Method for treating metallurgy wastewater and recycling resources
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A technology for resource recovery and sewage treatment, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve double improvement of ecological and economic benefits, stable reaction process, and stable properties
Inactive Publication Date: 2015-01-07
HUNAN MIAOXIN ENVIRONMENTAL PROTECTION TECHCO
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Abstract
Description
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Problems solved by technology
[0003] In order to overcome the shortcomings of the above-mentioned existing single technology, the purpose of the present invention is to provide a method for metallurgical sewage treatment and resource recycling that is simple, reliable, low in operating cost, and good in environmental protection and economic benefits
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0017] 800ml of metallurgical sewage is treated, heated to 40°C, the reducing agent is sodium sulfite solution with a concentration of 10%, and the input amount of NaOH is 2%. The ammonia nitrogen in the sewage is removed by the stripping method, the pH value is adjusted to 12, the temperature is 40 °C, the gas-liquid ratio is 1800, and the stripping time is 5 hours. access to CO 2 , reduce the PH value of sewage to 8, the dosage of zeolite is 5%, and the contact time is 50 minutes.
[0018] Indicators before sewage treatment
[0019] Ammonia nitrogen mg / l
Cr 3+ mg / l
V 5+ mg / l
Fe 2+ mg / l
pH
8231
1218
232.5
582.3
2.4
[0020] Indicators after sewage treatment
[0021] Ammonia nitrogen mg / l
Embodiment 2
[0023] Treat 800ml of metallurgical sewage, heat to 30°C, 3% basic copper carbonate, 10% sodium sulfite solution as reducing agent, and 2% CaO solution. Remove ammonia nitrogen in sewage by stripping method, adjust pH value to 11.5, temperature 30℃, gas-liquid ratio 2000, stripping time 5 hours, pass CO 2 , reduce the PH value of sewage to 8. The dosage of zeolite was 5%, and the contact time was 50 minutes.
[0024] Indicators before sewage treatment
[0025] Ammonia nitrogen mg / l
Cr 3+ mg / l
V 5+ mg / l
Fe 2+ mg / l
pH
8231
1182.3
182.4
492.9
2.3
[0026] Indicators after sewage treatment
[0027] Ammonia nitrogen mg / l
Embodiment 3
[0029] Treat 800ml of metallurgical sewage, heat it to 35°C, the reducing agent is ammonium sulfite solution with a concentration of 3%, and the concentration of NaOH solution is 8%. Remove ammonia nitrogen in sewage by stripping method, adjust pH value to 12, temperature 35°C, gas-liquid Compared with 2000, the stripping time is 6 hours, and CO2 is introduced to reduce the pH value of the sewage to 8.5. The dosage of zeolite was 6%, and the contact time was 60 minutes.
[0030] Indicators before sewage treatment
[0031] Ammonia nitrogen mg / l
Cr 3+ mg / l
V 5+ mg / l
Fe 2+ mg / l
pH
8231
1079.2
153.8
476.1
2.2
[0032] Indicators after sewage treatment
[0033] Ammonia nitrogen mg / l
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Abstract
The invention relates to the technical field of environmental protection and in particular relates to a method for treating metallurgy wastewater with high content of chrome alum and ammonia nitrogen and recycling resources. The method comprises the following steps: heating the wastewater to 30-80 DEG C; adding a reducing agent accounting for 2-8% of the wastewater amount and reacting for 10-30 minutes; adding an alkaline solution and adjusting the pH value of the wastewater to 11-12; removing the ammonia nitrogen by a blow-off method for 4-8 hours at the temperature of 30-50 DEG C according to a gas-liquid ratio of 1500 to 2500; filtering and precipitating, collecting precipitate, and adding CO2 to adjust the pH value of the wastewater to 7-9; adding zeolite accounting for 3-10% of the wastewater amount and reacting for 30-120 minutes. The reducing agent adopts sodium sulfite and is stable in property and free of toxicity and harmless; the wastewater is adjusted to be alkaline by a lime-alkali solution, so that the operation cost is low; the content of chromium in the filter cake after filtering is greater than 35%; the ammonia nitrogen is removed by the blow-off method, so that the removal rate can reach over 90%; the zeolite is taken as an adsorbent; the process is simple; the reaction process is stable; the low-concentration metal ions and the ammonia nitrogen are removed; the discharged water can reach the specific industrial emissions standard in China.
Description
technical field [0001] The invention relates to the technical field of environmental protection. In particular, it is a method for treating metallurgical sewage containing high chromium vanadium and ammonia nitrogen and recycling resources. Background technique [0002] The metallurgical industry has a wide variety of different production processes and a large amount of sewage in the production process. It is a high-pollution and high-energy-consumption industry. Environmental protection problems are becoming more and more prominent, and the national environmental protection policy has been continuously strengthened. Therefore, the metallurgical industry must choose appropriate sewage treatment processes and recycling. Reuse technology, many sewage produced by hydrometallurgy are characterized by relatively high content of metal ions such as chromium vanadium and ammonia nitrogen. At present, the practical processes for treating ammonia nitrogen wastewater mainly include: b...
Claims
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Application Information
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