Hand in hand teaching you how to handle sewage plant sludge inoculation! The detailed steps have arrived
hello everyone! Today, let's talk about the inoculation of sludge from sewage plants! Sludge inoculation is like giving a "blood transfusion" to a sewage treatment plant, whether it is well received or not directly affects the effectiveness of sewage treatment. Many friends feel overwhelmed when it comes to sludge inoculation, don't panic! This article teaches you step by step, from preparation to training, every detail is explained clearly!
1, Preparation before vaccination
(1) Find a reliable sludge 'supplier'
The first step in sludge inoculation is to find "good seeds" for the sewage treatment plant - suitable inoculation sludge. It's like buying things, we have to choose good quality! We prioritize sewage treatment plants that operate stably, have good treatment effects, and treat wastewater with similar water quality to our plant. For example, if our factory mainly deals with domestic sewage, then do not seek sludge from industrial wastewater treatment plants, otherwise microorganisms may not adapt to the environment.
After finding the target sewage treatment plant, we need to communicate in advance to ensure that their surplus sludge can be used for us. And, try to choose ones that are close to our factory as much as possible, so that the transportation time is short, the microorganisms in the sludge can be less affected, and the activity can be better maintained.
(2) Calculate how much mud should be collected clearly
Sludge is not collected casually. If it is collected too much, it will be wasteful, and if it is collected too little, it will not achieve the desired effect. Generally speaking, the amount of inoculated sludge is 5% -10% of the effective volume of the aeration tank. How do we calculate it specifically? It's simple! For example, the effective volume of our aeration tank is 1000 cubic meters. If we calculate based on a 10% inoculation volume, we need to receive 100 cubic meters of sludge.
If you are unsure, you can also consult an experienced master or refer to the vaccination dosage of similar sewage treatment plants, and make adjustments based on the actual situation of our factory.
2, Start getting vaccinated! Step by step, steady and steady
(1) The 'moving journey' of sludge
The inoculated sludge needs to be transported to our factory, and there are also specific requirements for the transportation process. Generally, sealed tankers are used for transportation, just like moving sludge. When loading, try to pack the sludge evenly, don't pile it up too high on one side and not too much on the other.
If you can't get vaccinated immediately, you have to store the sludge in a low temperature, dark place. Why is that? Because the temperature is too high and the light is too strong, it can affect the activity of microorganisms and even cause them to 'hang up'. However, the storage time should not be too long. It is best to complete the inoculation as soon as possible, otherwise the sludge is prone to spoilage, and it will be a waste of effort at that time.
(2) Please put the sludge into the aeration tank
Everything is ready, start getting vaccinated! Turn on the sludge pump and slowly transfer the sludge into the aeration tank through the pipeline. Don't worry at this time, the flow rate should not be too high, otherwise the sludge will suddenly rush into the aeration tank, which is prone to local accumulation and uneven mixing.
While delivering sludge, the aeration equipment needs to be turned on at the same time. Aeration is like providing oxygen to microorganisms, allowing sludge and water in the aeration tank to mix thoroughly, so that microorganisms can adapt to the new environment faster. It's like when we arrive at a new place, we need to familiarize ourselves with the surrounding environment first.
(3) Adjust parameters for the sewage treatment plant
After inoculating the sludge, it's not enough to adjust the process parameters as soon as possible. The most crucial factors are dissolved oxygen, pH value, and water temperature.
Dissolved oxygen should be controlled at 2-4mg/L. Low dissolved oxygen makes it difficult for microorganisms to breathe, resulting in low efficiency in wastewater treatment; Too high dissolved oxygen can waste energy and may also spoil some microorganisms. The pH value should be maintained between 6.5-8.5, which is the most suitable range for microbial growth. The water temperature should be maintained at 15-35 ℃ as much as possible. If it is too cold or too hot, microorganisms may not be willing to work.
When adjusting parameters, don't adjust them too aggressively all at once, take it slow, observe while adjusting, and find the most suitable value.
3, Careful care after vaccination
(1) Add food to microorganisms
After vaccination, the microorganisms have arrived in a new environment and need to be "nourished", otherwise they won't have the energy to work! The main nutrients are nitrogen and phosphorus. Generally, according to C: N:P = 100: 5: Add a proportion of 1.
For example, if the carbon content (calculated as COD) in our sewage is 500mg/L, according to the ratio, we need to add 25mg/L of nitrogen and 5mg/L of phosphorus. The specific amount to be added can be calculated based on the results of water quality testing. Nutrients can be added through specialized dosing equipment, and should be added evenly to ensure that microorganisms can "eat" them.
(2) Daily monitoring of water quality and sludge
From the beginning of vaccination, it is necessary to monitor the water quality and sludge situation every day, just like taking care of a baby, constantly monitoring its changes.
In terms of water quality, the main indicators measured are chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (SS), and ammonia nitrogen. If these values slowly decrease, it indicates that microorganisms have started to "work" and treat sewage; If it doesn't decrease but instead increases, you need to quickly find the reason, whether it's due to improper process parameters or microbial adaptation.
The performance of sludge should also be given special attention, such as sludge volume index (SVI) and sludge settling ratio (SV30). SVI is too high, indicating that the sludge has expanded and may have poor settling performance; If SV30 is too low, it indicates that the sludge concentration is not sufficient. Once an abnormality is detected, it is necessary to analyze the cause in a timely manner, adjust the process accordingly, and take measures accordingly.
(3) Don't panic when encountering problems, solve them this way
During the process of sludge inoculation and cultivation, various problems are inevitably encountered. For example, if sludge does not settle, it may be due to sludge expansion. It is advisable to reduce the influent load and increase dissolved oxygen appropriately; For example, if the microbial activity is not high and the treatment effect is poor, then check whether the nutrients are sufficient, or whether the water temperature and pH value are inappropriate, and then adjust them accordingly.
If you really can't handle it yourself, don't force yourself! Quickly seek advice from experts or experienced colleagues, and together we can come up with a solution that can always solve the problem.
Alright! That's all for the specific methods and implementation steps of sludge inoculation in sewage treatment plants. As long as you follow these steps step by step, I believe everyone can successfully complete the sludge inoculation and make the sewage treatment plant operate efficiently! If you have any further questions, feel free to communicate anytime!
