Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion

A technology of excess sludge and magnesium ammonium phosphate, applied in chemical instruments and methods, sludge treatment, sludge treatment, etc., can solve the problems of high pH value and discomfort subsequent treatment, and achieve the saving of chemical consumption, stable gas production process, The effect of promoting the methanogenesis process

Active Publication Date: 2014-04-02
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0008] The present invention provides an integrated process of alkaline hydrolysis pretreatment-ammonium magnesium phosphate method to recover phosphorus and nitrogen-anaerobic digestion to produce methane to treat excess sludge, which solves the problem that the high pH value of the sludge after alkaline hydrolysis pretreatment is not suitable for subsequent treatment, and at the same time , integrated ammonium magnesium phosphate method to recover phosphorus and nitrogen technology and anaerobic digestion methane production technology, as the follow-up treatment of alkaline hydrolysis pretreatment sludge, recover phosphorus, nitrogen and biomass energy in sludge, and realize comprehensive sludge treatment as a resource use

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  • Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion
  • Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion

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Embodiment 1

[0040] (1) The remaining sludge in the urban sewage treatment system is concentrated or diluted by gravity to a concentration of 20 g / L, which is equivalent to a water content of 98%.

[0041] (2) if figure 2 As shown, in the first-stage alkaline hydrolysis reactor A, inject X volume of pretreated excess sludge 1, its concentration is 20 g / L, which is equivalent to a water content of 98%, stir at 150rpm, and perform alkaline hydrolysis for 1 hour to make The pH is controlled at 8.5-10.0. Then centrifuge to discharge the supernatant, that is, the first-stage alkaline hydrolysis effluent 6, and discharge the system; the residue after centrifugation, that is, the first-stage alkaline hydrolysis residue 2, is injected into the second-stage alkaline hydrolysis reactor. In the second-stage alkaline hydrolysis reactor B, inject 3 / 7X volume of water, adjust the pH to 13.0 with 10M sodium hydroxide solution while stirring at 150rpm, continue the alkaline hydrolysis reaction for 1h, a...

Embodiment 2

[0046] (1) The remaining sludge in the urban sewage treatment system is concentrated or diluted by gravity to a concentration of 20 g / L, which is equivalent to a water content of 98%.

[0047] (2) if figure 2 As shown, in the first-stage alkaline hydrolysis reactor A, inject X volume of pretreated excess sludge 1, its concentration is 20 g / L, which is equivalent to a water content of 98%, stir at 150rpm, and perform alkaline hydrolysis for 1 hour to make The pH is controlled at 8.5-10.0. Centrifuge to discharge the supernatant, that is, the first-stage alkaline hydrolysis effluent 6, and discharge the system; the residue after centrifugation, that is, the first-stage alkaline hydrolysis residue 2, is injected into the second-stage alkaline hydrolysis reactor. In the second-stage alkaline hydrolysis reactor B, inject 3 / 7X volume of water, adjust the pH to 13.0 with 10M sodium hydroxide solution while stirring at 150 rpm, and continue the alkaline hydrolysis reaction for 1 hou...

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Abstract

The invention discloses a method for processing residual sludge with an integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on a magnesium ammonium phosphate method and methane production based on anaerobic digestion. The method comprises the steps of: preprocessing residual sludge with a secondary alkaline hydrolysis method to obtain supernate, adding a magnesium salt solution to separate precipitates, subjecting the supernate to anaerobic processing, and drying the precipitates naturally to obtain crude magnesium ammonium phosphate; injecting the supernate into an anaerobic reactor, and inoculating with 10-60% anaerobic granular sludge, wherein the volumetric loading is controlled to be 0.30-0.75kg COD (Chemical Oxygen Demand) / (m<3>.d), and the productivity of methane reaches 200-400mL CH4 / gCOD within 72h. The method disclosed by the invention has the advantages that nutrition elements in the residual sludge are utilized comprehensively, the process is simple and is consistent in flow with low chemical consumption and electricity consumption, methane is recovered while crude magnesium ammonium phosphate is obtained, moreover, residual alkaline solids are beneficial to subsequent processing, and the reduction, stabilization and recycling of the residual sludge are realized comprehensively.

Description

technical field [0001] The invention relates to a method for comprehensive sludge treatment and resource utilization, belonging to the field of water treatment. In particular, it relates to an integrated process of alkaline hydrolysis pretreatment-ammonium magnesium phosphate method to recover phosphorus and nitrogen-anaerobic digestion to produce methane to treat excess sludge. [0002] Background technique [0003] With the acceleration of urbanization in my country, the discharge of urban sewage continues to increase, and the amount of sludge, especially the excess sludge, produced by sewage treatment plants is increasing. It is estimated that by 2015, the amount of remaining sludge will reach 7.594 million tons, and this value will continue to increase for a period of time. Generally, sludge treatment and disposal costs account for more than 50% of the total operating costs of sewage treatment plants, requiring huge capital investment. At the same time, due to the soc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
CPCY02E50/343Y02E50/30Y02W10/20
Inventor 胡勇有李义勇王广华毕薇于子淇毕祺熊旭华
Owner SOUTH CHINA UNIV OF TECH
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