Method for simultaneously and selectively removing nitrate and phosphate from secondary biochemical effluent

A technology for secondary biochemical effluent and nitrate, which is applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., and can solve problems such as the influence of competitive adsorption that is rarely considered

Inactive Publication Date: 2013-10-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few reports on the simultaneous removal of nitrate and phosphate in the secondary effluent of sewage treatment plants using adsorption technology, and little consideration is given to the ubiquitous SO in water bodies. 4 2－ 、HCO 3 - , Cl － Competitive Adsorption Effects of Coexisting Anions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Put 2.5ml of Dowex M4195 into a glass adsorption column of Ф1.0cmх20cm, and pass 0.1% (W / W), Cu(II) solution with pH=3.5 through the adsorption column to load metal ions. After loading, it is recorded as Dowex M4195-Cu, then washed to neutral with deionized water.

[0023] (2) Put 2.5ml Purolite A520E into a glass adsorption column of Ф1.0cmх20cm, add 1cm high glass wool on top, and then put 2.5ml of Dowex M4195-Cu obtained in step (1), and pass through the containing NO 3 - -N (15 mg / l), PO 4 3- -P (5mg / l), SO 4 2- (150mg / l) secondary biochemical effluent (solution pH 8.0), the adsorption rate is 18BV / h. When the adsorption column outlet NO 3 - -N up to 5mg / l, PO 4 3- When -P reached 0.5mg / l, the adsorption was stopped. The working adsorption capacity is: NO 3 - -N: 62g / l, PO 4 3- -P: 205 g / l. NO 3 - -N to SO 4 2- The selectivity coefficient is 95, PO 4 3- -P to SO 4 2- The selectivity coefficient is 1081.

[0024](3) Pass the sodium chlori...

Embodiment 2

[0026] The steps are the same as in Example 1, but the Dowex M4195 resin in the steps is replaced by Dowex XFS43084 resin, and other conditions remain unchanged, and the working adsorption capacity is: NO 3 - -N: 68g / l, PO 4 3- -P: 215g / l, the desorption rate is 97%. NO 3 - -N to SO 4 2- The selectivity coefficient is 103, PO 4 3- -P to SO 4 2- The selectivity coefficient is 1056.

Embodiment 3

[0028] Step is the same as Example 1, but the Dowex M4195 resin in the step is changed to Reillex 405 resin, other conditions are unchanged, and the working adsorption capacity is: NO 3 - -N: 71g / l, PO 4 3- -P: 198g / l, the desorption rate is 98%. NO 3 - -N to SO 4 2- The selectivity coefficient is 103, PO 4 3- -P to SO 4 2- The selectivity coefficient is 1214.

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PUM

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Abstract

The invention discloses a method for simultaneously and selectively removing nitrate and phosphate from secondary biochemical effluent, and belongs to the technical field of water pollution deep treatment. The method comprises the steps of: processing a mixed solution simultaneously containing nitrate, phosphate and other soluble coexisting anions by a double-layer fixed bed adsorption column containing polyvinyl pyridine transition metal complex and strong-basicity anion exchange resin, wherein polyvinyl pyridine transition metal complex is located at the upper part of the adsorption column and the strong-basicity anion exchange resin is located at the lower part of the adsorption column; and desorbing the adsorption column with nitrate and phosphate by using sodium chloride solution, wherein the adsorption column subjected to desorption can be recycled. Through treatment according to the method, NO3<->-N content at the outlet of the adsorption column is reduced to less than 5 mg / L and PO4<3->-P content is reduced to less than 0.5 mg / L; and by the method, synchronous deep removal of low-concentration nitrate and phosphate from secondary effluent of a wastewater treatment plant can be achieved.

Description

technical field [0001] The invention relates to a method for removing phosphate and nitrate in water, more specifically a method for selectively removing nitrate and phosphate in urban sewage after being treated by a secondary biochemical method. Background technique [0002] Nitrogen and phosphorus are the main elements that cause eutrophication of water bodies. The discharge of industrial and urban sewage treatment plants is considered to be the main source of N and P that cause eutrophication of receiving water bodies. Since the implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) on July 1, 2003, my country has put forward strict requirements for ammonia nitrogen, TN, and TP in the effluent of urban sewage treatment plants (TN < 15 mg / L ,TP < 0.5 mg / L). At present, domestic urban sewage is generally treated by secondary biochemical methods, but due to problems such as carbon sources, sludge age, and nitrates in con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/42C02F1/58
Inventor 龙超史嘉璐伊胜楠章亮吴剑李丽李爱民
Owner NANJING UNIV
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