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Ammonia nitrogen processing method for hide manufacture wastewater

A technology of tannery wastewater and treatment method, applied in the advanced treatment and reuse of secondary effluent, zeolite-autotrophic, heterotrophic bacterial biological filter to treat ammonia nitrogen in tannery wastewater, can solve the problems of industrial wastewater treatment, can not be Treating industrial wastewater, low ammonia nitrogen removal and other problems, to achieve the effect of improving capacity, reducing power consumption and improving efficiency

Inactive Publication Date: 2010-06-09
ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's overall requirements for wastewater treatment in tannery factories must meet the treatment requirements before entering urban sewage treatment plants (referred to as secondary effluent from tannery). At present, the common problem in the country is that other indicators of wastewater from tannery industries basically meet the requirements. , but the ammonia nitrogen cannot reach the standard, which is a serious problem that plagues the treatment of industrial wastewater in various tanneries
This technology has the following deficiencies: (1) It can only treat low-concentration domestic sewage, sewage containing low ammonia nitrogen, and cannot treat industrial wastewater; (2) Natural microorganisms are used in the biological aerated filter, naturally growing microorganisms, survival of the fittest , what kind of microorganisms may reproduce, but the efficiency of removing ammonia nitrogen is not high; (3) The operating cost is high, because the water-air ratio is as high as 1:1-1:3, and the recoil process has three stages, and the power consumption is large

Method used

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  • Ammonia nitrogen processing method for hide manufacture wastewater
  • Ammonia nitrogen processing method for hide manufacture wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Nitrobacter opacus Sack cultivation:

[0028] Medium preparation: sodium nitrite 1kg; sodium carbonate 1kg; dipotassium hydrogen phosphate 0.75kg; magnesium sulfate 0.03kg; manganese sulfate 0.01kg; pH 6.5, water to 1000L;

[0029] Nitrobacter opacus Sack was inoculated and cultured with shaking at 24° C. for 5 days to obtain a Nitrobacter opacus Sack culture (a mixture of bacterium and culture medium).

[0030](2) Nitrosomonas monocella Nelson cultivation:

[0031] Medium preparation: dipotassium hydrogen phosphate 1kg; ammonium sulfate 0.5kg; calcium chloride 7.5kg; sodium chloride 0.3kg; magnesium sulfate 0.03kg; iron sulfate 0.03kg;

[0032] Nitrosomonas monocella Nelson was inoculated and aerated at 24° C. for 5 days to obtain a culture of Nitrosomonas monocella Nelson (a mixture of bacterium and culture medium).

[0033] (3) Culture of Rhodopseudomonas seudanonas palustris: medium preparation: 10 kg of glucose; 1 kg of potassium nitrate; 0.5 kg of calcium ch...

Embodiment 2

[0036] General treatment of secondary effluent from tanning: biofilter with a height of 2.5m, filled with clinoptilolite fillers with particle sizes of 50mm, 20mm, and 5mm (from bottom to top) at a volume ratio of 1:1:1 (Jinyun, Zhejiang) , the exchange capacity of ammonia nitrogen is 5~10kg / m 3 . Put 20kg of Nitrobacter opacus Sack culture and Nitrosomonas monocella Nelson culture cultured in Example 1 into the oxygen supply treatment area, ventilate at intervals of 15 minutes per hour, and run continuously for 15 to 20 days to make it hang film on the filler The anoxic treatment area puts in 30kg of the culture of Rhodopseudomonas seudanonas palustris cultivated in Example 1, and runs continuously without ventilation for 20 to 30 days to make it form a film on the filler. The secondary effluent of tannery runs for 40 minutes in the oxygen supply treatment area and the anoxic treatment area respectively, the COD of the secondary effluent of tannery is reduced from 100-200mg / ...

Embodiment 3

[0038] Advanced treatment of tannery secondary effluent: biofilter with a height of 3.5m, filled with clinoptilolite fillers with particle diameters of 50mm, 20mm, and 5mm (from bottom to top) at a volume ratio of 1:1:1, and exchange of ammonia nitrogen The capacity is 5~10kg / m 3 . The oxygen supply treatment area is put into the culture of Nitrobacter opacus Sack cultivated in Example 1 and 25 kg of the culture of Nitrosomonas monocella Nelson, each of which is ventilated at intervals of 15 minutes per hour, and runs continuously for 15 to 20 days to make it hang film on the filler; Put 40kg cultured culture of Rhodopseudomonas seudanonas palustris in the anoxic treatment area, and run it continuously without ventilation for 20-30 days to make it hang film on the filler. The secondary effluent of tanning was run for 60 minutes in the oxygen supply treatment area and the anoxic treatment area respectively, and the COD of the secondary effluent of tanning was reduced from 100-...

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Abstract

The invention provides an ammonia nitrogen treatment method of tanning waste water. The method comprises the following step that: a biological filter 1 is filled with clinoptilolite and then autotrophic nitrobacteria are fed in the filter 1 to carry out cultivation and biofilm formation (need to be carried out under the conditions of oscillation or ventilation because the nitrobacteria are aerobes); a biological filter 2 is filled with clinoptilolite and then heterotrophic denitrifying bacteria are fed in the filter 2 to carry out the cultivation and the biofilm formation (can be carried out just under a static condition because the denitrifying bacteria are anaerobes); the tanning waste water is fed in the biological filter 1 first so as to carry out oxygen supply treatment for 40 to 60 minutes; and then, waste water discharged from the biological filter 1 is fed into the biological filter 2 to carry out anaerobic treatment for 40 to 60 minutes. The ammonia nitrogen treatment method has the following main advantages that: COD in the secondary effluent of the tanning waste water can be reduced from 100 to 200mg / L to 40 to 80mg / L, while ammonia nitrogen content is reduced from 40 to200mg / L to 10 to 35mg / L and total nitrogen is reduced by approximately 60 percent; therefore, the secondary effluent meets the requirements of treatment before the secondary effluent is fed into an urban sewage disposal plant; moreover, the ammonia nitrogen treatment method has large biofilm formation quantity, high ammonia nitrogen removing efficiency and lower cost of equipment and operation.

Description

(1) Technical field [0001] The invention relates to a method for treating ammonia nitrogen in tannery wastewater, in particular to a method for treating ammonia nitrogen in tannery wastewater with a zeolite-autotrophic and heterotrophic bacterial biological filter, and relates to the advanced treatment of the secondary effluent of biochemical treatment of tannery wastewater and Reuse. (2) Background technology [0002] The leather industry is closely related to the lives of the people in our country and occupies a very important position in the national economy. However, the tanning industry discharges more than 100 million tons of waste water to the environment every year. Its characteristics are: high alkalinity, deep color, high oxygen consumption, high suspended solids, and more toxic substances such as sulfide and chromium. It belongs to industrial wastewater that is seriously polluted and difficult to treat. [0003] As the sustainable development strategy has become...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 郑展望周晓云芦国营
Owner ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD
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