-level neutralization reaction slurry, The mixed solution is pumped into the I-level high-efficiency coagulation and dense sedimentation machine; (3) The upper clear night overflows into the II-level neutralization reaction tank, and the neutralizer lime milk is put in, and the pH value is controlled to be 10. Fully react for 25 minutes, and the bottom flow contains solid-liquid Go to the sludge concentration tank, and after concentration, go to the belt filter for pressure filtration; (4...

Embodiment 2

[0030] (1) After the phosphorus-containing wastewater is measured, it is pumped into the first-stage neutralization reaction tank, and the wastewater is sampled to measure the molar amount of fluorine and phosphorus ions, and then calculate the amount of lime milk input. Add the neutralizing agent lime milk, control the pH value in the tank to 6, control the stirring speed of the airflow to 5L / min, make the wastewater appear milky, and fully react for 250min; (2) Add PAM flocculant to the first-level neutralization reaction slurry, The mixed solution is pumped into the I-level high-efficiency coagulation and dense sedimentation machine; (3) The upper clear night overflows into the II-level neutralization reaction tank, and the neutralizer lime milk is added in proportion to control the pH value of 11, fully reacted for 20 minutes, and the bottom flow contains Solid-liquid desludge concentration tank, after concentration, go to the belt filter for pressure filtration; (4) Add PA...

Embodiment 3

[0032](1) After the phosphorus-containing wastewater is measured, it is pumped into the first-stage neutralization reaction tank, and the wastewater is sampled to measure the molar amount of fluorine and phosphorus ions, and then calculate the amount of lime milk input. Add neutralizing agent milk of lime earlier, add-on is 70% of total amount, pH value 6 is controlled in the tank, and air flow stirring speed is controlled to be 5L / min, makes waste water be milky, fully reacts 25min; Fully reacts 28min; (2 ) Add PAM flocculant to the first-level neutralization reaction slurry, and the mixed solution is pumped into the first-level high-efficiency coagulation and dense sedimentation machine; (3) the upper clear night overflows into the second-level neutralization reaction tank, and then adds the remaining 30% A large amount of neutralizing agent lime milk, control the pH value of 11, fully react for 22min, the bottom flow contains solid liquid to go to the sludge concentration ta...

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Abstract

The invention discloses a treating method for phosphoric waste water and sludge generated in the production process of a phosphatic compound fertilizer, which comprises the following steps: adding lime milk into the phosphoric waste water to be treated firstly, and controlling a pH value to be 5-6; carrying out neutralization reaction for the first time; adding a PAM flocculating agent for flocculation reaction and then carrying out separation of mud and water; adding the lime milk in the aqueous phase again, and controlling the pH value to be 10-11 for the neutralization reaction for the second time; and adding the PAM flocculating agent again for the flocculation reaction and then carrying out the separation of mud and water, wherein the aqueous phase reaches a effluent standard after filtration. The invention realizes the multiplexing or the standard-reaching discharge of the waste water, the zero release of the sludge, accords to the developing direction of the energy saving and emission reduction and circular economy. The clear liquid treated by the process of the invention contains 0.4-0.5mg / L of phosphate (calculated by being based on P2O5), 8-9mg / L of F and 60-80mg / L of COD, meets the primary standard emission requirement of GB8978-1996, the ultimate clear liquid can be returned to a phosphoric acid device for multiplexing, and also be directly discharged after reaching standards; and the sludge produced by the filtration comprises the following main components: calcium phosphate, calcium fluoride, calcium carbonate and calcium sulfate, which can be totally reused as phosphorite resources.

Description

technical field [0001] The invention belongs to a method for treating phosphorus-containing wastewater and sludge, and in particular relates to a method for specially treating phosphorus-containing wastewater and sludge produced in the production process of phosphorus compound fertilizers. Background technique [0002] There are many phosphorus-containing wastewater treatment processes, which are mainly divided into chemical phosphorus removal method and biological phosphorus removal method. The effect of phosphorus is good, but for the industrial wastewater produced in the production process of phosphorus compound fertilizer, the water lacks the carbon and nitrogen sources necessary for the growth of microorganisms. If this method is used, a large amount of carbon and nitrogen needs to be added, and it is difficult for microorganisms to acclimatize. Therefore, the treatment methods for industrial phosphorus-containing wastewater are mainly selected from chemical methods. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/56
Inventor 盛勇李兵杨联田梅胜明蒋代福胡永华徐仟伍陈明凤张陵冯志平唐均兰州
Owner 中化重庆涪陵化工有限公司
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