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Pretreatment method for two-stage electrochemical enhancement of sludge anaerobic digestion performance

An anaerobic digestion and pretreatment technology, applied in the direction of electrochemical sludge treatment, sludge treatment, sludge treatment, etc., can solve the problem of low methane production efficiency, shorten the anaerobic digestion cycle, and increase the rate of anaerobic digestion , the effect of strengthening anaerobic digestion performance

Active Publication Date: 2019-09-03
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to overcome the shortcoming of low methane production efficiency of sludge anaerobic digestion at present, and improve the anaerobic digestion performance of sludge through the synergistic effect of segmented electrochemical pretreatment and anaerobic digestion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The excess sludge was obtained from a sewage treatment plant in Minhang District, Shanghai. Through sedimentation and centrifugal concentration, the concentration of the treated sludge was measured to be 32g DS / L. Before the two-stage electrochemical pretreatment, the excess sludge was adjusted The pH drops below 6.0. The two-stage electrochemical pretreatment adopts forward and reverse pulse-type adjustable power supplies respectively; the conditions of the first stage electrochemical pretreatment are voltage 100V, treatment time 5min, and electrode plate spacing 2cm. Then, the second stage of electrochemical pretreatment is carried out, the condition is that the voltage is 5V, the treatment time is 15min, and the distance between the plates is 3cm. After the two-stage electrochemical pretreatment, the sludge is pumped into the digestion tank from the electrochemical pretreatment reaction device after standing for 4 hours. In the start-up stage of sludge anaerobic dig...

Embodiment 2

[0023] The excess sludge was obtained from a sewage treatment plant in Minhang District, Shanghai. Through sedimentation and centrifugal concentration, the concentration of the treated sludge was measured to be 28g DS / L. Before the two-stage electrochemical pretreatment, the excess sludge was adjusted The pH drops below 6.0. The two-stage electrochemical pretreatment uses forward and reverse pulse-type adjustable power supplies respectively; the conditions of the first stage electrochemical pretreatment are voltage 200V, treatment time 30min, and electrode plate spacing 3cm. Then, the second stage of electrochemical pretreatment is carried out, and the conditions are as follows: the voltage is 20V, the treatment time is 60min, and the distance between the plates is 4cm. After the two-stage electrochemical pretreatment, the sludge is pumped into the digestion tank from the electrochemical pretreatment reaction device after standing still for 8 hours. In the start-up stage of s...

Embodiment 3

[0025]The excess sludge was obtained from a sewage treatment plant in Minhang District, Shanghai. Through sedimentation and centrifugal concentration, the concentration of the treated sludge was measured to be 29g DS / L. Before the two-stage electrochemical pretreatment, the excess sludge was adjusted The pH drops below 6.0. The two-stage electrochemical pretreatment uses forward and reverse pulse-type adjustable power supplies respectively; the conditions of the first stage electrochemical pretreatment are voltage 150V, treatment time 15min, and electrode plate spacing 4cm. Then, the second stage of electrochemical pretreatment is carried out, and the conditions are as follows: the voltage is 10V, the treatment time is 45min, and the distance between the plates is 2cm. After the two-stage electrochemical pretreatment, the sludge is pumped into the digestion tank from the electrochemical pretreatment reaction device after standing still for 6 hours. In the start-up stage of sl...

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Abstract

The invention discloses a pretreatment method of two-stage electrochemical reinforcement of the anaerobic digestion performance of sludge. The method is composed of two parts, i.e., two-stage electrochemical pretreatment and anaerobic fermentation of sludge. Through the electrochemical pretreatment, residual sludge of a sewage treatment plant is improved in the performance of anaerobic digestion for production of biogas. Specifically, residual sludge from the sewage treatment plant is concentrated, then subjected to the two-stage electrochemical pretreatment and then added into an anaerobic fermentation tank. Through reinforcement of the two-stage electrochemical pretreatment, the accumulative methane output after anaerobic digestion of the residual sludge from the sewage treatment plant is increased by 0.5 to 1.5 times and retention time needed for stabilization of the sludge is reduced by 5 to 9 d compared with one-stage electrochemical pretreatment with same energy consumption. The method is applicable to treatment of the residual sludge of the sewage treatment plant and recovers biomass energy included in organic matters in recovered sludge in the form of methane; and the method is also applicable to reconstruction of conventional anaerobic digestion systems for sludge so as to improve the benefits of anaerobic digestion of sludge.

Description

technical field [0001] The invention relates to the technical field of sludge anaerobic digestion strengthening treatment, in particular to a two-stage electrochemically enhanced sludge anaerobic digestion performance pretreatment method. Background technique [0002] With the continuous development of the national economy, the discharge of industrial wastewater and domestic sewage in cities and towns in my country continues to increase. In the sewage treatment process, dry sludge accounting for 0.02% of the sewage volume is generally produced, so the amount is huge. With the continuous construction of sewage treatment plants and stricter environmental standards, the output of sludge will further increase. One of the municipal solid wastes that need to be treated urgently. For the treatment and disposal of sludge generated by urban sewage treatment plants, the main methods can be divided into 34 kinds of technologies: aerobic digestion, anaerobic digestion, sludge drying, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/00
CPCC02F11/006C02F11/04C02F2303/06Y02E50/30Y02W10/20
Inventor 袁海平朱南文楼紫阳沈棒王辉胡静
Owner SHANGHAI JIAOTONG UNIV