Industrial wastewater treatment

Industrial wastewater treatment

Industrial wastewater and emissions thereof into the environment are clearly defined and regulated by Cabinet Regulations No. 34, issued on 22 January 2002 in Riga “Regulations regarding Discharge of Polluting Substances into Water”:Water”:


What is industrial wastewater?

1What is industrial wastewater?

2.3.3. industrial wastewater (wastewaters originating from entrepreneurship or in industrial sites and may not be classified as domestic wastewater nor run-off rain water);

2Is it allowed to discharge wastewater into the environment?

42. Discharge of non-treated industrial wastewater, urban wastewater and sludge into surface waters or into the environment, as well as into the rainwater sewage system is prohibited.
(Cabinet Regulations of 19.02.2013. of version No. 97)

3What to do with industrial wastewater?

43. If industrial wastewater is discharged into a centralised collecting system or to external treatment plants, an operator:

43.1. shall enter into an agreement with the owner or possessor of the centralised collecting system or treatment plants. A contract shall specify:

43.1.1. the contracting parties;

43.1.2. the substances which are intended to be discharged including all particularly priority substances and dangerous substances which were determined in the wastewater or which the operator expects to discharge;

43.1.3. the maximum amount of water and polluting substances which the plant may discharge;

43.1.4. the time period of the agreement;

43.1.5. the consequences in case of infringement of the terms of the contract for both parties;

43.2. shall perform pre-treatment of industrial wastewater ensuring that:

43.2.1. no harm occurs to the health of the personnel working with the centralised collecting system and treatment plants;

43.2.2. a centralised collecting system, treatment plants and technological equipment are not damaged;

43.2.3. the operation of treatment plants is not disturbed;

43.2.4. the discharge from treatment plants would not have an adverse effect on the environment and would not cause non-conformity of the receiving waters with the requirements of this Regulation and other laws and regulations;

43.2.5. the wastewater sludge would be possible to manage in accordance with the requirements of laws and regulations not causing harm to the environment;

43.2.6. the wastewater would conform with the conditions of the agreement referred to in Sub-paragraph 43.1 of this Regulation.

(Amended by Cabinet Regulations of 16.01.2007. No. 59; Cabinet Regulations of 27.07.2010. No. 695; Cabinet Regulations of 19.02.2013. No. 97)

4What to do with industrial water containing biodegradable substances such as food production wastewater?

45. If industrial wastewater, which contains biologically degradable substances and does not contain priority substances or dangerous substances, of the production sectors referred to in  Paragraph 11 of Annex 5 to this Regulation is discharged directly into the surface waters, the following conditions shall be observed:

45.1. appropriate treatment shall be performed for wastewater from the undertakings the pollution caused by which is less than 4000 population equivalents ensuring the conformity of receiving water body with the environmental quality requirements laid down and other conditions laid down in the laws and regulations regarding environmental protection;

45.2. an operator shall apply the threshold values specified in  Tables 1 and 2 of Annex 5 to this Regulation or use the best technical methods, choosing such type for discharge control, for which the most stringent requirements are specified, for the wastewater from the undertakings the pollution caused by which is equal to or higher than 4 000 population equivalents.

(Amended by Cabinet Regulations of 16.01.2007. No. 59; Cabinet Regulations of 27.07.2010. No. 695; Cabinet Regulations of 19.02.2013. No. 97)

5What are the sectors into which the food industry is divided?

IV Industrial Sectors

11. The requirements referred to in Paragraph 45 of this Regulation shall apply to the following industrial sectors:

11.1. milk processing;
11.2. production of fruit and vegetable products;
11.3. production and bottling of non-alcoholic beverages;
11.4. processing of potatoes;
11.5. processing of meat;
11.6. production of beer;
11.7. production of alcohol and alcoholic beverages;
11.8. production of animal feed from products of plant origin;
11.9. production of gelatine and glue from the membranes, skin and bones of animals;
11.10. production of malt;
11.11. fish processing industry.