Method for municipal sludge in-situ detwatering by utilization of Fenton sludge

A municipal sludge and in-situ dehydration technology, applied in water/sludge/sewage treatment, sludge detoxification, sludge treatment, etc., can solve the problems of sludge dehydration difficulty, achieve good stability and low treatment cost , to avoid the effect of odor and leakage

Active Publication Date: 2016-03-23
NANJING SHENKELONG ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fenton oxidation treatment of sewage and coagulation treatment of wastewater The bottom sludge of sedimentation tanks generally contains more iron hydroxide precipitates, and the presence of iron hydroxide often brings difficulties to sludge dehydration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The Fenton sludge is the chemical sludge produced by the advanced treatment of the Fenton oxidation method in the sewage treatment plant, and the concentration of heavy metals contained in it is lower than the requirements in GB4284-84. Fe in the dried mud was measured after the Fenton sludge that this embodiment adopted was dried. 2 o 3 The content is 52.7%.

[0035] Specific steps:

[0036] (1) After the sludge containing a large amount of iron elements produced by the Fenton oxidation advanced treatment of industrial wastewater is filtered by the sewage treatment plant, then after natural air drying or mechanical dehydration, sulfuric acid is added to activate it, so that the iron elements in it exist in the form of ions in sludge;

[0037] (2) Put plastic drainage boards into the municipal sludge field piled up in large quantities to carry out dehydration pretreatment of municipal sludge, and discharge the water generated in the following steps by conventional va...

Embodiment 2

[0050] Fe in the dried mud was measured after the Fenton sludge that this embodiment adopted was dried. 2 o 3 The content is 49.7%.

[0051] Specific steps:

[0052] (1) After the sludge containing a large amount of iron elements produced by the Fenton oxidation advanced treatment of industrial wastewater is filtered by the sewage treatment plant, then after natural air drying or mechanical dehydration, sulfuric acid is added to activate it, so that the iron elements in it exist in the form of ions in sludge;

[0053] (2) Put plastic drainage boards into the municipal sludge field piled up in large quantities to carry out dehydration pretreatment of municipal sludge, and discharge the water generated in the following steps by conventional vacuum preloading drainage method, so as to reduce the amount of municipal sludge in advance stabilization and stabilization;

[0054] (3) Add the Fenton sludge activated with sulfuric acid into the pretreated municipal sludge, and stir t...

Embodiment 3

[0066] Fe in the dried mud was measured after the Fenton sludge that this embodiment adopted was dried. 2 o 3 The content is 45.2%.

[0067] Specific steps:

[0068] (1) After the sludge containing a large amount of iron elements produced by the Fenton oxidation advanced treatment of industrial wastewater is filtered by the sewage treatment plant, then after natural air drying or mechanical dehydration, sulfuric acid is added to activate it, so that the iron elements in it exist in the form of ions in sludge;

[0069] (2) Put plastic drainage boards into the municipal sludge field piled up in large quantities to carry out dehydration pretreatment of municipal sludge, and discharge the water generated in the following steps by conventional vacuum preloading drainage method, so as to reduce the amount of municipal sludge in advance stabilization and stabilization;

[0070] (3) Add the Fenton sludge activated with sulfuric acid into the pretreated municipal sludge, and stir t...

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Abstract

The invention relates to a method for municipal sludge in-situ detwatering by utilization of Fenton sludge. Sludge is subjected to press filtration and dewatering in a sewage treatment plant, then sulfuric acid is added, activation is carried out, thus iron elements with an ionic state exist in the sludge, plastic drain boards are put into municipal sludge, dewatering pre-treatment is carried out, water is drained through a conventional vacuum precompressed drainage method, the Fenton sludge after activation of sulfuric acid is added in the municipal sludge after pre-treatment, the mixture is stirred uniformly, quicklime is added, stirring is carried out, thus the sludge and calcium oxide are mixed uniformly and rapidly, pH adjustment, deodorizing and disinfection are carried out, and the purposes of deep dewatering and stabilization are achieved. The provided method overcomes the detect of high operation and disposal costs of previous sludge processing. The sludge containing a lot of iron elements as a product of the Fenton oxidation method is employed as a coagulant for municipal sludge solidified treatment, the sludge after activation contains a lot of Fe<3+> irons, the ferric salt with a high valence can be employed as a leaching agent, heavy metal ions in the sludge can be leached, and the sludge is discharged.

Description

technical field [0001] The invention belongs to the technical field of resource and environment protection, and in particular relates to a method for in-situ dehydration of municipal sludge by using Fenton sludge. Background technique [0002] At present, a total of 3,622 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of 153 million m 3 / d. As of 2015, the annual production of wet sludge (with a moisture content of 80%) in urban sewage treatment plants across the country will reach 33.59 million tons. Due to the phenomenon of "heavy water and light mud" in the planning and design of many sewage treatment plants in my country, the investment in sludge treatment and disposal is far behind the investment in sewage treatment, and thousands of tons of sludge are often not available Proper handling has led to endless cases of illegal sludge discharge all over the country. [0003] The status quo of sludge disposal in urban sewage treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/00
CPCC02F11/00C02F11/004C02F11/14C02F2303/02C02F2303/04C02F2303/06
Inventor 田宝凤周倜江双双
Owner NANJING SHENKELONG ENVIRONMENTAL PROTECTION
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