The value of parameter C for pollution parameters in cassava starch processing wastewater in Vietnam

17:59, 11/07/2024

The Ministry of Natural Resources and Environment of Vietnam issued Circular 31/2017/TT-BTNMT on September 27, 2017 stipulating the value C of the pollution parameters in wastewater from cassava starch processing.

Circular 31 stipulates the value C of pollution parameters in wastewater from cassava starch processing in Vietnam as follows:

No.	Parameter		Unit	Value C
No.					A	B
1	pH		-	6 - 9	5.5 - 9
2	Suspended Solids (TSS)		mg/l	50	100
3	BOD5 (20°C)		mg/l	30	50
4	COD	New facility	mg/l	75	200
4	COD	Operating facility	mg/l	100	250
5	Total Nitrogen (N)	New facility	mg/l	40	60
5	Total Nitrogen (N)	Operating facility	mg/l	50	80
6	Total Cyanide (CN‑)		mg/l	0.07	0.1
7	Total Phosphorus (P)		mg/l	10	20
8	Total Coliform	MPN or CFU/100 ml	MPN or CFU/100 ml	3 000	5 000

Where:

- Column A of Table 1 stipulates the value C of pollution parameters in wastewater from cassava starch processing when discharged into water sources used for domestic water supply;

- Column B of Table 1 stipulates the value C of pollution parameters in wastewater from cassava starch processing when discharged into water sources not used for domestic water supply;

The purpose of the water source receiving the wastewater is determined at the wastewater receiving area.

Simultaneously, Circular 31 also stipulates that from January 01, 2020, the values prescribed for new facilities will apply to all cassava starch processing facilities.

See details in Circular 31/2017/TT-BTNMT effective from December 01, 2017.

- Thao Uyen -

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