Waste water treatment method in starch and glucose production

A waste water treatment and glucose technology, which is applied in the field of waste water treatment in the production of starch and glucose, can solve the problems of unfavorable denitrification and denitrification, high discharge of COD per ton, unfavorable full nitrification of ammonia nitrogen, etc., so as to ensure the effect of sewage treatment and reduce waste water The effect of processing costs

Active Publication Date: 2010-11-24
WEIFANG SHENGTAI PHARM CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the A/O biological treatment method has the following problems in the treatment of starch and glucose production wastewater: due to the high COD emission per ton of pollutants discharged from starch production, there are more organic matter in the effluent after anaerobic treatment, and the organic matter load in the subsequent aerobic system is higher. , which is not conducive to the further degradation of organic matter; in addition, after anaerobic treatment of wastewater, high-concentration organic matter is degraded, COD and BOD are reduced, and at the same time, organic nitrogen compounds such as protein contained in wastewater will eventually degrade after entering the anaerobic reactor A high concentration of ammonia nitrogen, such a high concentration of ammonia nitrogen entering the subsequent aerobic treatment system can cause many adverse effects:
[0005] 1. The high concentration of ammonia nitrogen in the anaerobic effluent enters the subsequent aerobic treatment system. Excessively high ammonia nitrogen load will inhibit the activity of nitrifying bacteria and accumulate in one step of nitrifying ammonia nitrogen to nitrite nitrogen. On the one hand, it is not conducive to the nitrification and removal of ammonia nitrogen , on the other hand, since 1mg/L nitrous nitrogen will show as 1.14mg/LCOD in the process of COD determination, the apparent value of COD will increase
[0006] 2. The C/N ratio in the anoxic section is low, which is not conducive to denitrification and denitrification. Hig

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Example Embodiment

[0035] Example 1

[0036] a. The process treated wastewater with COD of 8000mg / L after mixing and buffering enters the anaerobic reactor for anaerobic degradation reaction.

[0037] b. The treated wastewater after anaerobic degradation enters the A pool, the influent COD=1000mg / L, BOD 5 =550mg / L, NH 3 -N = 400mg / L, dissolved oxygen = 0.4mg / L, pH value = 7.6, water temperature is 30 ℃, introduce COD = 5000mg / L, TKN = 35mg / L corn steep liquor evaporation condensate into the A pool to mix, adjust C / N=4.94, carry out anoxic denitrification reaction, and then separate into supernatant and sludge through a precipitation, part of the sludge is returned to tank A, and the rest goes to sludge concentration, and press-filtered into a mud cake and shipped out .

[0038] c. The supernatant liquid after the first precipitation separation enters the O tank for aerobic treatment, and when dissolved oxygen is 2.0 mg / L; pH value = 6.6; temperature = 32 °C, ammonia nitrogen is removed and f...

Example Embodiment

[0048] Example 2

[0049]a. The process wastewater with COD of 10000mg / L is mixed and buffered and then enters the anaerobic reactor for anaerobic degradation reaction.

[0050] b. The treated wastewater after anaerobic degradation enters the A pool, the influent COD=1200mg / L, BOD 5 =660mg / L, NH 3 -N = 550mg / L, dissolved oxygen = 0.4mg / L, pH value = 7.3, water temperature is 30 ℃, introduce COD = 4500mg / L, TKN = 40mg / L corn steep liquor evaporation condensate water into A pool to mix, adjust C / N=4.15, carry out anoxic denitrification reaction, and then separate into supernatant and sludge through a precipitation, part of the sludge is returned to tank A, and the rest is used for sludge concentration, and press-filtered into a mud cake and shipped out .

[0051] c. The supernatant liquid after a precipitation separation enters the O tank for aerobic treatment, and when the dissolved oxygen is 2.5 mg / L; pH value = 6.4; temperature = 32 °C, ammonia nitrogen removal and furthe...

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Abstract

The invention discloses a waste water treatment method in starch and glucose production, wherein the waste water comprises corn steep liquor evaporative condensate water and processing waste water. The method comprises the following steps: a. firstly performing an anaerobic degradation reaction on the processing waste water after mixing and buffering; b. mixing the processing waste water treated by anaerobic degradation with the corn steep liquor evaporative condensate water, and performing an anaerobic denitrification reaction; c. performing an aerobic reaction on the waste water treated by the anaerobic denitrification reaction, and carrying out ammonia nitrogen removal and further degradation; and d. adding flocculants to the waste water treated by the aerobic reaction to perform a coagulation reaction, and removing suspended matters from the waste water before discharging. By comprehensively utilizing industrial waste water produced in the starch and glucose production in the waste water treatment to achieve the purpose of treating waste with waste, the method ensures the waste water treatment effect and simultaneously reduces the waste water treatment cost.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a waste water treatment method in the production of starch and glucose. Background technique [0002] The starch and glucose production process using corn as raw material can produce a large amount of wastewater, including corn steep liquor evaporation condensate and process treatment wastewater, of which process treatment wastewater includes fiber washing, flotation concentration, protein press filtration and other processes in the starch production process The produced process wastewater, and the regenerated water and circulating cooling water of the ion exchange system in the subsequent glucose production process. [0003] Pollutants in cornstarch and glucose wastewater are mainly soluble organic matter such as starch, soluble protein, sugar, and organic acid. In addition, they also contain insoluble organic matter such as protein powder, corn bran, and inorganic substances ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/32
Inventor 刘清太孟祥婷张海玲钱磊闫令军
Owner WEIFANG SHENGTAI PHARM CO LTD
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