Results of influent wastewater analysis and comparison with TCVN 5945:2005 column A (output concentration after treatment):<\/p>\n
Parameter Name<\/p>\n
Unit<\/p>\n
Result<\/p>\n
TCVN 5945:2005 column A<\/p>\n
pH<\/p>\n
–<\/p>\n
5.5 – 9<\/p>\n
6 – 9<\/p>\n
Suspended Solids<\/p>\n
mg\/l<\/p>\n
400 – 800<\/p>\n
50<\/p>\n
COD<\/p>\n
mgO\/l<\/p>\n
1,500- 2,500<\/p>\n
50<\/p>\n
BOD<\/p>\n
mgO\/l<\/p>\n
700 \u2013 1,200<\/p>\n
30<\/p>\n
Total Coliforms<\/p>\n
MPN\/100 ml<\/p>\n
0.105 – 0.106<\/p>\n
3,000<\/p>\n
Thus, the requirement for the wastewater treatment system is to achieve a minimum removal efficiency of 90% for suspended solids, and 96-97% for other substances. COD, BOD, and over 99% of harmful microorganisms.<\/p>\n
Treatment Technology: Wastewater treatment process is selected using a 3-stage treatment method to minimize the amount of pollutants.<\/p>\n
Treatment Stage\/<\/p>\n
Treatment Process<\/p>\n
Preliminary<\/p>\n
Waste separation, sand settling, balancing, flotation<\/p>\n
Stage 1<\/p>\n
Anaerobic treatment in UASB tank<\/p>\n
Stage 2<\/p>\n
Aerobic treatment in Aeroten tank<\/p>\n
Stage 3<\/p>\n
Coagulation, sedimentation, filtration, disinfection<\/p>\n
Includes the following steps:<\/p>\n
– Waste filtration using an automatic waste filter<\/p>\n
– Wastewater collection, balancing, and oil and grease separation<\/p>\n
– Stage 1 treatment using anaerobic biological method in UASB tank<\/p>\n
– Stage 2 treatment using aerobic biological method in AEROTEN tank<\/p>\n
– Stage 3 treatment using physicochemical methods: coagulation, sedimentation, filtration, and disinfection.<\/p>\n
The settled sludge is pumped into a sludge storage tank, a sludge digestion tank, and finally discharged into a landfill or used as fertilizer.<\/p>\n
Technological flow diagram: Wastewater \u2192 Trash screen \u2192 Collection tank \u2192 Flotation tank \u2192 Equalization tank \u2192 Anaerobic biological tank with packing material \u2192 Activated sludge biological tank \u2192 Sedimentation tank \u2192 Disinfection tank \u2192 Treated water (TCVN 5945-2005 type A).<\/p>\n
Technological explanation:<\/p>\n
Before entering the collection tank, the wastewater is separated from coarse solids by a trash screen. From the collection tank, the wastewater is collected through a flotation device and then flows into the equalization tank (usually using a flotation method with air separation from the solution: creating a supersaturated solution of air, and when the pressure is reduced, air bubbles will separate from the solution, causing the pollutants to float. Therefore, an air compressor and an open scum collection tank are equipped).<\/p>\n
The equalization tank regulates flow rate and concentration. From the equalization tank, wastewater is continuously pumped into an anaerobic biological tank with contact material, then hydraulically flows into the activated sludge tank. Here, the organic matter in the wastewater is decomposed by aerobic bacteria in a high-density suspended form (activated sludge) under aeration conditions. Next, the wastewater is led through a settling tank before being discharged into the disinfection chamber. The wastewater is disinfected with chlorine, then pressure-filtered before being discharged into the environment.<\/p>\n
The sludge from the settling tank is led into a sludge storage tank. Here, a portion of the sludge is recirculated back to the activated sludge tank. The excess sludge is periodically removed.<\/p>\n
To treat aquaculture wastewater, especially catfish wastewater which contains a lot of blood and fat with high concentrations of pollutants, multiple methods must be applied simultaneously as described above: physicochemical methods (waste separation, fat separation by flotation, sedimentation, disinfection, pressure filtration); Biochemical method (anaerobic principle: biological filter with packing material; aerobic principle: aerated aerotank with activated sludge inoculated with microorganisms).<\/p>\n
The treatment facility includes the following construction and equipment items:<\/p>\n
Collection tank, wastewater pump
\nFlotation tank, air compressor, high-pressure pump, drive motor
\nEqualization tank, pump
\nAnaerobic digestion tank, wastewater pump
\nActivated sludge tank, air blower
\nSettling tank, geared motor
\nSludge storage tank, circulating sludge pump
\nDisinfection tank, dosing pump, chemicals<\/p>\n","protected":false},"excerpt":{"rendered":"
Results of influent wastewater analysis and comparison with TCVN 5945:2005 column A (output concentration after treatment): Parameter Name Unit Result TCVN 5945:2005 column A pH – 5.5 – 9 6 – 9 Suspended Solids mg\/l 400 – 800 50 COD mgO\/l 1,500- 2,500 50 BOD mgO\/l 700 \u2013 1,200 30 Total Coliforms MPN\/100 ml 0.105 […]<\/p>\n","protected":false},"featured_media":1674,"template":"","cong_nghe_category":[58,60],"class_list":["post-2055","cong_nghe","type-cong_nghe","status-publish","has-post-thumbnail","hentry","cong_nghe_category-technology","cong_nghe_category-view-implemented-projects"],"acf":[],"_links":{"self":[{"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/cong_nghe\/2055","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/cong_nghe"}],"about":[{"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/types\/cong_nghe"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/media\/1674"}],"wp:attachment":[{"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/media?parent=2055"}],"wp:term":[{"taxonomy":"cong_nghe_category","embeddable":true,"href":"https:\/\/gr-indtech.com\/en\/wp-json\/wp\/v2\/cong_nghe_category?post=2055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}