Treatment of high-concentration biochemical wastewater?
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The wastewater contains waste microbial cells resulting from production, with a CODcr value of over 10,000; it is also alkaline in nature. Which treatment process is most suitable for treating such wastewater at present? This post was last edited by ntdbm on 2009-4-13 20:39]
It seems that your wastewater is generated by biochemical processes, and it likely comes from the pharmaceutical industry. Physical-chemical treatment plus biochemical treatment is sufficient. Substances that physically remove dead cells and large molecules. Biochemical treatment deals with soluble pollutants, such as solvents and organic substances released upon the dissolution of bacterial cells.
The CODcr is above 10,000, and the water quality is alkaline, which is highly suitable for anaerobic fermentation! ! !
It is necessary to check whether it is an antibiotic manufacturer; if so, use anaerobic agents with caution, as they are prone to failure due to external influences. Hydrolysis will do; there is practical experience available.
Can these things be used as raw materials for feed production? For wastewater treatment, anaerobic processes can still be used, but the parameter requirements are very strict. If UASB is used, the flow rate, flow volume, and the design of the three-phase separator must all be set on a more conservative scale.
Thank you! Currently, I’m using a UASB + aerobic system, but there’s still a layer of those damned floating dead bacteria on the surface of the secondary sedimentation tank. (There are no dead bacteria in the water coming out of the UASB), so the concentration of that substance in the effluent remains around 500PPM, and the ammonia nitrogen level is also very high. Is it because my residence time in the UASB is too short? (About 30 hours)
It is present on the surface of the secondary sedimentation tank. Could it be that poor sludge discharge from this tank has led to anaerobic mixing of the sludge, resulting in the formation of dead bacterial cells on its surface? Check the sludge discharge condition of the secondary sedimentation tank.
It’s not due to sludge discharge. It’s the dead bacterial cells that have autolyzed, causing the water quality to become viscous. In the aerobic tank, air is introduced and it results in a lot of foam; (the waste microbial cells produced by us are aerobic bacteria), and then it is sent to the secondary sedimentation tank. It’s difficult! ! ! I seek advice from experts! ! ! This post was last edited by ntdbm on 2009-4-16 17:21]
The inorganic ceramic membrane process can be tried
It is related to investment. 1) Activated carbon post-treatment 2) Membrane separation
I think MBR membranes can be used for this purpose; I’ve only been involved in the treatment of landfill leachate, which is done using MBR membranes. I’ve never had any contact with the pharmaceutical industry!
Application 3: Use of ceramic membranes in the filtration of ZSM—5 molecular sieves for wastewater reuse. Ceramic membranes are employed in the wastewater reuse process involving ZSM—5 molecular sieves, allowing for the recovery of these molecular sieves. Thanks to their high separation precision, the wastewater after molecular sieve recovery can be fully reused, which saves raw materials. It also increases the yield of the product by 3 percentage points, reduces production costs, and simplifies the operation process compared to before.
It is possible to try using BAF to remove dead bacteria before the wastewater enters biochemical treatment.
I think bacterial corpses are organic substances with relatively large particle sizes; removing them through methods such as biochemical hydrolysis is not as effective as filtration. Moreover, your biofilm method only serves to retain certain substances, and over time problems such as blockages still occur.
I analyze that such water should be the effluent after anaerobic treatment, similar to molasses alcohol wastewater. In the composition of these COD, anaerobic bacteria account for a low proportion; they are mainly composed of large molecular organic substances, such as cyclic organic compounds like phenols. Personally, I believe degradation should be enhanced through anaerobic pretreatment, using methods such as acidification, oxidation, and catalytic oxidation. Secondary oxidation or re-mixing is carried out after the anaerobic reaction to achieve maximum degradation. Finally, aerobic treatment and constructed wetlands and other technologies are used for the final treatment. It’s just my personal opinion; I hope experts can give some guidance!
This post was last edited by shanyee on 2009-5-7 at 19:16. After anaerobic treatment, aerobic treatment is carried out, and disinfection is necessary in the end.
If it is mycelium, plate and frame filtration can be used to remove the mycelium, after which the wastewater is sent for anaerobic treatment
It’s a bit unfamiliar to me, but my previous employer specialized in the production of inorganic ceramic membranes, which were often used by the pharmaceutical industry for such processing tasks. In simple terms, a ceramic membrane is a type of physical filter; it’s designed to handle nanoparticles with sizes ranging from 10nm to 500nm. It can be used for solid-liquid separation as well as liquid-liquid separation. Whether it will work in all cases remains uncertain
Biochemical treatment generally makes use of microorganisms, which each have their own optimal growth conditions. When treating wastewater with high concentrations, it is necessary to first adjust the conditions – by setting the appropriate concentration, temperature, and pH level – before feeding the wastewater into the environmental treatment system
In my opinion, the high COD level is caused by bacteria; if bacteria are removed first through flocculation and sedimentation, the COD level should be low
In my opinion, pretreatment must be carried out before entering the anaerobic environment