การวิเคราะห์ลักษณะสมบัติของน้ำเสียที่ปลายท่อระบายน้ำบริเวณ ถนนทิพย์ช้าง ด้านหลัง หจก.แอลพีไฮเทค เซ็นเตอร์ และผลกระทบที่มีต่อคุณภาพน้ำในแม่น้ำวัง

Abstract

According to the results of monitoring the quality of water from the pipe that drains into the Wang River during the flow through Lampang city. It was found that the highest value of Biochemical Oxygen Demand (BOD) of the sample water from the end of the pipe drain is the area of Thip Chang Road which is located behind LP High-tech Center company (Point L03). This point has a BOD value up to 7,970 mg/L. This is higher than 7 times comparing to the second highest BOD value at end of the pipe drain which has a BOD of 1,127 mg/L. Therefore, this research has been carried out to study the quantity and quality of effluent, i.e. the amount of effluent drained into the Wang River. Biochemical Oxygen Demand value (BOD), pH, temperature, and BOD loading at the end of sewerage drainage into the Wang River, as well as analyzing the impact of effluent volume at the point, whether they affect changes in the BOD values of the Wang River in this area, starting with monitoring, surveying the area to determine the sampling point, measuring the flow rate of the effluent. Collect samples of water drained from the end of the drainage pipe, and sample the water in the Wang River before and after contamination of the effluent from the pipe. The bod loading value was then calculated to analyze the relationship between bod loading from the end of the pipe and the BOD value in the Wang River, as well as to collect secondary data. Information data and field surveys to estimate BOD loading from the coefficient of quantity and impurity of wastewater from the water source to review the bod values obtained from the calculations by measuring the flow rate of effluent from the end of the drain. The flow monitoring at the end of sewage pipes shows that the average flow rate is 3,150 liters/day. As a result of three Biochemical Oxygen Demand (BOD) analysis are 1,430 mg/l, 1,095 mg/l and 973 mg/l respectively. The bod loading value from the amount of effluent and the results of Biochemical Oxygen Demand (BOD) of the sample were averaged 3.59 kg/day or approximately 1.31 tons/year, and the results of the analysis of the relationship between the BOD loading of effluent from the end of the drain affecting the organic impurity value (BOD) in the Wang River. It found that effluent from the pipe drain resulted in an average 47 percent rise in BOD values in the Wang River.