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Sludge dewatering conditioning agent and dewatering method thereof

A sludge dehydration and conditioner technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of poor economy, complicated preparation process, large specific surface area, etc., achieve improved stability and reliability, and simple conditioning process , the effect of a wide range of raw material sources

Active Publication Date: 2016-02-10
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology

The high-efficiency composite dehydration conditioner developed by CN1621371A has high organic polymer content and high cost, and it is difficult to reuse the subsequent sludge cake; CN1986788A uses iron salt, calcium salt or calcium oxide as the chemical conditioner, and adopts a step-by-step dosage method. Complicated, the water content of the sludge after dehydration is still above 59%, and the effect is general; CN101182095A discloses a high-efficiency composite filter aid for sludge dehydration, which has up to 9 components, and the preparation process is complicated, so it is difficult to apply on a large scale; CN101289268A discloses a The method of dehydrating activated sludge by using waste alkali slag / alkali solution has high stability of dewatered sludge, and can also realize the reuse of waste alkali slag, but its main disadvantage is that the volume of sludge is large, and the follow-up of sludge Resource utilization is more difficult; CN101397181A uses fly ash and quicklime as the inorganic composite conditioner, because of the large amount of fly ash added, there is also the problem of large sludge cake expansion, and the source of high-quality fly ash is also Subject to certain restrictions; the used ion dispersants of the sludge dewatering agent disclosed in CN101100345A are as high as 5 kinds, and the filtrate will cause secondary pollution; the mud cake produced by the conditioning method of CN101693593A has a higher organic matter content than that of iron salt and calcium oxide as dehydrating agent. The organic matter content of the cake is about 10%, which is not conducive to subsequent disposal methods such as landfill
[0006] A comprehensive analysis of the published patents found that various sludge dehydration conditioners have the following disadvantages and deficiencies in the preparation and application: (1) The amount of conditioner added is large, and the sludge cake after sludge dehydration increases greatly, which is not conducive to subsequent (2) The sludge conditioning process is relatively complicated and not suitable for large-scale sludge conditioning and dehydration applications; (3) The sludge conditioning process has high investment and operating costs and poor economic efficiency
[0009] Analyzing the properties of desulfurization ash, it has the properties of high alkalinity, fine particles, large specific surface area, strong adsorption capacity, and high content of calcium-based elements, and has the basic conditions to be used as a sludge dehydration conditioner. There is no report on extending desulfurization ash to be used as sludge dehydration conditioner

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  • Sludge dewatering conditioning agent and dewatering method thereof

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Experimental program
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Effect test

Embodiment 1

[0050] The sludge is the remaining sludge from the secondary settling tank of the cold rolling wastewater treatment station of a stainless steel enterprise, with a moisture content of 98%; the desulfurization ash is a by-product of the sintering flue gas purification device obtained from a circulating fluidized bed process in a steel factory, of which CaSO 3 1 / 2H 2 O, CaCO 3 , f-CaO and Ca(OH) 2 The total mass fraction of the four substances is 85%.

[0051] Magnesium chloride, ferric sulfate, aluminum sulfate, and magnesium oxide are commercially available products with industrial grade purity.

[0052] Such as figure 1 As shown, mix desulfurization ash, magnesium chloride, iron sulfate, aluminum sulfate, and magnesium oxide according to the weight percentage of 50%, 10%, 30%, 5%, and 5%, and add water to make a solution; according to the dry weight of sludge 3 %, add it into the conditioning tank, stir evenly, and after conditioning for 60 minutes, pump it into the slud...

Embodiment 2

[0058] The sludge is the remaining sludge from the secondary settling tank of an urban domestic sewage plant, with a moisture content of 97.5%; the desulfurization ash is the by-product of the sintering flue gas purification device obtained by the rotary spraying process of a steel factory, in which CaSO 3 1 / 2H 2 O, CaCO 3 , f-CaO and Ca(OH) 2 The total mass fraction of the four substances is 95%.

[0059] Magnesium phosphate, ferric chloride, polyaluminum ferric sulfate, and magnesium oxide are commercially available products with industrial grade purity.

[0060] Such as figure 1 As shown, mix desulfurization ash, magnesium chloride, iron sulfate, aluminum sulfate, and magnesium oxide according to the weight percentage of 70%, 10%, 10%, and 10%, and add water to make a solution; according to the proportion of 30% of the dry weight of sludge , into the conditioning tank, stir evenly, after conditioning for 20 minutes, pump into the sludge thickening tank.

[0061] Dissol...

Embodiment 3

[0064] The sludge is the remaining sludge from the secondary settling tank of a waterworks, with a moisture content of 99%; the desulfurization ash is the by-product of the purification and sintering flue gas purification device of a steel factory furnace with calcium oxide activation process, in which CaSO 3 1 / 2H 2 O, CaCO 3 , f-CaO and Ca(OH) 2 The total mass fraction of the four substances is 50%.

[0065] Magnesium sulfate, ferric sulfate, polyaluminum ferric sulfate, and magnesium oxide are commercially available products with industrial grade purity.

[0066] Such as figure 1 As shown, mix desulfurization ash, magnesium chloride, ferric sulfate, polyaluminum chloride, and magnesium oxide according to the weight percentage of 30%, 15%, 30%, 10%, and 15%, and add water to make a solution; Add 20% weight to the conditioning tank, stir evenly, and pump it into the sludge thickening tank after conditioning for 50 minutes.

[0067] Dissolve the anionic polyacrylamide with...

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Abstract

The present invention discloses a sludge dewatering conditioning agent, which comprises, by weight, 30-70% of desulfurization ash, 5-15% of a magnesium salt, 5-30% of an iron salt, 2-20% of an aluminum salt, and 0.1-15% of magnesium oxide. The invention further provides a dewatering method of the conditioning agent, wherein the dewatering method comprises conditioning agent solution preparing, sludge conditioning, flocculant solution preparing, sludge dewatering and other steps. According to the present invention, the characteristics of wide used raw material source, and low raw material price, low preparation cost and good dewatering effect are provided, the method can be performed through the existing sludge dewatering facility, the implementation process is simple, the stability and the reliability of the sludge dewatering process can be effectively improved, and the sludge dewatering conditioning agent and the dewatering method can be widely used for treatments of various wastewater, sewage and sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a composite sludge dewatering conditioner, and also relates to the application of the conditioner and a method for sludge dewatering. Background technique [0002] Sludge dehydration is one of the most expensive and extremely critical processes in sewage treatment, which directly affects the moisture content of sludge, sludge production and the cost of subsequent transportation, sanitary landfill, composting for agriculture or incineration. The moisture in sludge exists in the form of interstitial water or free water (about 65-85% of sludge moisture), capillary water (about 15-20% of sludge moisture), adsorbed water (<10%), Combined water (<10%) and other four. [0003] Usually, the moisture content of the sludge from the secondary settling tank is above 98%. In order to improve the sludge dewatering performance and the mechanical dehydration effect, i...

Claims

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Application Information

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IPC IPC(8): C02F11/14
Inventor 石磊潘世华周庆安刘金成顾德仁张文志
Owner BAOSHAN IRON & STEEL CO LTD
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