A Summary of Executive Results
With a view to promoting the prevention and control of pollution in the river basins of Chiayi County, the Chiayi County Environmental Protection Bureau entrusted GEGA ENGINEERS ＆ TECHNOLOGY CO., LTD. to implement the "2021 Chiayi County Animal Husbandry Inspection and Control and Wastewater Ammonia Nitrogen Recovery Promotion Plan" (hereinafter referred to as the “Plan”) which aimed to strengthen monitoring and management, guide the resource utilization of animal husbandry wastewater, and strive to improve water pollution and other work for the animal husbandry within the jurisdiction. The implementation period of this plan was from January 1, 2021 to November 30, 2021. The work progress results (statistics from January 1, 2021 to September 30, 2021) are as follows:
1. Pollution source permit management
This project had completed 56 permit review operations and 237 approval operations of regular inspection application review and in the second half of 2020; including water pollution inspection cases, permit documents and reported disciplinary cases with 1,246 computer file creation and maintenance operations had been performed.
2. Inspection and punishment of animal husbandry waste and sewage discharge
A total of 1,106 audits of regulated animal husbandry and 98 non-regulated duck and geese inspections and counseling had been completed, and collected 254 samples of regulated animal husbandry runoff water and 45 samples of non-regulated animal farms. As a result, a total of 47 violations of the “Water Pollution Control Act” were found, 41 cases of them were mainly due to the effluent exceeding the quantity limit; 44 of them had been punished according to the “Water Pollution Control Act”, with the amount of the disposition at NT$ 650,300.
3. Real-time pollution monitoring and investigation operations
11 unidentified pipelines were seized, 10 of which had been closed and removed. Continuous monitoring of water quality was carried out in 32 places including the upstreams of Kangle Bridge, Minxiong Da Pai, and Heping Bridge, and 10 cases of discharge water exceeding the standard and 1 case of bypass discharge were found.
4. Functional evaluation of industrial wastewater treatment facilities
A functional evaluation of initial evaluation, re-evaluation and negotiation to four industries of being selected and approved by the Environmental Protection Bureau had been completed.
5. Promote the recovery of ammonia nitrogen from livestock wastewater
For 10 livestock farms, the effect of biogas residue and biogas slurry irrigation and the benefit of water quality improvement were evaluated; an expert guidance group was established to handle 20 livestock farms that have obtained the approval of "biogas residue and biogas slurry for agricultural land and fertilizer utilization", and provide guidance for reasonable irrigation. Increase in volume and willingness to use.
This year, 13 applications for the use of biogas residue and biogas slurry for agricultural land and fertilizer distribution have been submitted, with an annual application volume of 18,240.36 metric tons.
6. Benefit assessment of biogas slurry and residue irrigators
From 2016 to 2020, a totoal of 86 farmlands in Chiayi County had already applied for the use of biogas residue and biogas slurry and the annual irrigation amount was 195,509.26 metric tons, in which the irrigation crops included rice, pennisetum, corn and sugarcane. It was estimated that BOD reduction would be 1,184.98 metric tons/year, 45.92 metric tons /year of ammonia nitrogen reduction, and 1,777.35 metric tons/year of SS reduction.
For livestock farms that had obtained the approval for the use of biogas slurry and biogas residue fertilizer, inspections were carried out at least every 3 months. According to statistics, an average of 5.6 inspections have been conducted so far, and the total amount of irrigation had been 97,947 metric tons. In animal husbandry irrigation less than 50%, inspections and sampling would be strengthened to increase the amount of irrigation.