200837341 九、發明說明： 【發明所屬之技術領域】 本發明係與廢水處理技術領域有關，更詳而^ 是指一種監測廢水中懸浮微粒粒徑分佈之系統與方去 者。 、 / 【先前技術】 按，自來水及廢水處理程序中，沉澱/沉降程序 (sedimentation process)是不可或缺之程序之— 論是自來水中化學混凝或廢水生物處理程序，最終 都均需以重力沉殿方式進行固液分離，使液體與固體 充分地分離。通常沉澱效果易受到顆粒沉降性的影 響，而顆粒沉降性與顆粒之粒徑大小有相當大的關 係’ -般存在於液體中之懸浮顆纟，其沉降速度受到 牛頓運動定律之影響，顆粒之結構與大小將決定縣浮 顆粒於水體中的沉降效果。因此，水+顆粒之粒徑分 佈常是評估沉澱之固液分離之重要指標之一。 習知運用於分析懸浮顆粒粒捏分佈之方式有利用 聲裂法分析顆粒大小、透射式電子顯微鏡、雷射掃描 共焦式顯微鏡和不規則尺寸分析及f射粒徑分析儀等 方式’其中最常用之方式為雷射粒徑分析儀。 以上幾種方法大致有以下幾個缺點；⑴、現有懸 浮顆粒之粒好析方料易或無法提供作為連續線上 6 200837341 監測（on-llne m〇nit〇ring)用：沉澱池之顆粒粒徑、 比重等特性隨前—個程序（生物曝氣池或快慢混池等） 而改變，監測粒徑之分佈將可了解並協助此程序之控 制（如控制SRT或加藥量或快/慢混條件），也可以協 助沉澱池之控制（如溢流率或停留時間）；（2)、現有 懸浮顆粒之粒徑分析設備大都相當昂貴：以最常用雷 射粒徑分析儀而言，動概百萬之價格，無法廣泛實用 於般的自來水或污水處理廠，相當程度地降低其應 =之饧值，（3)、部分現有懸浮顆粒之粒徑分析設備在 里測粒徑範圍上有所限制：以最常用雷射粒徑分析儀 而言·’較大粒徑之顆粒常會堵塞管徑，使設備之維護 不易，（4)雷射粒徑分析儀無法提供顆粒形態學 (Morphology)上之參數特性，包含顆粒面積、直徑、 離心率與形㈣子m提供顆粒沉降特性。 ^此外，亦有利用顯微鏡（micr〇scope)與影像擷取 設備（如CCD)操取廢水中懸浮顆粒之影像以進行影 1象刀析之粒徑分析方法，此方法對顆粒形狀測量來 說’比傳統測量方法來得便利且提供更多有關顆粒形 狀的訊息’不過仍有其缺點，如：（1)、一般採穿透式 ^源’易造成影像中顆粒判斷之干擾；⑵、一般顯微 兄可提供之放大倍率有限，無法適用於量測大範圍之 顆粒粒徑’（3)、若需要連續監測，必須要修改目標物 之觀測臺，頗不方便。 200837341 【發明内容】 本發明之主要目的即在提供一種可解決前揭缺失 之監測廢水中懸浮微粒粒徑分佈之系統與方法，其整 體設備簡單、便宜，可線上（on-line)連續分析水中懸 浮顆粒之粒徑分佈，俾作為協助評估沉澱池之沉澱效 益之重要資訊，並可進一步回饋作為混凝沉澱加藥與 操作之控制及生物處理單元之控制用，甚具實用價值 者。 緣是，為達成前述之目的，本發明係提供一種監 測廢水中懸浮微粒粒徑分佈之系統，包含有一監測 槽，用以容納適量之廢水；一數位影像擷取裝置，對 應該監測槽，用以可擷取該監測槽内廢水中懸浮微粒 之數位影像；一光源，對應該監測槽内數位影像擷取 裝置之影像擷取位置；一控制單元，連接該數位影像 擷取裝置與光源，用以可控制該數位影像擷取裝置擷 、 取數位影像之動作，並可將懸浮微粒之數位影像進行 辨識分析，以監測廢水中懸浮微粒之粒徑分佈，並進 一步提供資訊以瞭解懸浮微粒之沉降效果。 此外，本發明更提供一種利用前述系統以監測廢 水中懸浮微粒粒徑分佈之方法，包含以下步驟：取適 量待測液體：將適量之廢水輸入該監測槽；擷取數位 影像：該監測槽容納適量之廢水後，該控制單元即啟 動數位影像擷取裝置，用以擷取廢水中隨著時間變化 8 200837341 而產生不同懸浮微粒之I/ 利用兮㈣…幻像；及粒徑分佈分析： 利用該控制早兀分析梅取之懸浮微粒數位影像之粒捏 分佈情形。 【實施方式】 以下μ舉本發明若干較佳實施例，並配合圖式 做進一步之詳細說明如後： 本發明係提供監測廢水中懸浮微粒粒徑分佈之系 統與方法’可作為監測廢水中懸浮微粒之粒徑分佈的 種自動皿；ijH主要是藉由數位影像處理技術榻 取廢水中料難影像並進㈣識分析，以監測廢水 中懸浮微粒之粒徑分佈’並希望進—步藉由資訊分析 懸浮微粒之沉降效果，將來可作為確保符合放流水標 準外，並可有效即時調整操作條件及加藥量，以提高 處理效率及降低處理成本之參考。 如圖一所示，本發明一較佳實施例監測廢水中懸 浮微粒粒徑分佈之之系統10係由一監測槽12、一數 位影像擷取裝置14、一光源16及一控制單元18所組 成。 該監測槽12,係可供廢水流入及流出並容納適量 之廢水。 該數位影像擷取裝置14，設置於該監測槽12上 方’係數位攝影機，用以可擷取該監測槽丨2内廢水中 9 200837341 懸浮微粒之數位影像。 該光源16，係設置於該數位影像擷取裝置η 一 侧而對應監測槽12 β ’用以提供該數位影像摘取裝置 14之影像擷取位置之光線。 & 該控制單元18，連接該數位影像擷取裝置“與 光源16,包含一電腦與設於電腦之影像處理分析軟、 體，係可控制該數位影像擷取裝置14擷取數位影像之 動作，並可將！浮微粒之數位影像進行辨識分析與運 算處理，以監測廢水中懸浮微粒之粒徑分佈，並進一 步提供資訊以瞭解懸浮微粒之沉降效果。該影像處理 分析軟體係ΝΙ Vision Assistant軟體。 此外，更包含有一抽水馬達19，係電性連接該控 制單元16,用以可受該控制單元16控制作動而將廢 水輸入監測槽12。 藉此，如圖二及圖三所示，本發明一較佳實施例 監測廢水中懸浮微粒粒徑分佈之方法丨0 0係利用該系 統10來實施，其步驟如下： 取適量待測液體110 :先將適量之廢水輸入該監 測槽12。 擷取數位影像120 :當該監測槽12容納適量之廢 水後，該控制單元18即啟動數位影像擷取裝置丨4 (可 於釭測槽12内設置連接控制單元18之水位感測裝置 方式為之）’用以擷取廢水中隨著時間變化而產生不 200837341 同懸浮微粒之數位影像。擷取之影像係彩色數位影 像，解析度為1024x768。 粒徑分佈分析130 :利用該控制單元18之影像處 理分析軟體分析擷取之懸浮微粒數位影像之粒徑分佈 情形，其中分析粒徑分佈之步驟如下： 前處理132 :將擷取之彩色數位影像轉換為灰階 影像。 影像強化133 :係利用顏色對照表（Lookup Table)、捲積運算（Convolution)及中間值濾波處 理等方式進行影像強化處理、消除影像雜訊。 選取適當閥值134 :由於本發明所針對之樣品為 液體狀的，易造成影像背景的不均勻光場，故無法以 一個特定的閥值（Threshold)來處理這類二值化影像 的問題，故採用動態二值化臨界點（Entropy)的遮罩運 算方式處理。 影像分割135 :再將影像二值化處理。 影像區分136 :利用Proper Open處理、分割顆 粒及移除較小顆粒等方式進行影像區分處理。 特徵擷取137 :利用粒子（Particle)輪廓擷取、 數量及面積計算等方式進行特徵擷取影像顆粒輪廓擷 取及數量、面積計算。 後處理138:影像資料輸出而儲存於控制單元18。 處理後呈現的影像顆粒面積係以像素（Pixels) 11 200837341 表不’先將lPixels轉換成多少# m2。在pixels換算 為//m2上，利用游標卡尺拍攝橫軸為i〇24pixels和 縱軸為768Pixels之影像，並分別記錄游標卡尺上之 實際長度，將每Pixel之面積換算出： lPixels=2· 6// mx2· 6//m =6.76//m2，若放大倍率不 同’亦可由倍率直接換算出每一 Pixel之面積。 藉此’本發明監測廢水中懸浮微粒粒徑分佈之方 ， 法可用以下實例說明： 首先，利用染整業之調勻池廢水以瓶杯試驗（ Test)方式進行Fent〇n實驗，以變化不同加藥量產生 不同顆粒特性與數量，採集混凝沉澱後所取得之上層 =同4進打本發明方法與習知雷射粒徑分析儀之測 疋，如圖四與圖五所示，係ss濃度i丨5· 4呢几，分 ㈣取100張與40張影像進行辨識分析。由二圖可得 t，本發明方法與雷射粒徑分析儀所測得之結果趨勢 非常類似，兩種分析方法所測得之粒徑分佈主要為1〇 3心。耗兩種分析方法於數量上並不同，此主 :疋I:粒挂分析儀所量測之粒徑分佈為所有之顆 二ΓΓ月只取其中一部份之平面，因此需顧取多 ί而Γ應可測得與雷射粒徑分析儀相同之粒徑分 佈而由圖六可得知，盔A 3 4 刀 張影像所得到的粒徑分：是完全°= 12 200837341 需拍攝4〇張影像即可得到具代 用二:為瞭解本發明所提供之系統與方法是否適 #水及’另選取河川水、家庭污水、染整孝 廢水及基本化學業之放流水，以分業 =:r，探討雷射粒好析儀與二二影 否同樣=業之樣品時’兩種分析方法之結果是 圖七為河川水ss濃度164·5 mg/L，由圖可知， *明方法所測得之結果趨勢與雷射粒徑 得之趨勢非常吻合， 1儀所挪 佈主要為1。〜一。 法所測得之㈣分 圖八為家庭污水SS濃度3l 3mg/L，由圖可得知 得之結果趨勢亦與雷射粒徑分析儀所 : 非㊉吻合，且兩種分析方法所測得之粒徑 分佈主要為10〜I00ym。 圖九為染整業廢水ss濃度25 5mg/L，同樣顯示 發明方法所測得之結果趨勢亦與雷射粒徑 :得之趨勢”吻合，兩種分析方法所測得之粒t 佈主要為10〜80 # m。 圖十為基本化學t ss濃度47 5mg/L，亦顯示本 :明方法所測得之結果趨勢亦與雷射粒徑分析儀所測 于之趨勢非常吻合，兩種分析方法所測得之粒徑分佈 主要為10〜80/Z m。 13 200837341 由以上河川水、家庭污水、染整業廢水及基本化 學業之放流水結果得知，不論ss濃度的高低，本發明 方法皆可測得與雷射粒徑分析儀相同之粒徑分佈。換 言之，本發明方法可有效辨識水中顆粒，並經運算分 析後可量測其粒徑之主要分佈狀況。 由上可知，本發明係一種比現行廢水懸浮微粒粒 控分析技術更簡便與更便宜之技術，且可大幅增加粒 徑分析於相關處理程序之監控上之實用性，以提高相 關程序之效率與穩定度。除此之外，對將來處理後之 廢水不同之處置方式（排放或回收再利用）均可有效 達到監測目標。 【圖式簡單說明】 圖一係本發明一較佳實施例之系統示意圖。 圖二係本發明一較佳實施例之方法流程圖。 圖三係本發明一較佳實施例方法中粒徑分佈分析 步驟之流程圖。 圖四係本發明一較佳實施例與習知雷射粒徑分析 儀之刀析方法數量分佈比較圖（分析張影像）。 圖係、本發明一較佳實施例與習知雷射粒徑分析 、之刀=方法數里分佈比較圖（分析^⑽張影像）。 圖，、係本發明一較佳實施例與習知雷射粒徑分析 儀之影像分析4G張與⑽張之數量㈣比較圖。 200837341 圖七係本發明一較佳實施例與習知雷射粒徑分析 儀對河川水之影像分析數量分佈比較圖。 圖八係本發明一較佳實施例與習知雷射粒徑分析 儀對家庭污水之影像分析數量分佈比較圖。 0九係本發明一較佳實施例與習知雷射粒徑分析 儀對染整業廢水之影像分析數量分佈比較圖。 圖十係本發明一較佳實施例之與習知雷射粒徑分 斤儀對基本化學業之影像分析數量分佈比較圖。 【主要元件符號說明】 系統10 監測槽12數位影像擷取裝置14 光源16 方法100 擷取數位影像 影像強化133 影像區分136 控制單元18 抽水馬達19 取適量待測液體110 120粒徑分佈分析13〇前處理I” 選取適當閥值134影像分割135 特徵擷取137 後處理138 15200837341 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to the field of wastewater treatment technology, and more particularly to a system and a method for monitoring the particle size distribution of suspended particles in wastewater. / / [Prior Art] According to the tap water and wastewater treatment process, the sedimentation process is an indispensable procedure - the process of chemical coagulation or wastewater biological treatment in tap water, ultimately requiring gravity The solid-liquid separation is carried out in a sinking manner to sufficiently separate the liquid from the solid. Usually, the sedimentation effect is easily affected by the sedimentation of the particles, and the sedimentation of the particles has a considerable relationship with the particle size of the particles. - The suspended particles are present in the liquid, and the sedimentation velocity is affected by Newton's law of motion. The structure and size will determine the sedimentation effect of the county floating particles in the water. Therefore, the particle size distribution of water + particles is often one of the important indicators for evaluating the solid-liquid separation of precipitation. The method used to analyze the pinch distribution of suspended particles is to use particle splitting method to analyze particle size, transmission electron microscope, laser scanning confocal microscope and irregular size analysis and f-particle size analyzer. A commonly used method is a laser particle size analyzer. The above several methods generally have the following shortcomings; (1), the existing particles of the suspended particles are easy to be or can not be provided as a continuous line 6 200837341 monitoring (on-llne m〇nit〇ring): particle size of the sedimentation tank, The characteristics such as specific gravity change with the previous procedure (biological aeration tank or fast mixing tank, etc.). Monitoring the distribution of particle size will understand and assist the control of this procedure (such as controlling SRT or dosing or fast/slow mixing conditions). ), can also assist in the control of the sedimentation tank (such as overflow rate or residence time); (2), the existing particle size analysis equipment for suspended particles is mostly quite expensive: in the most common laser particle size analyzer, The price cannot be widely applied to the tap water or sewage treatment plant, and the value of the granules should be reduced to a considerable extent. (3) The particle size analysis equipment of some existing suspended particles has a limitation on the range of the measured particle size: In the most commonly used laser particle size analyzers, 'larger particle size often blocks the pipe diameter, making the maintenance of the equipment difficult. (4) The laser particle size analyzer cannot provide parameters on the Morphology. special , The area comprising the particle diameter, shape and the eccentricity (iv) to provide the sub-m particle settling characteristics. In addition, there is also a microscopic (micr〇scope) and image capturing device (such as CCD) to take images of suspended particles in wastewater for particle size analysis. This method is used for particle shape measurement. 'It is more convenient than traditional measurement methods and provides more information about the shape of the particles', but it still has its shortcomings, such as: (1), generally adopting the penetration type ^ source's easy to cause interference in the judgment of particles in the image; (2), general display Micro-brothers can provide a limited magnification, which cannot be applied to the measurement of a wide range of particle sizes' (3). If continuous monitoring is required, it is inconvenient to modify the observation platform of the target. 200837341 SUMMARY OF THE INVENTION The main object of the present invention is to provide a system and method for solving the particle size distribution of suspended particles in the monitoring waste water, which is simple and inexpensive, and can be continuously analyzed on-line. The particle size distribution of suspended particles, as an important information to help evaluate the sedimentation efficiency of the sedimentation tank, can be further feedback as control of the coagulation and sedimentation dosing and operation control and biological control unit, which is of great practical value. In order to achieve the foregoing objectives, the present invention provides a system for monitoring the particle size distribution of suspended particles in wastewater, comprising a monitoring tank for accommodating an appropriate amount of wastewater; a digital image capturing device corresponding to the monitoring tank, a digital image of the suspended particles in the wastewater in the monitoring tank; a light source corresponding to the image capturing position of the digital image capturing device in the tank; and a control unit connecting the digital image capturing device and the light source The digital image capturing device can be controlled to take digital images, and the digital image of the suspended particles can be identified and analyzed to monitor the particle size distribution of the suspended particles in the wastewater, and further provide information to understand the sedimentation of the suspended particles. effect. In addition, the present invention further provides a method for monitoring the particle size distribution of suspended particles in wastewater by using the foregoing system, comprising the steps of: taking an appropriate amount of liquid to be tested: inputting an appropriate amount of wastewater into the monitoring tank; capturing a digital image: the monitoring tank is accommodated After an appropriate amount of wastewater, the control unit activates a digital image capture device for extracting I/utilization of different aerosols in the wastewater as a function of time 8 200837341; phantom image; and particle size distribution analysis: Control the analysis of the grain pinch distribution of the digital image of the suspended particles of the plum. [Embodiment] The following are a few preferred embodiments of the present invention, and further detailed description with reference to the following figures: The present invention provides a system and method for monitoring the particle size distribution of suspended particles in wastewater, which can be used as a monitoring suspension in wastewater. The automatic particle size distribution of the particle size; ijH is mainly through the digital image processing technology, the difficult image of the waste water in the wastewater is taken in (4) to monitor the particle size distribution of the suspended particles in the wastewater, and it is hoped to further The analysis of the sedimentation effect of suspended particles can be used as a reference to ensure that the discharge water standard is met, and the operating conditions and dosage can be adjusted in real time to improve the treatment efficiency and reduce the treatment cost. As shown in FIG. 1, a system 10 for monitoring the particle size distribution of suspended particles in wastewater is composed of a monitoring tank 12, a digital image capturing device 14, a light source 16, and a control unit 18. . The monitoring tank 12 is for allowing wastewater to flow in and out and to accommodate an appropriate amount of wastewater. The digital image capturing device 14 is disposed on the monitoring unit 12 above the coefficient camera for capturing the digital image of the suspended particles in the wastewater in the monitoring tank 2. The light source 16 is disposed on the side of the digital image capturing device η and corresponding to the monitoring slot 12 β ′ for providing light of the image capturing position of the digital image capturing device 14 . The control unit 18 is connected to the digital image capturing device "and the light source 16 and includes a computer and a computer-processed image processing analysis software and body, and can control the digital image capturing device 14 to capture digital images. The digital image of the floating particle can be identified, analyzed and processed to monitor the particle size distribution of the suspended particles in the wastewater, and further provide information to understand the sedimentation effect of the suspended particles. The image processing analysis software system Vision Assistant software In addition, a pumping motor 19 is further included, which is electrically connected to the control unit 16 for being controlled by the control unit 16 to input waste water into the monitoring tank 12. Thereby, as shown in FIG. 2 and FIG. DETAILED DESCRIPTION OF THE INVENTION A preferred embodiment of the method for monitoring the particle size distribution of suspended particles in wastewater is carried out using the system 10, the steps of which are as follows: Take an appropriate amount of liquid to be tested 110: First, an appropriate amount of wastewater is first introduced into the monitoring tank 12. Taking the digital image 120: When the monitoring tank 12 contains an appropriate amount of waste water, the control unit 18 activates the digital image capturing device 丨4 (can be set in the detecting tank 12) The water level sensing device connected to the control unit 18 is used to extract digital images of the same suspended particles in the wastewater as a function of time. The captured image is a color digital image with a resolution of 1024 x 768. The diameter distribution analysis 130: using the image processing analysis software of the control unit 18 to analyze the particle size distribution of the suspended particle digital image, wherein the steps of analyzing the particle size distribution are as follows: Pre-processing 132: Converting the captured digital digital image Grayscale image. Image enhancement 133: Image enhancement processing and image noise reduction using a lookup table, convolution, and median filtering. Select the appropriate threshold 134: due to this The sample for the invention is liquid, which is easy to cause uneven light field of the image background, so it is impossible to deal with the problem of such binarized image with a specific threshold (Threshold), so the dynamic binarization critical point is adopted. (Entropy) mask operation method. Image segmentation 135: Image binarization processing again. Image segmentation 136: Using Prope r Open processing, segmentation of particles and removal of smaller particles for image differentiation processing. Feature extraction 137: Using particle contour extraction, quantity and area calculation, etc. Post-processing 138: The image data is output and stored in the control unit 18. The image particle area presented after processing is in pixels (Pixels) 11 200837341, which indicates 'how to convert lPixels to how much # m2. In pixels converted to / On /m2, use the vernier caliper to take images with i横24pixels on the horizontal axis and 768Pixels on the vertical axis, and record the actual length on the vernier caliper separately, and convert the area of each Pixel: lPixels=2· 6// mx2· 6// m = 6.76//m2, if the magnification is different', the area of each Pixel can also be directly converted by the magnification. By the method of the present invention for monitoring the particle size distribution of suspended particles in the wastewater, the method can be illustrated by the following examples: First, the Fent〇n experiment is carried out by using the test tube method in the dyeing and finishing industry, and the variation is different. The amount of the drug produces different particle characteristics and quantity, and the upper layer obtained after collecting the coagulation and sedimentation is the same as the method of the present invention and the conventional laser particle size analyzer, as shown in FIG. 4 and FIG. The concentration i丨5·4 is a few, and (4) 100 and 40 images are taken for identification analysis. From the two figures, t, the method of the invention is very similar to the trend measured by the laser particle size analyzer. The particle size distribution measured by the two methods is mainly 1 〇 3 hearts. The two analytical methods are different in quantity. The main: 疋I: The particle size distribution measured by the particle hang analyzer is the plane where only one part of the granules is taken in two months, so it is necessary to take more The 粒径 should be able to measure the same particle size distribution as the laser particle size analyzer. It can be seen from Fig. 6 that the particle size of the helmet A 3 4 knife image is: °° 12 200837341 4 shots required The image can be obtained by substituting two: in order to understand whether the system and method provided by the invention are suitable for water and water, household sewage, dyeing and finishing wastewater, and the discharge water of the basic chemical industry, The results of the two analytical methods are as follows: Figure 7 shows the concentration of river water ss 164·5 mg/L. The resulting trend is very consistent with the trend of the laser particle size. ~One. According to the law, (4) is divided into Figure 8. The SS concentration of domestic sewage is 3l 3mg/L. The results obtained from the figure are also consistent with the laser particle size analyzer: non-six, and measured by two analytical methods. The particle size distribution is mainly 10 to 100 μm. Figure 9 shows the ss concentration of wastewater 5 25 mg/L in the dyeing and finishing industry. It also shows that the trend of the results measured by the invention method is also consistent with the trend of the laser particle size: the obtained grain t cloth is mainly measured by the two analytical methods. 10~80 # m. Figure 10 shows the basic chemical t ss concentration of 47 5mg/L. It also shows that the trend of the measured results of the Ming method is also very consistent with the trend measured by the laser particle size analyzer. The particle size distribution measured by the method is mainly 10~80/Z m. 13 200837341 It is known from the above river water, domestic sewage, dyeing and finishing wastewater and the discharge water of the basic chemical industry, regardless of the concentration of ss, the present invention The method can measure the same particle size distribution as the laser particle size analyzer. In other words, the method of the invention can effectively identify the particles in the water, and can measure the main distribution of the particle size after calculation and analysis. The invention is a simpler and cheaper technology than the current granular control analysis technology for wastewater suspended particles, and can greatly increase the practicality of particle size analysis in monitoring related processing procedures to improve the efficiency and stability of related procedures. Outside The different treatment modes (emission or recycling) of the treated wastewater in the future can effectively achieve the monitoring target. [Simplified Schematic] FIG. 1 is a schematic diagram of a system according to a preferred embodiment of the present invention. The flow chart of the method of the preferred embodiment. Figure 3 is a flow chart of the particle size distribution analysis step in the method of the preferred embodiment of the present invention. Figure 4 is a preferred embodiment of the present invention and a conventional laser particle size analyzer. Knife analysis method quantity distribution comparison chart (analytical sheet image) Figure, a preferred embodiment of the present invention and conventional laser particle size analysis, knife = method number distribution comparison chart (analysis ^ (10) image). The image analysis of a preferred embodiment of the present invention and a conventional laser particle size analyzer for comparing the number of 4G sheets and (10) sheets (4). Figure 7 is a preferred embodiment of the present invention and conventional laser particles. A comparison chart of the number distribution analysis of the image analysis of the river water by the diameter analyzer. Fig. 8 is a comparison diagram of the quantitative analysis of the image analysis of the domestic sewage according to a preferred embodiment of the present invention and a conventional laser particle size analyzer. More FIG. 10 is a comparison diagram of the image analysis of the dyeing and finishing wastewater according to a conventional laser particle size analyzer. FIG. 10 is a comparison between a preferred embodiment of the present invention and a conventional laser particle size analyzer for the basic chemical industry. Image analysis quantity distribution comparison chart [Main component symbol description] System 10 Monitoring slot 12 Digital image capture device 14 Light source 16 Method 100 Capture digital image enhancement 133 Image discrimination 136 Control unit 18 Pump motor 19 Take appropriate amount of liquid to be tested 110 120 particle size distribution analysis 13〇Pre-treatment I” Select appropriate threshold 134 image segmentation 135 Feature extraction 137 Post-processing 138 15