Livestock wastewater: From a "hot potato" to a "green treasure," this transformation Revolution concerns everyone

"I used to dread rainy days because sewage would flood everywhere. Now, this water can be used to raise fish, irrigate the land, and even earn money."

"Money!" A fish farmer exclaimed, looking at the clear water outlet.

This is not just a scene, but a real transformation taking place in China's vast rural areas. For a long time...

Livestock wastewater is like a Damocles' sword hanging over the industry. Data shows that untreated livestock manure...

Sewage and wastewater contain large amounts of nitrogen and phosphorus. If discharged directly into rivers, it will lead to eutrophication, algal blooms, and other problems.

This can lead to algal blooms; at the same time, organic pollutants rapidly deplete dissolved oxygen in the water, causing the water to become black and smelly, and breeding mosquitoes.

Flies can even cause zoonotic diseases.

With increasingly stringent environmental regulations, the traditional "anaerobic + aerobic" treatment process, while mature, faces challenges related to "high energy consumption."

The dilemma of "high consumption, high cost, and no profit"—is environmental protection destined to be a losing proposition?

Turning waste into treasure: A green revolution of "biological relay"

The answer is clearly no. Clever practitioners and scientists are using a sophisticated "biological interface" system...

"Power" has transformed the wastewater outlet into a "protein reservoir".

In Yunfu, Guangdong, a revolution concerning "water" is quietly taking place. Wens Foodstuff Group, in conjunction with South China Agricultural University,

A technology called "bacteria-algae-duckweed" co-production has been implemented and included in the Ministry of Agriculture and Rural Affairs' "14th Five-Year Plan".

National key research and development plan.

This isn't science fiction; it's a real, powerful combination of moves.

First step: Microorganisms (anaerobic bacteria pretreatment). Aquaculture wastewater enters the anaerobic tank, where complex anaerobic microorganisms...

The decomposition of organic matter to produce biogas energy is the first step in energy conversion.

The second step: algae (deep purification with microalgae). Highly tolerant microalgae, after being domesticated, rapidly multiply in the racetrack pool.

It absorbs ammonia nitrogen and total phosphorus from water like a "super sponge." In just 7 days, the ammonia nitrogen concentration can be reduced from...

Reduce from 500-600 mg/L to 50-80 mg/L.

The third step: Duckweed (duckweed disposal and resource utilization). Water treated with microalgae enters the duckweed pond, where the duckweed...

It can absorb residual nitrogen and phosphorus and convert them into high-protein feed ingredients with a crude protein content of up to 25%-31%.

The benefits are enticing: this system treats only 5-6 yuan per ton of water, a reduction of approximately [amount missing] compared to traditional methods.

40%; meanwhile, the dry matter from the algae produced can replace part of the soybean meal, effectively reducing feed costs. More importantly...

Yes, for every ton of microalgae and duckweed produced, 1.8 tons and 1.2 tons of carbon dioxide can be fixed respectively, with an annual carbon sequestration of [missing information].

This is equivalent to planting 18,000 trees. Pollution control becomes production, and environmental protection becomes a benefit—this is becoming a reality at this moment.

Beyond livestock and poultry: Aquatic wastewater also holds great potential.

Beyond livestock and poultry farming, cutting-edge technologies are also emerging in the treatment of wastewater from aquaculture. These technologies are particularly relevant for large, contiguous ponds.

Along with factory-style aquaculture, Guangdong Province is vigorously promoting the "one pond, one island" model. This model utilizes highly efficient fixed biological beds (CAF).

Combined with a sulfur-autotrophic denitrification deep nitrogen removal filter (MAD), it removes COD as efficiently as a "precision scalpel".

The treated effluent, containing both total nitrogen and other pollutants, consistently meets the first-class discharge standard for freshwater aquaculture in Guangdong Province, with operating costs of only approximately [amount missing].

160 yuan/mu/year.

In Nanjing, Jiangsu Province, AI technology is empowering a green and circular fisheries industry. This is being achieved through satellites, drones, and ground-based technologies.

Sensors monitor the process, and algorithms calculate the results to achieve 100% efficiency in the "aquaculture-drainage-purification-reuse" process.

Recycling allows for the maximization of water resource utilization.

Policy safeguards: red lines must not be crossed, the future is promising.

Behind all these changes lies the strong guidance of national policy. The state has clearly stated its commitment to "promoting governance through application and leveraging advantages."

The principle of "prioritizing" guides local authorities to implement different standards based on the destination of emissions, and encourages the resource utilization of sewage. Meanwhile,

The latest notice also emphasizes the need to strictly prevent pollution from livestock and poultry farming wastewater and ensure the safety of agricultural irrigation water. According to the "Livestock..."

According to the "Regulations on Pollution Prevention and Control of Large-Scale Poultry Farming", environmental impact assessments must be conducted for newly built, renovated, or expanded poultry farms.

Wastewater treatment in aquaculture is no longer a burden to pass inspections, but rather a crucial aspect of the transformation and upgrading of the aquaculture industry.

It is now the "golden key" to green, low-carbon, and circular development. It transforms environmental burden into economic benefits and reduces pollution load.

Transforming into protein resources. For every practitioner, embracing this transformation is not only about adhering to ethical boundaries...

Seeking solutions is a crucial step in reducing costs, increasing efficiency, and securing a better future.