The EIA completion report (legal name: Report on results of environmental protection works) is made in accordance with Decree 40/2019/ND-CP and Circular 25/2019/TT-BTNMT to meet the requirements:

• Legalize the transition from project implementation to production.
• Having a plan to protect the environment, solutions to treat waste generated during production.
• To complete the legal procedures after the environmental impact assessment report has been made.

Sludge from the wastewater treatment system as prescribed in Appendix C of Circular 36/20215/TT-BTNMT dated June 30, 2015 is:

• Waste sludge with a waste threshold of 2 stars (**): The waste source owner must contract with a functional unit to collect and treat the above sludge in accordance with regulations on hazardous waste management;
• Waste sludge with a waste threshold of 1 star (*): When it is not proven that it is not a hazardous waste, it must be managed according to hazardous waste regulations. If you want to manage according to regulations of normal industrial waste, you must take samples to prove that it is not hazardous waste according to QCVN 50: 2013/BTNMT.

According to Article 15 of Decree No. 201/2013/ND-CP dated November 27, 2013, water resource permits include: underground water exploration license; license to exploit and use surface water; permits for exploitation and use of underground water; license to exploit and use sea water; permits to discharge wastewater into water sources.

According to Circular 25/2019/TT-BTNMT dated December 31, 2019, the report on environmental protection will integrate the types of annual periodic reports of the Enterprise, including: Environmental quality monitoring report/ Report on results of environmental quality monitoring, Report on hazardous waste management, Report on management of domestic waste & common industrial solid waste,… Download here

According to Clause 5, Article 36 of the Law on Water Resources 2021, a number of cases are exempted from applying for a license to discharge waste that can be discharged directly into the water source, including: discharge on a small scale (small) and special especially not contain harmful chemicals, radioactive substances. Specifically, in the cases specified in Clause 3, Article 16 of Decree No. 201/2013/ND-CP dated November 27, 2013, in addition to the above cases, a permit to discharge wastewater into water sources is required.

Report on results of implementation of environmental protection works is a type of document that project owners, production and business establishments that have been approved for EIA make before the project goes into operation. Pursuant to Appendix II of Decree 40/2019/ND-CP, the objects specified in column (4) in the Appendix must make a report on completion of environmental protection works according to regulations.

Production, business and service establishments engaged in hazardous waste generation activities must register hazardous waste source owners’ books, except for the following cases:

• Hazardous waste generators have been operating for no more than 1 year;
• Establishments generating hazardous wastes regularly or periodically annually with a total quantity of ≤ 600kg/year, except for hazardous wastes on the list of persistent organic pollutants (POPs) as prescribed in the Stockholm Convention on persistent organic pollutants;
• Offshore oil and gas facilities.

For the above subjects, the registration shall be replaced with the first-time hazardous waste management report as prescribed in Clause 3, Article 12 of Circular 36/2015/TT-BTNMT.

Preliminary environmental impact assessment is the consideration and identification of the main environmental issues of an investment project during the pre-feasibility study or the stage of proposing the implementation of an investment project.

Subjects to perform preliminary environmental impact assessment are investment projects subject to EIA (specified in Appendix II, Section I, Appendix issued together with Decree No. 40/2019/ND- CP day). And the report complies with Decree No. 54/2021/ND-CP dated May 21, 2021 on preliminary environmental impact assessment.

Step 1: Collect project information and documents related to the test operation plan.

Step 2: Make and send the plan for trial operation of waste treatment works (send to the specialized environmental protection agency of the province where the project is implemented and the agency approving the EIA).

Step 3: The specialized environmental protection agency of the province where the project is implemented conducts an actual inspection of the project.

Step 4: The specialized environmental protection agency of the province where the project is implemented issues a written approval.

Step 5: Conduct test operation.

Step 1: Collect information and project documents related to water resource permits.

Step 2:  Make and submit the application for a license to the competent authority.

Step 3:  The competent authority checks the completeness and validity of the application file for a license.

Step 4:  Organize the appraisal of the dossier and decide on the licensing.

Step 5:  Project owners, production and business establishments receive the License, and comply with the license term.

The process is similar to applying for a new water resource permit. However, the appraisal time will be shorter, and the application for adjustment or extension must report the current status of exploitation and use of water and the implementation of the permit in advance. Applying for new

According to Article 21 of Decree 201/2013/ND-CP dated November 27, 2013, the wastewater discharge permit has a maximum term of 10 years, a minimum of 3 years and is considered for renewal many times.

• The licensing agency determines the specific duration of the permit based on the condition of each water source, the level of detail of information, data of investigation and assessment of water resources and the application file for granting or renewing the permit. of organizations and individuals.
• Businesses must meet certain conditions to be allowed to renew their license.

Pursuant to the provisions of Clause 9 Article 1 of Decree No. 40/2019/ND-CP dated May 13, 2019, the trial operation time of the waste treatment works is from 3 to 6 months from the time of commencement of operation. experiment. Accordingly, the evaluation time in the stage of adjusting the performance of each stage and the efficiency of the wastewater treatment plant (the minimum frequency of wastewater monitoring is every 15 days) is divided into the following cases:

• In case of trial operation for about 3 months, the evaluation time is at least 75 days.
• In case of trial operation for about 6 months, the evaluation time is 150 days.

Environmental protection report is an annual report that an enterprise must make to report to the management agency on the overall environmental protection work at the establishment (specifically, the reporting period is from the date of this report). January 1 to the end of December 31 and reports are sent to the management agencies before January 31 of the following year, except for the cases of reporting at the request of the agency). The first report is sent before January 31 of the year.

Be proactive in the supply of clean and safe water that has been treated: self-sufficiency will help businesses take full initiative in the use and control of clean water quality.

Cost savings: Make good use of waste sources, do not spend a lot of money on buying clean water.

Reduce waste: Renewable energy saves energy and costs.

Creating environmental benefits: helping businesses create a circular, closed process, limiting emissions affecting the environment.

At seafood processing plants, residual by-products in wastewater account for 5-10% of total processing output. Flow by-products entering the wastewater treatment system will increase system operating costs, unstable water quality after treatment, etc.

In fact, this source of by-products can be used as animal feed, pharmaceuticals or raw materials for the production of other by-products. Consult the solution

Eutrophication is a natural environmental phenomenon when ponds and lakes have an excess of nitrogen and phosphorus nutrients. This phenomenon is not new and it is easy to see the phenomenon in places where the water surface is dark green of algae. They greatly affect the life of humans as well as aquatic species.

Currently, there are several ways to help deal with this phenomenon. However, most of the methods still have some limitations, and there is a highly effective network solution if overcome from the beginning, which is the use of probiotics. Consult the solution

Nutrients in wastewater include N and P. In which: Nitrogen content in input wastewater is considered sufficient if total Nitrogen (including Nitrogen – Kjedalhl, Nitrogen – Ammonium, Nitrogen – Nitrite, Nitrogen – Nitrate) in treated water is 1-2mg/l. If it is higher, it means that the nitrogen content in the wastewater is already in excess, it is necessary to stop adding nitrogen from the outside (if any).

Oxygen is of course the most important element in the activated biomass process. If the oxygen supply is cut off or limited, the biomass will become dark, give off an unpleasant odor and the quality of the treated water will be degraded.

It is necessary to reduce the inflow of wastewater immediately or stop it altogether (if the aerator fails completely).

After long periods of insufficient oxygen, the biomass must be vigorously aerated without loading with fresh wastewater. Then the wastewater supply flow can be increased step by step.

Note:   Oxygen problems need to be thoroughly resolved as soon as possible.

BOD after treatment is still high
This condition occurs due to overload, lack of oxygen, pH change, poisoning, poor mixing.
N after treatment is still high
Due to unstable technology, the presence of N compounds that are difficult to decompose, high sludge biomass in the tank, poisoning, and dead bacteria.
N-NO3, N-NO2 after treatment is still high
It is due to inappropriate pH (<6.5 or > 8.5), high N load, presence of toxic substances, unstable operation, low temperature, excess oxygen (anaerobic tank), lack of organic matter. P: required ortho phosphate: 1-2 mg/l, deficiency must be supplemented.

It is necessary to check the pump to see if the water is being pushed up. When the pump works but does not pump water, it is necessary to check the water for the following reasons:

• Is the power supply power stable?.
• Is the pump impeller stuck in any obstacle?
• If there is a strange sound while pumping, it is necessary to stop pumping immediately and find out the cause to fix the problem.

Depending on each specific case, provide a timely pump repair plan. It is best to equip 2 pumps, both for backup use in case the main pump fails, and to pump in combination with the main pump in case it needs to pump with a larger flow.

Floating biomass: Checking organic loads, inhibitors

Scattered biomass: Change of organic load, DO. Check for toxins for organic pretreatment or reduction.

Biomass forms a solid mixture: Increases internal load, oxygen, stabilizes appropriate pH, adds nutrients.

There are many reasons for the biological wastewater treatment system to stop working, which will cause the organism population to starve, lack appetite, and decompose intracellularly. Dead biomass drifts out, increasing the amount of suspended solids in the water. Oxygen is still required to avoid anaerobic conditions and odor problems, but must be kept to a minimum.

How to solve the problem

• Reduce input wastewater from 20-30% of normal level.
• Try to store as much wastewater as possible in the conditioning tank or storage tank.
• Reduce oxygen supply to the lowest possible level (DO about 1-2mg/l).
• Maintain normal operation for as long as possible. Maintain and supplement nutrients.
• If necessary, it is necessary to add carbon sources from outside (such as acetate, methanole…) to prevent biomass from rotting and remove as much as possible.