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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Sludge dewatering conditioning agent and dewatering method thereof

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Example Embodiment

[0049] Example 1

[0050] The sludge is the remaining sludge from the secondary sedimentation tank of a cold-rolling wastewater treatment station of a stainless steel company, with a moisture content of 98%; the desulfurization ash is a by-product of the sintering flue gas purification device from a circulating fluidized bed process in a steel plant. 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, iron sulfate, aluminum sulfate, and magnesium oxide are commercially available products with industrial grade purity.

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

Example Embodiment

[0057] Example 2

[0058] The sludge is the surplus sludge taken from the secondary settling tank of a municipal sewage plant, with a moisture content of 97.5%; the desulfurization ash is taken from the by-product of the sintering flue gas purification device of a steel plant's rotary spray process, 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 95%.

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

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

[0061] The cationic polyacrylamide wi...

Example Embodiment

[0063] Example 3

[0064] The sludge is the surplus sludge taken from the secondary settling tank of a water plant, with a moisture content of 99%; the desulfurization ash is taken from the by-product of the sintering flue gas purification device of a steel plant’s 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, iron sulfate, polyaluminum iron sulfate, and magnesium oxide are commercially available products with industrial grade purity.

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

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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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