Residual sludge reduction system and method for wastewater biochemical treatment system

A biochemical treatment and sludge reduction technology, which is applied in water/sewage treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problems of increased water salinity, increased difficulty of sludge digestion, and high operating costs, achieving Promote sludge reduction, effect improvement, and good economical effect

Inactive Publication Date: 2019-11-22
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent uses chlorine dioxide oxidant. Although chlorine dioxide itself is non-toxic and harmless, the oxidation product contains chloride ions, which introduces new pollutants and increases the salinity of the water body, making subsequent sludge digestion more difficult, and also Ultrasonic generating device is used, and the operating cost is high

Method used

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  • Residual sludge reduction system and method for wastewater biochemical treatment system
  • Residual sludge reduction system and method for wastewater biochemical treatment system
  • Residual sludge reduction system and method for wastewater biochemical treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A wastewater biochemical treatment system excess sludge reduction system, including a secondary settling tank 2 connected to the sludge outlet of a biochemical treatment unit 1, a pretreatment tank 3 connected to the secondary settling tank 2 in sequence, a hydraulic cavitation device 4, and a pH adjustment pool 5, the outlet of the pH adjustment pool 5 is connected to the biochemical treatment unit 1 to form a loop, and the outlet of the hydraulic cavitation device 4 leads another branch path back to the pretreatment pool 3, and the pretreatment pool 3 is provided with additional pretreatment Reagent inlet.

[0028] The specific method is as follows:

[0029] The waste water is treated intermittently. After being treated by the biochemical treatment unit 1, it enters the secondary settling tank 2. The waste water settled in the secondary settling tank 2 is discharged, and the valve 6 is opened to transport the remaining sludge in the secondary settling tank 2 to the pr...

Embodiment 2

[0034] As in the operation steps of Example 1, run the system according to the conditions in Table 2, take the sludge in the secondary settling tank and measure the MLSS, SCODcr, s-protein (soluble protein), s-sugar (soluble sugar) before the reduction , after the hydraulic cavitation device, the above-mentioned data of the sludge sample after the reduction were measured, and the results are shown in Table 2:

[0035] Table 2

[0036]

Embodiment 3

[0038] As in the operation steps of Example 1, run the system according to the conditions in Table 3, take the sludge in the secondary settling tank and measure the MLSS, SCODcr, s-protein (soluble protein), s-sugar (soluble sugar) before the reduction , after the hydraulic cavitation device, the above-mentioned data of the sludge sample after the reduction were measured, and the results are shown in Table 3:

[0039] table 3

[0040]

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Abstract

The invention relates to a residual sludge reduction system and method for a wastewater biochemical treatment system. The system comprises a secondary sedimentation tank (2) connected with a sludge discharge port of a biochemical treatment unit (1), and a pretreatment tank (3), a hydrodynamic cavitation device (4) and a pH regulating tank (5) which are sequentially connected with the secondary sedimentation tank (2). An outlet of the pH regulating tank (5) is connected with the biochemical treatment unit (1) to form a loop, and the hydrodynamic cavitation device (4) and the pretreatment tank (3) form a circulation loop. The method comprises the following steps of introducing the sludge into the pretreatment tank (3), adding acid and alkali for pretreatment, introducing the treated sludge into the venturi tube hydrodynamic cavitation device (4), and sucking the hydrogen peroxide as an oxidant for synergistic cell dissolution during the cavitation process by utilizing the self-suction effect of a venturi tube. Compared with the prior art, the method and the system are low in energy consumption and better in economical efficiency and do not generate the secondary pollution. The closed-loop coupling is formed with a wastewater treatment system, so that the sludge reduction in the biochemical system can be promoted.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a system and method for reducing excess sludge in a wastewater biochemical treatment system. Background technique [0002] In recent years, with the continuous strengthening of sewage treatment in our country, the scale of urban sewage treatment has grown steadily, and my country has become a big country in sewage treatment. According to the Ministry of Housing and Urban-Rural Development, the national output of urban dewatered sludge was close to 22 million tons at the end of 2010, and this value increased to 38.6 million tons in 2017. If the above-mentioned residual sludge production is calculated as 0.3%-0.5% of the sewage volume, the residual sludge volume in my country will reach (5.21-8.68)×10 in 2020 7 tons or so. Excess sludge contains a considerable amount of toxic and harmful substances (such as parasite eggs, pathogenic microorganisms, heavy metals) and unstabilized o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/02
CPCC02F1/52C02F1/66C02F1/722C02F9/00C02F11/02C02F2001/007C02F2303/06
Inventor 朱勇强曹强张艳杨盛淇张战军徐强
Owner SHANGHAI INST OF TECH
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