Method for dehydrating viscous waste by vacuum coupled physicochemical strengthening and device

A physicochemical, viscous technology, applied in chemical instruments and methods, dewatering/drying/concentrating sludge treatment, water pollutants, etc., can solve the problems of viscous waste with high viscosity, high moisture content and difficult dehydration.

Inactive Publication Date: 2019-04-26
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0008] In view of the limitations of the existing technology in the treatment of heavy metals and water content in viscous waste, that is, the existing low efficiency of removing heavy metals, the existence of secondary pollution and the high viscosity of viscous waste makes it difficult to dehydrate, blockage of devices and high water content of dehydrated viscous waste problem, the present invention provides a method of vacuum coupling physical and chemical enhanced dehydration of viscous waste, that is, the viscous waste is first made into a slurry with high water content, and the slurry is kept at a certain temperature; then phosphoric acid is formed by adding auxiliary materials, and phosphoric acid causes the combination Water and heavy metals are separated from viscous waste particles; phosphoric acid reacts with heavy metals to generate soluble metal salts; the treated viscous waste is dehydrated through an improved dehydration device, and finally harmless and low moisture content viscous waste is obtained. Water is treated with ion exchange resin to recover phosphoric acid; thereby optimizing the entire treatment process of viscous waste and efficiently realizing its harmless and resourceful utilization; specifically, the following steps are included:

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  • Method for dehydrating viscous waste by vacuum coupled physicochemical strengthening and device
  • Method for dehydrating viscous waste by vacuum coupled physicochemical strengthening and device
  • Method for dehydrating viscous waste by vacuum coupled physicochemical strengthening and device

Examples

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Embodiment 1

[0048] Embodiment 1: The processing object of this embodiment is the cow feces produced by a dairy cow breeding factory, its moisture content is 85%, and its density is 1t / m 3 ,Specifically:

[0049] Make 3 tons of fresh cow dung into a slurry with a moisture content of 95%, and the temperature of the slurry is 40°C, and add auxiliary material P to the slurry 2 o 5 , stirring reaction 4h, P 2 o 5 The amount of addition is 40% of the mass of viscous waste (1.2 tons), and the P 2 o 5 Mix well with viscous waste, P 2 o 5 The heated interstitial water reacts to generate phosphoric acid. Phosphoric acid is corrosive to sticky waste particles, causing the bound water on the surface of molecules or inside the sticky waste to detach, and at the same time, the heavy metals in the particles are detached, realizing the combination of bound water, interstitial water and heavy metals. For the separation of waste particles, heavy metals exist in the slurry in a combined state; becaus...

Embodiment 2

[0053] Embodiment 2: the processing object of this embodiment: the chicken excrement that certain chicken breeding factory produces, and its moisture content is 75%, and density is 1.25t / m 3 ,Methods as below:

[0054] (1) Make viscous waste into a slurry with a water content of 95%, and the temperature of the slurry is 30°C, and add auxiliary material P to the slurry 2 o 5 ,P 2 o 5 The amount of addition is 25% of the mass of the viscous waste, and the reaction is stirred for 3 hours to realize the separation of bound water, interstitial water, and heavy metals from the viscous waste particles. The heavy metals exist in the slurry in a combined state; Add conditioner in remaining waste, the add-on of iron salt conditioner ferric chloride is 0.5% of the viscous waste quality, the add-on of aluminum salt conditioner alum is 0.05% of viscous waste quality; 2% of the mass of viscous waste; the amount of diatomaceous earth added is 0.1% of the mass of viscous waste. After stir...

Embodiment 3

[0058] Embodiment 3: The processing object of this embodiment: the dewatered sludge produced by a certain urban sewage treatment plant, its moisture content is 90%, and its density is 1.07t / m 3 ,Methods as below:

[0059] (1) Make viscous waste into a slurry with a water content of 92%, and the temperature of the slurry is 50°C, and add auxiliary material P to the slurry 2 o 5 ,P 2 o 5 The amount added is 10% of the mass of the viscous waste, and the reaction is stirred for 2 hours to realize the separation of bound water, interstitial water, and heavy metals from the viscous waste particles. The heavy metals exist in the slurry in a combined state; Add conditioner in remaining waste, the add-on of iron salt conditioner ferrous sulfate hydrate is 1% of viscous waste quality, the add-on of aluminum salt conditioner aluminum chloride is 1% of viscous waste quality; The amount of added is 0.05% of the mass of viscous waste; the amount of fly ash added is 1% of the mass of vis...

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Abstract

The invention discloses a method for dehydrating viscous waste by vacuum coupled physicochemical strengthening. The method comprises steps as follows: the viscous waste is prepared to form slurry withhigh water content firstly and is kept at certain temperature; phosphoric acid is formed by the aid of added auxiliary materials, and bound water and heavy metals are separated from viscous waste particles by the aid of phosphoric acid; phosphoric acid and the heavy metals are subjected to a reaction, and soluble metal salts are generated; the treated viscous waste is dehydrated by an improved dehydration device, finally, the harmless viscous waste with low water content is obtained, water obtained by dehydration is treated by ion exchange resin, and phosphoric acid is recovered. The problemsof low dehydration efficiency and high heavy metal content of a traditional viscous waste treatment mode are solved; the treated viscous waste can realize harmless discharge and recycling.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method and a device for vacuum coupling physical and chemical enhanced dehydration of viscous waste. Background technique [0002] In the wave of rapid economic development, people have gradually realized the importance of the ecological environment, and there has been a concept of "golden mountains and silver mountains are like green water and green mountains", and the governance of the ecological environment is urgent. China is a big country in industry and agriculture. At present, the processing and manufacturing industry based on processing raw materials and the small-scale farming economy of livestock breeding and animal husbandry still dominate; a large amount of sticky solid waste will be generated in the simple production and processing process, such as industrial waste. mud, waste residue, and livestock excrement, etc., which have the characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/125C02F11/122C02F101/20C02F103/20
CPCC02F11/122C02F11/125C02F11/14C02F2101/20C02F2103/20
Inventor 瞿广飞李江松蔡营营任南琪宁平
Owner KUNMING UNIV OF SCI & TECH
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