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New application of carbide slag in sewage treatment

A technology for sewage treatment and calcium carbide slag, which is applied in the fields of water/sludge/sewage treatment, sludge treatment, processing wastewater treatment, etc. It can solve the problems of high sludge water content and high sludge treatment cost.

Inactive Publication Date: 2016-06-08
CHONGQING PENGYUE SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the process of sewage treatment, flocculants (such as polyaluminum chloride, polyaluminum ferric chloride, polyacrylamide cation and other chemicals) should be added to the sludge before press filtration of biochemical sludge to concentrate, and then press filter, pass through the plate The frame-type filter press filters the sludge with a water content between 50% and 60%, and then sends the sludge to the boiler for incineration treatment. high

Method used

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  • New application of carbide slag in sewage treatment
  • New application of carbide slag in sewage treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Carbide slag is used for the sedimentation of biochemical sludge in pulp and papermaking sewage, according to the following steps:

[0014] Carbide slag (about 85% of calcium hydroxide in terms of mass percentage, about 3% of silicon oxide, about 1% of aluminum oxide, 2% of calcium carbonate, 2.6% of ferric oxide, 1.4% of magnesium oxide, titanium dioxide 1%, carbon slag 0.5%, calcium sulfide 0.5%, water 3%, taking the total mass of calcium carbide slag as 100%) to be added to the concentrated biochemical sludge in papermaking sewage treatment for sedimentation, and the dry matter of calcium carbide slag The mass ratio of biochemical sludge to papermaking sewage is 0.3:1. After separating the water, it enters the plate and frame sludge dewatering filter press for pressure filtration. The water content of the sludge obtained after pressure filtration is about 40%. The final sludge is sent to the boiler for incineration treatment, and part of the sulfur dioxide in the boi...

Embodiment 2

[0016] Carbide slag is used for the settlement of biochemical sludge in domestic sewage. At present, the treatment of biochemical sludge in domestic sewage treatment plants is to add flocculant for sedimentation and then send it to vacuum filter press for suction filtration. The water content of the filter residue is generally 80%-90%. If instead of adding calcium carbide slag to the sludge, using a plate and frame filter press, the water content can reach about 40%, and the implementation is carried out according to the following steps:

[0017] Calcium carbide slag (about 80% of calcium hydroxide in terms of mass percentage, about 5% of silicon oxide, about 3% of aluminum oxide, 1% of calcium carbonate, 0.6% of ferric oxide, 1% of magnesium oxide, titanium dioxide 1%, carbon slag 2.5%, calcium sulfide 0.4%, water 5%, based on the total mass of calcium carbide slag as 100%) added to the sand settling, primary settling and biochemical sludge discharged from the biological turnt...

Embodiment 3

[0019] Carbide slag is used for the sedimentation of biochemical sludge in pulp and papermaking sewage, according to the following steps:

[0020] Calcium carbide slag (calcium hydroxide 90% in terms of mass percentage, about 2% of silicon oxide, about 0.1% of aluminum oxide, and 0.7% of calcium carbonate, 0.6% of ferric oxide, 0.4% of magnesium oxide, 0.3% of titanium dioxide %, carbon slag 0.9%, calcium sulfide 0.5%, water 4.5%, taking the total mass of calcium carbide slag as 100% meter) in the concentrated biochemical sludge in the papermaking sewage treatment to carry out settlement, described calcium carbide slag dry matter and The mass ratio of biochemical sludge to dry matter of papermaking sewage is 0.25:1. After separating the water, it enters the plate and frame sludge dewatering filter press for pressure filtration. The water content of the sludge obtained after pressure filtration is about 40%. The sludge is dried and coal incinerated, and the amount of sulfur dio...

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Abstract

The invention relates to new application of carbide slag in settling biochemical sludge of sewage treatment. When the carbide slag is used for settling biochemical sludge in sewage treatment, no flocculant is additionally needed, and sludge which is separated from water and pressure filtration is subjected to pressure filtration by a plate and frame filter press, so that the water content of sludge can be lowered to 40% or so, and thereby lowering the sludge drying treatment cost. The cheap carbide slag is effectively utilized instead of the conventional flocculant, thereby obviously lowering the sludge treatment cost and enhancing the sludge treatment efficiency. Besides, the biochemical sludge settled by the carbide slag is treated by the plate and frame filter press and sent to the boiler for incineration treatment, so that the sulfur dioxide discharge of the boiler can be effectively lowered, thereby saving the desulfurizer consumption and obviously saving the sludge incineration treatment cost. After the carbide slag is added, the sludge becomes alkaline, and has the sterilization and deodorization effects.

Description

technical field [0001] The invention relates to a new application of calcium carbide slag, in particular to a new application of calcium carbide slag in sewage treatment. Background technique [0002] In the process of sewage treatment, flocculants (such as polyaluminum chloride, polyaluminum ferric chloride, polyacrylamide cation and other chemicals) should be added to the sludge before pressure filtration of biochemical sludge to concentrate, and then press filtration, through the plate The frame-type filter press filters out the sludge with a water content between 50% and 60%, and then sends the sludge to the boiler for incineration treatment. After the filter press, the sludge has a high water content, which leads to the cost of subsequent treatment of the sludge. Not high enough. [0003] Carbide slag is a by-product produced when calcium carbide is used to make acetylene. The reaction between calcium carbide and water produces acetylene gas. The reaction equation is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F103/28
CPCC02F11/12C02F11/122C02F2103/28
Inventor 曾黎肖勇邹哲平
Owner CHONGQING PENGYUE SCI & TECH DEV
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