Fly ash water purification method

A fly ash and water purification technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as poor coagulation effect, poor settlement performance, and low treatment efficiency, and achieve increased Effects of ion exchange capacity and surface activity, improvement of adsorption capacity, and short settling time

Inactive Publication Date: 2020-07-10
GUODIAN NEW ENERGY TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, PAC and polyacrylamide are less corrosive to equipment and have strong adaptability to temperature and pH, but their sedimentati

Method used

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  • Fly ash water purification method
  • Fly ash water purification method
  • Fly ash water purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Raw material and formula

[0057] Fly ash is taken from Datong No. 2 Power Plant, with an average particle size of 20-30 μm.

[0058] Prepare the materials respectively according to the following formula, the total material of each formula is 100kg: fly ash: sodium hydroxide = 10:1.

[0059] The sewage is taken from the Wenyu River in Changping District, Beijing.

[0060] (2) Method

[0061] Specific steps are as follows:

[0062] 1) Mixing, according to the proportion of the above formula, fully mix the fly ash and sodium hydroxide to obtain the mixed material;

[0063] 2) The mixed material is placed in a rotary furnace, the calcination temperature is 200° C., and the reaction time is 2 hours, so that the mixed material is fully reacted. After cooling, the materials are taken out and ground for later use to obtain low-temperature alkali-modified fly ash.

[0064] 3) Add low-temperature alkali-modified fly ash to the sewage, the dosage is 5g / L, carry out adsor...

Embodiment 2

[0068] (1) Raw material and formula

[0069] Fly ash is taken from Datong No. 2 Power Plant, with an average particle size of 20-30 μm.

[0070] Prepare the materials respectively according to the following formula, the total material of each formula is 100kg: fly ash: solid alkali = 10:1.

[0071] The sewage is taken from the Wenyu River in Changping District, Beijing, and the solid alkali is potassium hydroxide.

[0072] (2) Method

[0073] Specific steps are as follows:

[0074] 1) Mixing, according to the ratio of the above formula, fully mix the fly ash and potassium hydroxide to obtain the mixed material;

[0075] 2) The mixed material is placed in a rotary furnace, the calcination temperature is 200° C., and the reaction time is 3 hours, so that the mixed material is fully reacted. After cooling, the materials are taken out and ground for later use to obtain low-temperature alkali-modified fly ash.

[0076] 3) Add low-temperature alkali fly ash to the sewage, the d...

Embodiment 3

[0079] (1) Raw material and formula

[0080] Fly ash is taken from Datong No. 2 Power Plant, with an average particle size of 20-30 μm.

[0081] Prepare the materials respectively according to the following formula, the total material of each formula is 100kg: fly ash: sodium hydroxide = 10:1.

[0082] Sewage is simulated wastewater containing heavy metals cadmium and nickel.

[0083] (2) Method

[0084] Specific steps are as follows:

[0085] 1) Mixing, according to the proportion of the above formula, fully mix the fly ash and sodium hydroxide to obtain the mixed material;

[0086] 2) The mixed material is placed in a rotary furnace, the calcination temperature is 200° C., and the reaction time is 2 hours, so that the mixed material is fully reacted. After cooling, the materials are taken out and ground for later use to obtain low-temperature alkali-modified fly ash.

[0087] 3) Add low-temperature alkali fly ash to the sewage, the dosage is 5g / L or 20g / L, adsorb at roo...

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Abstract

The invention provides a fly ash water purification method which comprises the following steps: uniformly mixing fly ash with solid alkali in proportion, putting the mixture into a homogeneous reactor, and performing calcining, drying and grinding to obtain low-temperature alkali-modified fly ash; and adding the low-temperature alkali-modified fly ash into sewage, performing mixing and stirring onthe low-temperature alkali-modified fly ash and the sewage, adding a flocculant, quickly stirring, slowly stirring, standing for settling, and finally carrying out sludge separation. The fly ash is comprehensively utilized, environmental pollution can be reduced, the additional value is high, and the dosage of an adsorbent is effectively reduced after alkali modification. The sludge adsorbing ammonia nitrogen, phosphorus and COD can be subjected to alkali activation and cyclic utilization again, so that the resource utilization of the solid waste fly ash is realized. The method is simple in process, low in cost and easy to operate, and can be applied to treatment of heavy metals, ammonia nitrogen, phosphorus and COD in surface water pollution, town sewage and industrial sewage.

Description

technical field [0001] The invention relates to a sewage treatment method in the field of sewage treatment, in particular to a fly ash water purification method. [0002] technical background [0003] At present, the rapid development of my country's economy has caused serious pollution of surface water, which has posed a huge threat to the ecosystem of rivers and lakes. Urban domestic sewage, agricultural sewage and various industrial wastewater and waste liquids contain a large amount of heavy metals, organic matter, ammonia nitrogen, phosphorus, suspended solids, etc., with complex types, wide impacts, and large quantities. A large amount of sewage directly or indirectly enters the water bodies of rivers and lakes. Nitrogen, phosphorus and other nutrients are likely to cause a large number of microorganisms and algae in the water, resulting in serious eutrophication of the water body and a decline in the quality of the water environment. Standard "Class IV water quality i...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/52B01J20/10B01J20/30C02F103/00C02F101/16C02F101/20
CPCB01J20/08B01J20/103C02F1/281C02F1/5236C02F2001/007C02F2101/16C02F2101/20C02F2103/007
Inventor 陈保卫孟瑞红徐冬孙振新杨阳
Owner GUODIAN NEW ENERGY TECH INST
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