What is MLSS and MLVSS | Sanjeet Rawat |  

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These values are somewhat related but not directly linked. MLSS is a measure of the amount of solids in the tank. The SV30 is a measure of the volume to which those particular solids will settle in 30 mins. If you were able to maintain a fairly constant MLSS value over a long period of time, the SV30 value would tell you if settle-ability was improving or worsening.

To determine the appropriate capacity of a clarifier for an anaerobic digester with a capacity of 800KLD (kiloliters per day), several factors need to be considered. The capacity of the clarifier should be designed to effectively handle the flow rate and solids content of the effluent from the anaerobic digester, ensuring efficient separation and settling of solids. The clarifier is an essential component in wastewater treatment systems, responsible for the separation of suspended solids from liquid effluent. It works by allowing the heavier solids to settle at the bottom while the clarified liquid is discharged from the top. The size and capacity of the clarifier are crucial to achieve optimal performance and meet the desired effluent quality standards. Several factors influence the determination of clarifier capacity: 1. Flow Rate: The flow rate of the effluent from the anaerobic digester is a primary consideration in sizing the clarifier. It is important to ensure that the clarifier can handle the maximum flow rate without causing hydraulic overloading or compromising its settling efficiency. The flow rate is typically measured in liters per day (L/day) or kiloliters per day (KLD). 2. Solids Content: The solids content in the effluent also plays a significant role in determining clarifier capacity. Anaerobic digesters produce sludge, which contains both organic and inorganic solids. The concentration of these solids affects settling characteristics and determines how much space is required for effective separation. 3. Retention Time: The retention time refers to the duration that wastewater remains in the clarifier, allowing sufficient settling time for solids to separate from liquid. Retention time is influenced by factors such as flow rate, influent characteristics, and desired effluent quality standards. 4. Design Criteria: Various design criteria, such as overflow rates, surface loading rates, and sludge loading rates, are considered when sizing a clarifier. These criteria ensure that the clarifier operates within its design limits and achieves the desired performance. 5. Effluent Quality Standards: The required effluent quality standards, as mandated by local regulations or project specifications, also influence the clarifier capacity. Stricter effluent quality standards may require larger clarifiers to achieve the desired level of solids removal. Considering these factors, it is challenging to provide an exact capacity for the clarifier without more specific information about the influent characteristics, desired effluent quality standards, and other design parameters. However, a general rule of thumb is to size the clarifier based on a hydraulic retention time (HRT) of 2-4 hours. This means that the total volume of the clarifier should be able to accommodate 2-4 times the average flow rate over that period. For example, if the average flow rate from the anaerobic digester is 800KLD, and a hydraulic retention time of 4 hours is desired, then the total volume of the clarifier should be approximately 3200 kiloliters (800KLD * 4 hours). It is important to note that this calculation provides a rough estimate and should be further refined based on site-specific conditions, influent characteristics, and project requirements. Consulting with wastewater treatment experts or engineers experienced in anaerobic digestion systems would be advisable to determine the most accurate capacity for the clarifier.

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1.5 to 3ppm

Dear Sir, I respect your work experience in the field of wastewater management. I don't have that much experience, but the videos I make on the channel are based on the experience of people who have great experience in this field. I do research on any subject and conclude the results, and make videos on those conclusions. This topic is also a result of that conclusion. If you watch the video, I have mentioned that The MLSS will vary based on the sludge age, nature of wastewater (BOD, COD value), incoming solids, ambient conditions, and the size of the aeration tank. The value I have mentioned in the video is a desirable range of MLSS and MLVSS.

@@ETPKnowledgeJunction you are very much right

1:1 ratio pr aapke effluent kisi quality achi nahi aayegi..

@@ETPKnowledgeJunction An interviewer asked me, is this explained in any video?

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When activated sludge becomes lighter and starts floating on the surface, it indicates a potential issue with the wastewater treatment process. Here are some steps to address this problem: 1. Identify the cause: Determine the underlying cause of the activated sludge floating on the surface. Several factors can contribute to this issue, including excessive growth of filamentous bacteria, poor settling characteristics of the sludge, or changes in the wastewater composition. 2. Evaluate operational parameters: Review and assess various operational parameters of the wastewater treatment plant. This includes examining the influent characteristics, such as organic loading, nutrient levels, and pH. Additionally, evaluate the aeration system, sludge age, and hydraulic retention time to identify any deviations from optimal conditions. 3. Adjust aeration and mixing: Proper aeration and mixing are crucial for maintaining a healthy activated sludge process. If floating sludge is observed, consider adjusting the aeration rate and pattern to ensure adequate oxygen supply while preventing excessive turbulence. Optimal mixing can help prevent filamentous bacteria from proliferating and promote settling of sludge. 4. Control filamentous bacteria: Filamentous bacteria are often responsible for poor settling characteristics and floating sludge. Implement strategies to control their growth, such as reducing hydraulic or organic loading rates, optimizing nutrient dosing (e.g., phosphorus), or using specific chemicals or biological products designed to inhibit filamentous bacteria. 5. Monitor and adjust solids retention time (SRT): The SRT is an important parameter that affects the overall performance of activated sludge systems. Adjusting the SRT by wasting excess sludge or increasing biomass retention can help improve settling characteristics and reduce floating sludge issues. 6. Consider chemical addition: In some cases, adding chemicals can aid in resolving floating sludge problems. Chemicals like coagulants or flocculants may enhance floc formation and settling properties of the sludge. However, careful consideration should be given to the potential impact on downstream processes and effluent quality. 7. Perform microscopic examination: Microscopic analysis of the activated sludge can provide valuable insights into the microbial composition and identify specific filamentous bacteria causing the floating sludge issue. This information can guide targeted interventions for controlling filamentous growth. 8. Optimize sludge wasting: Proper management of sludge wasting is essential to maintain a healthy sludge blanket and prevent excessive accumulation of solids. Regularly monitor and adjust the wasting rate based on settled sludge volume, biomass concentration, and observed settling characteristics. 9. Consider process modifications: If the floating sludge issue persists despite adjustments, it may be necessary to consider process modifications or upgrades. This could involve changes in aeration system design, installation of additional clarifiers, or implementation of advanced treatment technologies like membrane bioreactors (MBRs). 10. Regular monitoring and maintenance: Continuous monitoring of operational parameters, effluent quality, and sludge characteristics is crucial for early detection of any issues related to floating sludge. Regular maintenance activities such as cleaning of aeration equipment, clarifiers, and other process components should also be performed to ensure optimal performance. It is important to note that the specific actions required to address floating sludge may vary depending on the unique characteristics of each wastewater treatment plant. Consulting with wastewater treatment experts or specialists can provide tailored solutions for resolving this issue effectively.

Ok

Bacteria ki quantity badhani hogi... watch video " bacteria and wastewater " is video me bataya gya h ki kon kon se factors effect krte hn bacteria ko. Thanks dear stay connected ❤️

Great observation...please watch HOW TO REMOVE AMMONIA FROM WATER video on RU-vid channel etp knowledge junction. Your all concepts will be cleared.

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Paid classes ka koi link nahi h..wo course h

@@ETPKnowledgeJunction ok. then how to I join

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Thanks dost... Jo bhi data aata h wo researchers k aadhar pr aata h. MLSS and MLVSS ka ratio h wo.

Sir agar apne ratio alag rakhe to kya hoga ?

Aur sir ye ratio ka data kaunse factor pe depend karta hai

Wahi jo video me bataya gya h...🤭

Hi sunil, I didn't get your question. Thanks dear stay connected ❤️

Hi sir I mean to say that any criteria is there that minimum &,maximum value of mlss should maintained

Dear as I have explained in video the very lower and very higher limit of MLSS is not good for sludge condition and a value around 3k mg/l is good.

Not possible friend.