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A sewage treatment plant sludge reduction and recycling process

A technology of sewage treatment plant and treatment process, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc., which can solve the problems affecting the promotion and application of sludge anaerobic digestion technology and the conversion rate of organic matter And problems such as low biogas yield and long sludge residence time, to achieve good sludge drying effect, realize sludge reduction, and save aeration energy consumption

Active Publication Date: 2017-02-01
CHINA NAT ELECTRIC APP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the sludge anaerobic digestion treatment has problems such as low conversion rate of organic matter and low biogas yield, or long sludge residence time, which leads to large-scale treatment equipment and high investment. For the actual situation of low sludge organic matter content in my country Said, these problems are more prominent
This largely affects the promotion and application of sludge anaerobic digestion technology in my country.

Method used

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  • A sewage treatment plant sludge reduction and recycling process
  • A sewage treatment plant sludge reduction and recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 2 Shown in, the waste water treatment plant sludge reduction and recycling treatment process provided by the present invention comprises the following steps:

[0038] (1) After the sewage entering the sewage treatment plant is pretreated by coarse screens, fine screens and aeration grit chambers, it enters a rectangular high-efficiency pressurized dissolved air flotation device, and PAM flocculant (dosing amount 1mg / L), most of the suspended particles (SS) and some dissolved organic matter in the sewage are removed to form "primary sludge"; the test results show that in this process, 50%~70% of the suspended particles (SS) is removed, and the sewage treated by the high-efficiency dissolved air flotation device is respectively passed through the biochemical treatment unit (aerobic, A 2 O method), the secondary settling tank and disinfection treatment are discharged up to the standard. Since the air flotation unit removes 50%~70% of suspended particles (S...

Embodiment 2

[0042] Such as figure 2 Shown in, the waste water treatment plant sludge reduction and recycling treatment process provided by the present invention comprises the following steps:

[0043] (1) After the sewage entering the sewage treatment plant is pretreated by coarse screens, fine screens and aeration grit chambers, it enters the shallow high-efficiency dissolved air flotation device, and PAM flocculant (dosing amount 2mg / In the case of L), most of the suspended solids (SS) and part of the dissolved organic matter in the sewage are removed to form "primary sludge"; the test results show that during this process, 50% to 70% of the suspended solids (SS ) is removed, and the sewage treated by the high-efficiency dissolved air flotation device is discharged to the standard after the biochemical treatment unit (aerobic, CASS method), secondary sedimentation tank and disinfection treatment, because the air flotation unit removes 50%~70% of the sewage % of suspended particles (S...

Embodiment 3

[0047] The difference from Example 1 is that the biogas generated by the anaerobic digestion of the mixed sludge in step (2) is directly passed into the biogas boiler after dehydration, desulfurization and purification treatment to generate a heat source for sludge drying. Finally, the dried sludge obtained is transported to the landfill for landfill disposal.

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Abstract

A technology for reducing and recycling treatment of sludge of a sewage treatment plant comprises steps as follows: sewage is treated with an air-floatation method, pretreated sewage and primary sludge are produced, the pretreated sewage is drained after biochemical treatment, treatment by a secondary sedimentation tank and disinfection treatment, excess sludge is separated in the secondary sedimentation tank, the primary sludge and the excess sludge are concentrated, and concentrated sludge and a supernate are separated out; the concentrated sludge has an anaerobic digestion reaction, digested sludge is subjected to incineration or landfill treatment after dehydration and drying treatment, a filtrate is produced during dehydration of the digested sludge, and biogas is subjected to power generation and / or heat recovery treatment after dehydration and desulfurization treatment; the supernate and the filtrate are mixed for nitrogen and phosphorus removal. With the adoption of the technology, the primary sedimentation effect of the sewage is improved, the yield of the primary sludge is increased, the primary sludge is removed before biochemical treatment, the yield of the excess sludge is decreased from the source, the primary sludge and the excess sludge are subjected to anaerobic digestion treatment, the higher organic matter transformation rate and the higher biogas yield can be obtained, and the sludge can be reduced and recycled.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment technology, and in particular relates to a sewage treatment plant sludge reduction and resource recovery treatment process. Background technique [0002] The residual sludge of the sewage treatment plant is a by-product of the sewage treatment process, and about 50% of the pollutants in the sewage are transferred to the sludge. If the sludge from the sewage treatment plant is not properly treated and disposed of in a timely manner, it is directly transported outside, directly used for agriculture, or randomly piled up and non-standard landfilled. Pollutants may enter the soil, surface water body and groundwater system to cause secondary pollution, resulting in serious Affect the actual effectiveness of water pollution control. Therefore, the sludge must be properly treated and disposed to achieve harmlessness, stabilization and reduction. [0003] At present, the harmless, stabilized, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/00
Inventor 周艳伟谢乔光易莹孔伟张堃
Owner CHINA NAT ELECTRIC APP RES INST
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