The working period of this project is from May 15, 109 to March 31, 110. The work content is mainly divided into four parts: (1) Tracking the field results of irrigating farmland with biogas slurry from livestock farms; (2) Analysis of the actual use effect of livestock biogas slurry and biogas slurry in farmland fertilizers in Yunlin County; (3) Biogas slurry The experiment and evaluation of the impact of liquid biogas residue irrigation on the quality of farmland soil and groundwater; (4) The pollution remediation strategy of Magongcuo in Yunlin County. The content of the contract has been fully completed within the working period. The summary of implementation results is as follows:
Tracking the results of irrigating farmland with biogas residue and liquid from livestock farms: This project completed sampling and analysis of 124 samples of groundwater and 169 samples of soil; tracking the irrigation situation of livestock farms in 4 seasons and patrolling 188 livestock farms. In the 124 samples of groundwater, 89 wells were tested during the wet period, 66 of which had conductivity, accounting for 74.2%, which exceeded the irrigation water standard of 750 µS/cm. Among them, the conductivity value exceeded 1000 µS/cm, reaching 49 wells, which exceeded the standard of 750 µS/cm. 55% ratio. Ammonia nitrogen has 59 wells exceeding the groundwater monitoring standards, accounting for 66.3%. In the dry season, 35 wells were tested, 30 wells with conductivity, accounting for 85.7%, exceeding the irrigation water standard; 29 wells with ammonia nitrogen exceeding the groundwater monitoring standard, accounting for 80.9%. Among the 169 points of soil samples, the copper concentration of most soil samples was below 40 mg/kg, and there were 3 points that exceeded the soil monitoring standard of 120 mg/kg. The zinc concentration of soil samples is mainly distributed between 100 and 200 mg/kg, 7 points exceeding the soil monitoring standard of 260 mg/kg. Soil conductivity The conductivity of most samples is concentrated within 400 μS/cm. Generally, it is recommended that the conductivity of more than 800 μS/cm should stop the application of biogas residue and biogas. There are 2 points where the conductivity value exceeds 800 μS/cm. From January to December 109, the total amount of irrigated farmland fertilizer used by the biogas residues and liquids of the livestock farms was 314,540 metric tons, accounting for about 58% of the total approved amount of 542429.6 metric tons. In 109, 3 fields were not irrigated throughout the year; the irrigation rate of 18 fields was less than 10%; and the irrigation rate of 28 fields exceeded the approved amount.
Analysis of the effectiveness of the actual use of biogas slurry and biogas residue in farmland fertilizers in the livestock industry of Yunlin County: This project has completed the monitoring and evaluation reports of 67 livestock farms. Among them, the soil copper and zinc concentrations reached the monitoring standard or the conductivity exceeded 800 µS/cm, and there were a total of 9 sites. Except for the Linsongteng Livestock Farm, all other livestock farms have only a single irrigated land number and a single item exceeds the stop irrigation standard by a small amount. Comparing the results of soil quality monitoring over the years, most of them have not exceeded the standard in the past. Due to the heterogeneity of the soil, a single point exceeding the standard may be caused by the heterogeneity of the soil. It is recommended to maintain irrigation and continuous monitoring in the future. If there is still an excess of the standard, then evaluate the necessity of stopping irrigation. However, the two samples of land number monitored by Linsongteng Livestock Farm showed that zinc exceeded the soil monitoring standard. It is recommended that Linsongteng Livestock Farm should have an in-depth understanding of the quality of its biogas residue and its irrigating situation, and evaluate its suitable irrigation amount and irrigation method. In terms of the effectiveness of the actual reduction of the fertilizer content of the biogas residue and liquid farmland, the total amount of water recovered in the 109 year was 260,311.98 metric tons and the total reduction of pollutants was 164 kg/day in accordance with the discharge water standard as plant irrigation and reuse; the total reduction of pollutants was 164 kg/day; In terms of use, the actual total application in 109 was 306,383.32 metric tons, and the total reduction in pollutants was 12,923.41 kg/day; in terms of the reuse of agricultural waste cases, the amount of re-use and irrigation in 109 was 4,9383.0 metric tons; the total reduction in pollution was 2139.04 kg/day. day. The total reuse of animal manure and urine in Yunlin County in 109 was 616,078.30 metric tons, and the total pollution reduction was 15,226.45 metric tons; the reduction of BOD was 6058.52 kg/day; the reduction of SS was 8794.37 kg/day; the reduction of ammonia nitrogen was 373.55 kg/day. For the reduction of key water quality monitoring stations, the total reduction of BOD at the Tuku Bridge Station was 763.61 kg/day; SS 1005.75 kg/day; and ammonia nitrogen 45.34 kg/day. The Haifengqiao station reduced BOD 166.048 kg/day; SS 275.596 kg/day; ammonia nitrogen 10.998 kg/day. The reduction of BOD at the Toyohashi station is 580.976 kg/day; the reduction of SS is 684.768 kg/day; the reduction of ammonia nitrogen is 33.226 kg/day.
Test and evaluation of the impact of biogas residue and biogas slurry irrigation on the quality of agricultural soil and groundwater: a total of 5 simple wells were set up; 7 private wells were screened and a total of 12 monitoring wells were monitored with biogas residue and biogas slurry irrigation. After 4 times of biogas residue and biogas slurry irrigation, at least 10 metric tons per irrigation. From the preliminary results of the irrigation test, it can be found that the irrigation of biogas residue and biogas slurry will have a significant impact on the quality of groundwater. In the past, the main focus was on ammonia nitrogen and electrical conductivity. From the experimental results, it is shown that the influence of nitrate nitrogen on groundwater quality after irrigation cannot be ignored. It is speculated that nitrate has high water solubility, is negatively charged, and has low adsorption capacity with soil. Therefore, it reacts very quickly to the quality of groundwater, and its impact should be thoroughly evaluated in the future.
The pollution remediation strategy of Magongcuo in Yunlin County: This project completed the investigation of the source of the dyeing load and the load, the sampling and analysis of the water quality at 5 points and the bottom sludge at 5 points. The water quality RPI value of the 5 points is above 6.0, all of which belong to the serious pollution level. The copper concentration in the bottom mud at the 4 measuring points all exceeded the lower limit of the bottom mud quality of 50.0 mg/kg. Among them, the concentration of copper in the bottom mud of Renyiqiao is 127.2 mg/kg, which has exceeded the soil monitoring standard of 120 mg/kg for edible crop farmland. The zinc concentration in the bottom mud at the four measuring points all exceeded the upper limit of the bottom mud quality of 384 mg/kg. Among them, the zinc concentration of sediment at the Zhenanqiao measuring point was 1133 mg/kg; the zinc concentration of sediment at Renyiqiao was 1778 mg/kg. The zinc concentration of the sediment at two measuring points exceeded 600 mg/kg of the soil control standard for edible crops and farmland. It shows that the quality of the mud from Ma Gongcuo's large discharge may be affected by the discharge of wastewater from the livestock industry. In addition, attention should be paid to the stacking situation of the dredged mud at Ma Gongcuo to avoid random stacking of the mud into the farmland, causing soil pollution on the farmland. Regarding the Ma Gongcuo's pollution remediation strategy, it is suggested that improvements can be made to the following four options, including: (1) increasing the base flow of the large drainage; (2) clearing the coastal silt; (3) inspecting and counseling pollution sources; (4) animal husbandry pollution treatment Technical optimization.
