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Diss Factsheets

Administrative data

Endpoint:
additional ecotoxicological information
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
15 Oct - 3 Dec 1997
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study report does not contain details of testing procedures.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998

Materials and methods

Test guideline
Deviations:
yes
Remarks:
process effluent tested
Principles of method if other than guideline:
Three samples of HMBDA process effluents were tested for aquatic toxicity. Study report does not provide specific testing guidelines or protocols. Purpose of testing was to assess impact to enviroment of discharge of the effluents. Testing was conducted with rainbow trout and activated sludge.
GLP compliance:
not specified

Test material

Constituent 1
Details on test material:
not provided

Results and discussion

Any other information on results incl. tables

Ecotoxicity Results for Rainbow Trout

(% effluent)

 HMBDA Effluent Description Rainbow Trout 24 hr      Microtox 15 min  BOD COD NPOC   pH
   LC50 (%) NOEC (%)   EC50 (%)  mg/L  mg/L  mg/L  
 untreated filtrates  0.35  0.1  0.36  1500  26000  10000  5.95
 filtrates treated with NaOH  0.18  0.1  0.80  1600  21000  8500  8.39
 filtrates treated with HCl and Unit 83 effluent  0.57  0.32  1.0  740  24000  8400

 9.13
               

% Activated Sludge Resipration Inhibition

  HMBDA Effluent Description  % Effluent Concentration              EC10 EC50 
   0.1  0.3  1.0  3.0  10  %  %
   % Inhibition                
 untreated filtrates  39.7 74.5  69.9  75.4  96.3  <0.1  ~0.2 
 filtrates treated with NaOH  39.4 84.6  77.4  84.2  99.9  <0.1  ~0.15 
 filtrates treated with HCl and Unit 83 effluent  16.6 74.6  57.8  83.3  63.3  <0.1  ~0.8 

Discharge Rates Based on Fish Toxicity

  HMBDA Effluent Description Rainbow Trout 24hr LC50   Desirable release rate  Maximum release rate 
   (%)  (Kg/min)  (Kg/min)
 untreated filtrates  0.35  35  350
   filtrates treated with NaOH  0.18  18  180
  filtrates treated with HCl and Unit 83 effluent  0.57  57  570

no discharge rates for protection of sewage treatment plants could be derived since the EC10 activated sludge inhibition was not determined (was below the lowest test concentration).

Applicant's summary and conclusion

Conclusions:
Rainbow trout and activated sludge were used in acute toxicity tests with HMBDA effluents. Maximum effluent release rates were determined that would be not cause adverse effects to the enviroment.
Executive summary:

Rainbow trout and activated sludge were used in acute toxicity tests with HMBDA effluents. Maximum effluent release rates were determined that would be not cause adverse effects to the enviroment.