Seeking methods for treating high-concentration organic wastewater

The biochemical quality is acceptable, but the concentration is high; it’s necessary to remove any suspended solids first before considering whether it can be reused. I’m not sure if the water volume is high; if it’s not, dilute it

I remember that when I went to Hainan in 2006 to inspect projects, there was a starch factory there. They used biochemical methods for treating their wastewater, involving both anaerobic and aerobic processes. However, their treatment after the aerobic stage wasn’t very effective; some parameters in the wastewater still didn’t meet the standards. Overall, though, the treatment results were good, mainly because the operating costs were low – otherwise, the factory’s profits would have dropped significantly.

Reuse is no longer possible; the water volume is very high, reaching tens of thousands of tons per day. After using anaerobic and aerobic treatment methods, the COD level can only be reduced to around 500, while the standard requirement is 100

Try performing pre-treatment of suspended solids first, followed by anaerobic-aerobic treatment and then an additional anaerobic treatment step.

1. Treatment of starch wastewater using the dosed air flotation-UASB-SBR process: http://www.studa.net/huanjing/060306/13233582.html; an additional sand filtration stage can even be added. 2. Currently, UASB+A/O is commonly used; see if that can be helpful to you. This post was last edited by Fightinghard on 2009-3-24 21:55.]

Due to the high COD and high organic matter concentration in starch wastewater, both anaerobic and aerobic treatment processes are necessary. Additionally, the SS level in starch wastewater is also high, so pretreatment is required beforehand; air flotation can be used. A combination of air flotation + UASB + contact oxidation is sufficient to treat conventional starch wastewater. However, treating wastewater generated from modified starch production is much more difficult, as its biodegradability is low, necessitating oxidative pretreatment prior to further treatment.

It’s better to consider recycling~~ The cost of dealing with high concentrations is too high~~~

There are quite a few successful cases for this; give it a look.

The mention of the ninth floor is necessary! If the COD in wastewater exists in the form of large-molecule organic substances, adding ferric chloride can help to precipitate and remove a large portion of these organic substances, thereby reducing the burden on subsequent treatment processes! Of course, if the organic matter is in an emulsified state, measures such as air flotation need to be considered!

If the amount of wastewater is large, there is a technology called microwave treatment; there is a company that offers this service in Beijing

Is there a suitable flocculant for precipitation? If the membrane filtration + A2O process is not considered

Wastewater from starch production enterprises contains a COD level of around 20,000 mg/l and a BOD level of around 10,000 mg/l. Such high-concentration organic wastewater needs to undergo anaerobic treatment first to produce methane for utilization; thereafter, the suspended solids can be removed through sedimentation, and after that, aerobic aeration treatment can be carried out to ensure that the wastewater meets regulatory standards. Based on experience, an IC reactor should be used for anaerobic treatment, while the SBR process is suitable for aerobic treatment. In this process, since anaerobic treatment is a capacity-generating process, the biogas produced can be used to fuel boilers or for power generation. Although aerobic treatment is energy-intensive, the overall operating costs are not high, and no coagulants are required during operation to meet the standards.

As a supplementary note, approximately 0.4–0.5 cubic meters of biogas can be produced per kilogram of COD.

If there is a large amount of SS in the upstream water, it is recommended to use methods such as air flotation to remove most of it, as too high a SS content can affect the efficiency of the subsequent anaerobic treatment process. Moreover, the concentration of pollutants in the water after anaerobic and aerobic treatment is 500, and there are various reasons why this level does not meet the discharge standards. It is suggested that the person asking the question list out the process details and various parameters so that everyone can analyze the situation better.

Starch wastewater is very easy to treat. The technology is relatively mature; anaerobic biogas can be used for power generation and to produce steam for industrial use ； The wastewater after anaerobic treatment can be used for agricultural irrigation, or it can be discharged after aerobic treatment or reused as process water in manufacturing processes ； Anaerobic and aerobic sludge and residues can be used as biofertilizers. It solves environmental protection problems while also generating certain economic benefits. If you are interested, feel free to contact me: li_pansr@163.com I can show you some examples!

I don’t know what the requirements for the water output are. Pre-treatment, such as simple flocculation and sedimentation, followed by thorough anaerobic treatment and then aerobic treatment. After that, carry out the post-processing properly.

Guangxi Boshike Environmental Protection Technology Co., Ltd. is a joint venture with Guangxi University and has extensive experience in treating high-concentration organic wastewater. It has achieved considerable success in dealing with wastewater from sugar mills, where the COD level is above 50,000 mg/L.

Good reference material, mark it

After biochemical treatment, carrying out coagulation and sedimentation treatment once more should be fine; that’s exactly what we do