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Method for increasing sewage-reinforced biological phosphor-removing effect by resource utilizing mud organic substance

A biological phosphorus removal and recycling technology, which is applied in the field of resource utilization and utilization of sludge organic matter to improve the effect of biological phosphorus removal in sewage, can solve the problem that the phosphorus content in the effluent does not meet the discharge standard, and achieve the effect of improving the phosphorus removal effect

Inactive Publication Date: 2007-11-14
TONGJI UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Thomas et al conducted a field study at the Noosa sewage plant and found that by adding the fermentation liquid of the primary sludge, the biological phosphorus removal effect of the sewage can be appropriately improved, but the phosphorus content of the treated effluent does not meet the discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Place 10L of the concentrated excess sludge in a 15L reactor, adjust the pH value to 10 with NaOH solution, stir anaerobic for 8 days at room temperature (about 20°C), centrifuge the sludge, and collect the supernatant, Wherein, the supernatant contains organic acid;

[0021] (2) adopt struvite precipitation method, add MgCl in the supernatant liquor obtained in step (1) 2 , MgCl 2 The addition amount is that Mg / P is 1.8 mol / 1 mol, and stirred for 5 minutes, so that the phosphate and ammonia nitrogen and Mg ions contained in the supernatant form a magnesium ammonium phosphate precipitate, and then centrifuged to obtain a treatment solution containing an organic acid. ;

[0022] (3) adding the treatment solution obtained in step (2) to the urban sewage to be treated, the COD of the urban sewage to be treated is 200 mg / L, and the total phosphorus (TP) is 8.68 mg / L. Add 10 mL of treatment solution per liter of urban sewage to be treated, so that the COD of urban sew...

Embodiment 2

[0026] The urban sewage to be treated in the step (3) of Example 1 is not added to the treatment solution obtained in the step (2) to directly carry out biological phosphorus removal, and its operation is the same as the steps (3), (4), (5) of Example 1. . The effluent results after operation: CODCr is 23mg / L, TP is 1.87mg / L, and the effluent quality does not meet the first-class discharge standard of the sewage treatment plant.

[0027] Comparing Examples 1 and 2, it can be seen that adding organic acid produced by sludge fermentation under alkaline conditions to actual sewage (ie, Example 1) can significantly improve the phosphorus removal effect of sewage.

Embodiment 3

[0029] (1) Place 10L of the concentrated excess sludge in a 15L reactor, adjust the pH value to 10 with NaOH solution, stir anaerobic for 10 days at room temperature (about 20°C), centrifuge the sludge to collect the supernatant, Wherein, the supernatant contains organic acid;

[0030] (2) adopt the struvite precipitation method, in the supernatant liquid obtained in step (1), add MgSO 4 , MgSO 4 The amount of addition is that Mg / P is 1.6mol / 1mol, stirred for 3 minutes, and the phosphate and ammonia nitrogen and Mg ions contained in the supernatant form magnesium ammonium phosphate precipitation, and then centrifuged to obtain the treatment solution;

[0031] (3) adding the treatment solution obtained in step (2) to the urban sewage to be treated, and the COD in the urban sewage to be treated Cr is 150 mg / L, TP is 5.58 mg / L, and 15 mL of the treatment solution obtained in step (2) is added to each liter of municipal sewage, so that the COD of the sewage is 300 mg / L. Under t...

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Abstract

This invention belongs to new style green technology region, concretely relates to a method of using sludge organic matter to advance biologic dephosphorization effect of sewage. Excess sludge at basicity condition is carried out anaerobic fermentation to produce organic acid; adopt guano precipitation means to reclaim nitrogen and phosphorus of organic acid; add the treatment fluid after reclaiming nitrogen and phosphorus to municipal sewage, under anaerobic-aerobic condition aerobic conditito carry out biological sewage treatment,through solid-liquid separation, the out water reaches the mark and is discharged. This invention through the method of adding excess sludge broth to sewage, not only advance the ability of microbe of synthesizing poly- hydroxy valeric acid(PHV)under anaerobic condition, advance availability of poly- hydroxy eicosanoic acid, decrease glycogen metabolization quantity, in favor of maintaining higher dephosphorization effect at aerobic condition, reduce phosphorus concentration in the out water, prevent water substance eutrophication occurring, but also decrease sludge volume, thereby decrease sludge treatment cost and pollute to environmental.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for recycling sludge organic matter to improve sewage and enhancing biological phosphorus removal effect. Background technique [0002] Short-chain fatty acids are important carbon sources for enhanced biological phosphorus removal (EBPR) microorganisms. Because domestic sewage usually has low COD and less available carbon sources, it is not conducive to the operation of the EBPR process, and usually requires additional carbon sources (such as acetic acid, etc.), which is not economical and practical for the actual operation of sewage plants. In recent years, some literatures have reported on the fermentation of sewage sludge to produce acid and use it to improve the effect of biological phosphorus and nitrogen removal. Thomas et al. conducted an on-site study in the Noosa WWTP and found that by adding the fermentation broth of primary sludg...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/04C02F1/58C02F1/38C02F3/30C02F1/52
Inventor 陈银广佟娟顾国维
Owner TONGJI UNIV
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