GB 14374-1993Discharge standard of water pollutants and analytical methods for space propellant (English PDF)

1.1 Subject content

This standard specifies, according to the destination of the wastewater discharge and by time period, the maximum permitted discharge concentrations of water pollutants from space propellants.

1.2 Scope of application

This standard applies to the management of the discharge of wastewater from propellants used in astronautics, and to the environmental impact assessment, design and completion acceptance of construction projects and to the management of their discharges after completion.

This standard also applies to organisations using hydrazine and amine fuels.

3.1 Discharge destination

The pollutants specified in this standard shall not be discharged into waters other than Class IV and Class V waters of GB 3838 and Class III sea areas of GB 3097.

3.2 Standard values

3.2.1

Construction projects approved before 1 December 1993, and enterprises put into production after their completion, shall comply with Table 1.

Table 1 - Maximum permitted discharge concentrations of pollutants, mg/L: pH value: 6 to 9; biochemical oxygen demand (BOD5): 80; chemical oxygen demand (CODCr): 200; suspended solids: 250; ammonia nitrogen: 40; cyanide: 0.5; formaldehyde: 3.0; anilines: 3.0; hydrazine: 0.1; monomethylhydrazine: 0.2; unsymmetrical dimethylhydrazine: 0.5; triethylamine: 10.0; diethylenetriamine: 10.0.

Note: the standard values are the maximum values of a single monitoring.

3.2.2

Construction projects approved on or after 1 December 1993, and enterprises put into production after their completion, shall comply with Table 2.

Table 2 - Maximum permitted discharge concentrations of pollutants, mg/L: pH value: 6 to 9; biochemical oxygen demand (BOD5): 60; chemical oxygen demand (CODCr): 150; suspended solids: 200; ammonia nitrogen: 25; cyanide: 0.5; formaldehyde: 2.0; anilines: 2.0; hydrazine: 0.1; monomethylhydrazine: 0.2; unsymmetrical dimethylhydrazine: 0.5; triethylamine: 10.0; diethylenetriamine: 10.0.

Note: the standard values are the maximum values of a single monitoring.

4.1 Sampling points

Sampling points for hydrazine, monomethylhydrazine, unsymmetrical dimethylhydrazine, triethylamine and diethylenetriamine shall be set at the outlet of the workshop or of the treatment facility; other pollutants are sampled at the main discharge outlet. Permanent signs shall be set up at the discharge outlets.

4.2 Sampling frequency

The monitoring frequency is determined according to the production cycle. Where the production cycle is 8 h or less, one sample is taken every 2 h; where the production cycle is longer than 8 h, one sample is taken every 4 h.

4.3 Determination methods

The pollutants in this standard shall be determined by the methods given in Table 3.

Table 3 - Determination methods (item: method; method standard number):

1 pH value: glass electrode method; GB 6920.

2 Biochemical oxygen demand (BOD5): dilution and seeding method; GB 7488.

3 Chemical oxygen demand (CODCr): dichromate method; GB 11914.

4 Suspended solids: gravimetric method; GB 11901.

5 Ammonia nitrogen: Nessler's reagent colorimetric method; GB 7479.

6 Cyanide: isonicotinic acid-pyrazolone colorimetric method; GB 7487.

7 Formaldehyde: acetylacetone spectrophotometric method; GB 13197.

8 Anilines: N-(1-naphthyl)ethylenediamine azo spectrophotometric method; GB 11889.

9 Monomethylhydrazine: p-dimethylaminobenzaldehyde spectrophotometric method; GB/T 14375.

10 Unsymmetrical dimethylhydrazine: sodium aminoferrocyanide spectrophotometric method; GB/T 14376.

11 Triethylamine: bromophenol blue spectrophotometric method; GB/T 14377.

12 Diethylenetriamine: salicylaldehyde spectrophotometric method; GB/T 14378.