Wastewater biological treatment method of polybasic carboxylic acid residue
A polycarboxylic acid, biological treatment technology, applied in waste treatment, multi-stage water treatment, biological sludge treatment, etc., can solve the problems of labor-intensive pH value control, purchase a large amount, etc., to reduce operating costs and treatment costs. , the effect of reducing waste
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Embodiment 1-1
[0073] Get 1000g of pure terephthalic acid process thin film evaporation tank feed (volume is 450mL, solid content is about 260g, contains cobalt ion 0.4wt%, manganese ion 0.5wt%, bromide ion 2.5wt%, sodium ion 0.3wt%) , put it into a 200°C oven to evaporate most of the water and acetic acid to a volume of 300mL; then quickly pour it into 3000g of ice-pure water, stir evenly and let it stand for 10min; filter the obtained suspension Wash with 350g of pure water to remove water, cobalt ions and manganese ions on the crystallization surface to obtain a filter cake (375g in weight). After the filter cake was dried at 60° C. for 12 hours, its weight was measured to be 175 g. It is calculated that the water content in the filter cake is 53wt%, and the recovery rate of the solid content is 67%. That is to say, the method of the present invention can separate more than 60 wt% of polycarboxylic acid solids in the residue, and can indeed effectively reduce the biochemical oxygen deman...
Embodiment 1-2
[0075] According to the same feed composition as in Example 1-1, take 1000 g of feed from the thin film evaporation tank of the purified terephthalic acid process, and send it into an oven at 200 ° C to evaporate most of the water and acetic acid to a volume of 300 mL; Then quickly pour it into 2700g of pure water and stir evenly, place it in a constant temperature tank at 75°C overnight; filter the obtained suspension with 100g of pure water to remove water, cobalt ions and manganese ions on the crystal surface , Obtain the first filter cake (weight is 200g) and the first filtrate. After drying the first filter cake at 60° C. for 12 hours, its weight was measured to be 92 g. It is calculated that the water content in the first filter cake is 54 wt%, and the recovery rate of solid content is 35%. The first filtrate was placed in a 35°C constant temperature bath overnight; the resulting suspension was subjected to suction filtration and washed with 100 g of pure water to remov...
Embodiment 1-3
[0081] According to the same feed composition as in Example 1-1, take 1000 g of feed from the thin film evaporation tank of the purified terephthalic acid process, and send it into an oven at 200 ° C to evaporate most of the water and acetic acid to a volume of 300 mL; Then quickly pour it into 2700g of pure water and stir evenly, and place it in a constant temperature tank at 95°C overnight; filter the obtained suspension with 120g of pure water to remove water, cobalt ions and manganese ions on the crystal surface , Obtain the first filter cake (weight is 125g) and the first filtrate. After drying the first filter cake at 60° C. for 12 hours, its weight was measured to be 56 g. It is calculated that the water content in the first filter cake is 55 wt%, and the recovery rate of solid content is 22%. The first filtrate was placed in a 30°C constant temperature bath overnight; the resulting suspension was subjected to suction filtration and washed with 250g of pure water to re...
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