A food processing wastewater treatment project that lasted several months
This was a food processing wastewater treatment project that spanned several months, from consultation, visits, process determination, engineering construction, debugging, etc., which This is also a situation we often encounter. An auxiliary project ( industrial wastewater treatment ) is actually built following the enterprise. It is necessary to treat the industrial wastewater generated by the enterprise's production process, discharge it to meet standards, or otherwise.
industrial plant, pictures from the Internet
This project is due to the relocation of the food processing plant to a new address and expansion of scale. It requires a new sewage treatment station, and we are responsible for the design, construction, and commissioning of the entire sewage treatment station. Its wastewater volume can reach 500m3/d, and a large enough pool needs to be built to accommodate it. There are also factors affecting other pollutants, which we need to carefully consider.
For example: a large amount of animal and vegetable oils, a large amount of suspended matter, chloride ion high concentration, etc.
Then, in our design and treatment process, pretreatment is particularly important for this food processing wastewater. Factors that affect biochemical treatment, these three will affect it, and it needs to be processed accordingly at the front end - interception, oil separation, Air flotation and so on.
In fact, what processing technology will we use? If you like it, you can like, follow and collect it.
Food processing wastewater is very suitable for biochemical treatment, and we also use biochemical treatment as its leading treatment process. The pretreatment is divided into grease traps, mechanical grilles , coagulation air flotation tanks, etc. The purpose is to eliminate the influencing factors mentioned above, which is more conducive to subsequent biochemical treatment.
The principle of the coagulation air flotation tank is: under alkaline conditions, chemicals are added to aggregate the suspended solids and colloids in the wastewater, and the tiny bubbles generated by air flotation are used to bring them to the water surface, and then the slag scraper is used to remove them. The scum is removed and the collected scum is discharged to the sludge tank.
Biochemical treatment is a biological contact oxidation method, which is divided into anoxic pool and aerobic pool. Their function is not only to treat organic matter, but also to remove ammonia nitrogen and total nitrogen, so that ammonia nitrogen, total nitrogen, organic matter and other indicators can reach the prescribed emission limits.
The principle of the A/O method is: Pool A is an anoxic pool, using the existing aeration system to open to the micro-aeration state, and convert the nitrated nitrogen in the refluxing nitrification solution into nitrogen through denitrification way to remove. The food processing wastewater then enters the subsequent O pool. The O pool is an activated sludge process mode, which oxygenates and aerates the food processing wastewater. If it runs well, it has strong impact load resistance, and most of the organic matter in the slaughtering wastewater can be removed. Ammonia nitrogen was successfully converted.
