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High-efficiency sludge conditioning and dehydrating method

A sludge conditioning and sludge technology, which is applied in biological sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of poor sludge dewatering performance, high cost, Poor stability and other problems, to achieve the effect of improving dehydration effect, stable material properties, and mild reaction conditions

Inactive Publication Date: 2019-11-19
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent is based on free radical chemical activation combined with thermal activation to synergistically condition the sludge, which can realize the recycling of the activator, but this method uses zero-valent iron as the conditioner. Due to the high surface energy of zero-valent iron, its stability in the air Very poor, and this method needs to add a large amount of zero-valent iron, accounting for 25-27% of the dry weight of the sludge, the cost is high, and the dehydration performance of the conditioned sludge is not very good

Method used

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  • High-efficiency sludge conditioning and dehydrating method

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Experimental program
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Effect test

Embodiment 1

[0031] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.0g / L, the water content was 97.328%, and the temperature and pH were 25°C and 6.5, respectively.

[0032] 1) Take 300mL of activated sludge and place it in a beaker;

[0033] 2) Treat the sludge with ultrasonic waves with a frequency of 1k-5kHz for 5 minutes;

[0034] 3) Add 0.02g / g TSS Thiobacillus and 0.05g / gTSS siderite and 0.10g / gTSS potassium hydrogen persulfate to the sludge, turn on the mechanical stirrer, stir the sludge, the stirring intensity is 100r / min, then keep stirring for 30min;

[0035] 4) Gravity sedimentation is carried out to the conditioned sludge, and then the filtrate is discharged;

[0036] 5) Turn o...

Embodiment 2

[0039] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.0g / L, the water content was 97.330%, and the temperature and pH were 25°C and 6.5, respectively.

[0040] 1) Take 300mL of activated sludge and place it in a beaker;

[0041] 2) Treat the sludge with ultrasonic waves with a frequency of 8k-10kHz for 25min;

[0042] 3) Add 0.04g / g TSS Thiobacillus and 0.10g / gTSS siderite and 0.20g / gTSS potassium hydrogen persulfate to the sludge, turn on the mechanical stirrer, stir the sludge, the stirring intensity is 100r / min, then keep stirring for 10min;

[0043] 4) Gravity sedimentation is carried out to the conditioned sludge, and then the filtrate is discharged;

[0044] 5) Turn on t...

Embodiment 3

[0047] The sludge to be dewatered is collected from a sewage treatment plant in a certain city, which uses the traditional activated sludge process to treat municipal sewage. The activated sludge collection point is located somewhere on the return path from the secondary sedimentation tank to the aeration tank. The sludge concentration (MLSS) reached 20.0g / L, the water content was 97.322%, and the temperature and pH were 25°C and 6.5, respectively.

[0048] 1) Take 300mL of activated sludge and place it in a beaker;

[0049] 2) Treat the sludge with ultrasonic waves with a frequency of 1k-5kHz for 5 minutes;

[0050] 3) Add 0.02g / g TSS Thiobacillus, 0.10g / gTSS siderite and 0.20g / gTSS potassium hydrogen persulfate to the sludge, turn on the mechanical stirrer, stir the sludge, the stirring intensity is 100r / min, then keep stirring for 30min;

[0051] 4) Gravity sedimentation is carried out to the conditioned sludge, and then the filtrate is discharged;

[0052] 5) Turn on t...

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Abstract

The invention discloses a sludge conditioning-horizontal electric field dehydration method. The method comprises the following main steps: (1) carrying out ultrasonic treatment on sludge; (2) adjusting the temperature and pH value of the sludge; (3) adding thiobacillus, siderite and persulfate into the sludge, carrying out uniform mixing, and then performing a reaction for a certain period of time; and (4) introducing a mixture obtained in the previous step into a horizontal electric field for dehydration. According to the invention, ultrasonic damage of microbial cells and promotion of an oxidation reaction of siderite with persulfate via thiobacillus are combined together, so the generation of sulfate radical free radicals is activated, a Fe (II) redox cycle is formed, and a sludge structure is disintegrated; the horizontal electric field is cooperatively used for dehydration; and thus, respective advantages are give to full play, synergistic effect is generated, and the moisture content of the conditioned sludge is reduced to 50-70%. The conditioning method is clear in steps and easy to operate, avoids generation of excessive <Fe> due to feeding of excessive siderite, saves cost, and has obvious dehydration effect and no secondary pollution.

Description

technical field [0001] An efficient sludge conditioning and dehydration method belongs to the technical field of environmental protection. Background technique [0002] In my country, due to the rapid development of society, economy and urbanization, municipal wastewater treatment plants (WWTPs) produce a large amount of sludge, and the sludge production is expected to exceed 60 million tons / year by 2020. The remaining sludge contains a large number of pathogenic bacteria, heavy metals and organic pesticides, which will bring harm to environmental quality and human health. The treatment and disposal of sludge has become a serious environmental problem. The "Water Pollution Prevention and Control Action Plan" promulgated by my country in 2015 specifically pointed out the need to promote sludge treatment and disposal. The sludge generated by sewage treatment facilities should be reduced, stabilized, harmless and recycled. How to effectively reduce Sludge moisture content is a...

Claims

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Application Information

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IPC IPC(8): C02F11/15C02F11/02
CPCC02F11/02C02F2303/06C02F11/15
Inventor 王毅力李恩锐
Owner BEIJING FORESTRY UNIVERSITY
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